Editing Diamond Bar, California

{{Use mdy dates|date=May 2024}}
{{Infobox settlement
| name                            = Diamond Bar, California
| settlement_type                 = [[List of municipalities in California|City]]
| nickname                        = 
| motto                           = 
| image_skyline                   = Diamond_Bar_City_Hills.jpg
| image_caption                   = A residential area among the hills of Diamond Bar City
| image_flag                      = Flag of Diamond Bar, California.gif
| flag_size                       = 
| image_seal                      = Diamond bar ca seal.png
| seal_size                       = 
| image_blank_emblem              = Diamond bar ca logo.png
| blank_emblem_type               = Logo
| image_map                       = File:Los Angeles County California Incorporated and Unincorporated areas Diamond Bar Highlighted 0619192.svg
| map_caption                     = Location of Diamond Bar in Los Angeles County, California
| pushpin_map                     = USA
| pushpin_map_caption             = Location in the United States
| pushpin_relief                  = 1
| subdivision_type                = [[List of sovereign states|Country]]
| subdivision_name                = {{Flagu|United States|size=23px}}
| subdivision_type1               = [[U.S. state|State]]
| subdivision_name1               = {{Flag|California|size=23px}}
| subdivision_type2               = [[List of counties in California|County]]
| subdivision_name2               = [[Los Angeles County, California|Los Angeles]]
| government_type                 = 
| leader_title                    = [[Mayor]]
| leader_name                     = Stan Liu<ref name=cc>{{Cite web
 | url = https://www.diamondbarca.gov/908/Mayor-Stan-Liu
 | title = Council Members
 | publisher = City of Diamond Bar
 | access-date = December 16, 2014
| archive-url = https://web.archive.org/web/20150206032017/http://cityofdiamondbar.com/index.aspx?page=281
 | archive-date = February 6, 2015
| url-status = dead
 }}</ref>
| leader_title1                   = [[Mayor Pro Tem]]
| leader_name1                    = Chia Yu Teng
| leader_title2                   = [[City Council]]
| leader_name2                    = Andrew Chou <br> Ruth M. Low <br> Steve Tye
| established_title               = <!-- Founded -->
| established_date                = 
| established_title3              = [[Municipal corporation|Incorporated]]
| established_date3               = April 18, 1989<ref>{{Cite web
 |url=http://www.calafco.org/docs/Cities_by_incorp_date.doc
 |title=California Cities by Incorporation Date
 |format=Word
 |publisher=California Association of [[Local Agency Formation Commission]]s
 |access-date=August 25, 2014 |url-status=dead
 |archive-url=https://web.archive.org/web/20141103002921/http://www.calafco.org/docs/Cities_by_incorp_date.doc
 |archive-date=November 3, 2014 }}</ref>
<!-- Area------------------>
| unit_pref                       = Imperial
| area_footnotes                  = <ref name="CenPopGazetteer2020">{{cite web|title=2020 U.S. Gazetteer Files|url=https://www2.census.gov/geo/docs/maps-data/data/gazetteer/2020_Gazetteer/2020_gaz_place_06.txt|publisher=United States Census Bureau|accessdate=October 30, 2021}}</ref>
| area_total_sq_mi                = 14.88
| area_land_sq_mi                 = 14.87
| area_water_sq_mi                = 0.01
| area_total_km2                  = 38.53
| area_land_km2                   = 38.51
| area_water_km2                  = 0.01
| area_water_percent              = 0.04
| area_metro_sq_mi                = <!-- Elevation ------------>
| elevation_footnotes             = <ref>{{Cite GNIS|1660549|Diamond Bar|access-date=February 26, 2015}}</ref>
| elevation_ft                    = 696
| elevation_m                     = 212
<!-- Population ----------->
| population_as_of                = [[2020 United States census|2020]]
| population_footnotes            = 
| population_total                = 55072
| pop_est_as_of                   = 
| pop_est_footnotes               = 
| population_est                  = 
| population_density_sq_mi        = 3703.56
| population_density_km2          = 1429.91
| population_metro                = 
| population_density_metro_sq_mi  = <!-- Time zones ----------->
| timezone                        = [[Pacific Time Zone|Pacific]]
| utc_offset                      = −8
| timezone_DST                    = [[Pacific Daylight Time|PDT]]
| utc_offset_DST                  = −7
| coordinates                     = {{Coord|34|0|6|N|117|49|15|W|region:US-CA_type:city(55,000)|display=inline,title}}
| postal_code_type                = [[ZIP Code]]s
| postal_code                     = 91765,<ref>{{cite web | url = http://zip4.usps.com/zip4/zcl_1_results.jsp?visited=1&pagenumber=0&state=ca&city=Diamond%20Bar | title = USPS – ZIP Code Lookup – Find a ZIP+ 4 Code By City Results | access-date = January 18, 2007}}</ref> 91789 (91789 is shared with [[Walnut, CA]])
| area_code_type                  = [[North American Numbering Plan|Area code]]<ref>{{cite web | url = http://www.nanpa.com/nas/public/npa_city_query_step2.do?method=displayData&cityToNpaModel.stateAbbr=CA&cityToNpaModel.city=Diamond%20Bar | title = Number Administration System – NPA and City/Town Search Results | access-date = January 18, 2007 | archive-url = https://web.archive.org/web/20070926212527/http://www.nanpa.com/nas/public/npa_city_query_step2.do?method=displayData&cityToNpaModel.stateAbbr=CA&cityToNpaModel.city=Diamond%20Bar | archive-date = September 26, 2007 | url-status = dead }}</ref>
| area_code                       = [[Area code 909|909]]
| blank_name                      = [[Federal Information Processing Standards|FIPS]] code
| blank_info                      = {{FIPS|06|19192}}
| blank1_name                     = [[Geographic Names Information System|GNIS]] feature IDs
| blank1_info                     = {{GNIS 4|1660549}}, {{GNIS 4|2410334}}
| named_for                       = Diamond Bar Ranch
| website                         = {{URL|https://www.diamondbarca.gov/}}
}}

'''Diamond Bar''' is a city in eastern [[Los Angeles County, California|Los Angeles County]], [[California]], United States.<ref name="http://www.diamondbarcountry.com/">{{cite web|url=http://www.diamondbarcountry.com|title=Diamond Bar Country |publisher=diamonbarcountry.com|access-date=July 31, 2015}}</ref> The [[2020 United States census|2020 census]] listed a population of 55,072.<ref>{{Cite web |title= Diamond Bar city, California  |website=[[United States Census Bureau]]|date= |url=https://data.census.gov/profile/Diamond_Bar_city,_California?g=160XX00US0619192 |access-date=August 5, 2024}}</ref> It is one of a few [[List of U.S. communities with Asian-American majority populations|cities in California with a majority Asian population]] (59.24% as of 2020).<ref name=2020CensusP2/> It is named after the "diamond over a bar" branding iron registered in 1918 by ranch owner Frederic E. Lewis (1884–1963). The city features a public Los Angeles County golf course.

Located at the junction of the [[California State Route 60|Pomona]] and [[California State Route 57|Orange]] freeways, Diamond Bar is primarily residential with shopping centers interspersed throughout the city. It is surrounded by the cities of [[Brea, California|Brea]], [[Walnut, California|Walnut]], [[Chino Hills, California|Chino Hills]], [[Pomona, California|Pomona]], [[City of Industry, California|City of Industry]], and the [[unincorporated area]]s of [[Rowland Heights, California|Rowland Heights]] and
[[South Diamond Bar, California|South Diamond Bar]].<ref>{{Cite web |url=https://www.google.com/maps/place/Diamond+Bar,+CA?dg=dbrw&newdg=1 |title=Google Maps|publisher=Google Maps |access-date=January 26, 2017}}</ref>

Northern Diamond Bar is a part of the Pomona Unified School District.<ref>{{Cite news |url=http://edline.pusd.org/pages/PUSD|archive-url=https://archive.today/20150128224505/http://edline.pusd.org/pages/PUSD |url-status=dead|archive-date=January 28, 2015 |title=Pomona Unified |newspaper=Edline |language=en|access-date=January 26, 2017}}</ref> Southern Diamond Bar is a part of the Walnut Valley Unified School District.<ref name="nerdwallet.com">{{cite web |url=https://www.nerdwallet.com/blog/cities/best-school-districts-southern-california-2015/|title=Best School Districts for Your Buck in Southern California |publisher=NerdWallet|access-date=July 31, 2015|archive-date=July 27, 2015 |archive-url=https://web.archive.org/web/20150727230639/https://www.nerdwallet.com/blog/cities/best-school-districts-southern-california-2015/|url-status=dead}}</ref> The city is also served by International Polytechnic High School.<ref>{{cite web|url=http://www.ipolyhighschool.org/default.aspx|title=iPoly High School / Homepage|website=www.ipolyhighschool.org}}</ref> It also has the first [[hydrogen station|hydrogen fueling station]] to be built in Southern California,<ref>{{cite press release
 |title       = AQMD Celebrates Grand Opening of the First Hydrogen Highway Network Fueling Station in Southern California
 |publisher   = South Coast Air Quality Management District
 |date        = August 13, 2004
|url         = http://www.aqmd.gov/news1/2004/HydrogenStationGrandOpeningPR.html
 |access-date  = May 10, 2008
 |url-status     = dead
 |archive-url  = https://web.archive.org/web/20080510170641/http://www.aqmd.gov/news1/2004/HydrogenStationGrandOpeningPR.html
 |archive-date = May 10, 2008
}}
</ref> near the [[South Coast Air Quality Management District]] building.

==History==
{{Unreferenced section|date=January 2025}}
In 1840, José de la Luz Linares received the {{convert|4340|acre|adj=on}} [[Ranchos of California|Mexican land grant]] [[Rancho Los Nogales]] (Ranch of the Walnut Trees) from Governor [[Juan Bautista Alvarado|Juan Alvarado]]. The land grant included Brea Canyon and the eastern [[Walnut Valley]]. Linares died in 1847, and his widow sold a part of the ranch to [[Ricardo Vejar]] for $100 in merchandise, 100 calves, and the assumption of her late husband's debts. Vejar also owned the [[Rancho San Jose (Palomares)|Rancho San Jose]] to the east, and acquired the rest of Rancho Nogales over the next 10 years.

However, Vejar's luck did not last that long. As time wore on – and particularly as the United States government took over California – Rancho Los Nogales was divided and sold into multiple land ranches, the largest of which was the Diamond Bar Ranch. At the time, it was one of the largest working cattle ranches in the western U.S. The entire Diamond Bar Ranch was acquired by the [[Transamerica Corporation]] in the 1950s for the purpose of developing one of the nation's first master-planned communities. Transamerica gave the Diamond Bar name to its new community and incorporated the ranch's familiar diamond and bar cattle brand into various logos (many of which are still in use today).

The first houses in this development were built in 1959, adjacent to the future location of the [[California State Route 60|Pomona Freeway]], which was built through the area ten years later. The town's development and population grew extremely quickly after that.

Transamerica oversaw all development of the community through the 1960s. The Transamerica Corporation divested itself of all its real estate ventures in the 1970s and 1980s. As a result, the Diamond Bar project was sold to multiple developers and much of its initial master plan was not implemented during the latter half of its development in the 1980s.

The City of Diamond Bar was incorporated on April 18, 1989.

==Geography==
Diamond Bar's main road, Diamond Bar Boulevard, runs along the bottom of the valley that eventually becomes [[Brea Canyon]], and housing developments overlook the boulevard on both sides from surrounding hills. The city lies roughly between the ends of the [[Chino Fault]] and the [[Whittier Fault]], both part of the [[Elsinore Fault Zone]].

Positioned in the southeastern corner of the [[San Gabriel Valley]] in eastern [[Los Angeles County, California|Los Angeles County]], Diamond Bar is approximately {{convert|27|mi}} east of [[Downtown Los Angeles]]. Neighboring communities include [[Walnut, California|Walnut]], [[Rowland Heights, California|Rowland Heights]], and [[Pomona, California|Pomona]]. Diamond Bar is also adjacent to the [[Inland Empire, California|Inland Empire]] region, with [[Chino Hills, California|Chino Hills]] directly to the east, and to the south of Diamond Bar lie the cities of [[Brea, California|Brea]] and [[La Habra, California|La Habra]] in [[Orange County, California|Orange County]].

According to the [[United States Census Bureau]], the city has a total area of {{convert|14.9|sqmi|km2}}, with no significant bodies of water.

Both [[California State Route 60|the CA-60 Freeway]] and [[California State Route 57|the CA-57 Freeway]] run through Diamond Bar. [[Interstate 10 in California|the I-10 Freeway]] is just north of the city and [[California State Route 71|CA-71]] is just east of the city. Major thoroughfares include Grand Avenue, Diamond Bar Boulevard, Pathfinder Road, Golden Springs Drive, and Brea Canyon Road.

===Climate===
{{Weather box|width=auto
|location = Diamond Bar, California
|single line = Y
|Jan record high F =  91
|Feb record high F =  94
|Mar record high F = 100
|Apr record high F = 104
|May record high F = 106
|Jun record high F = 106
|Jul record high F = 113
|Aug record high F = 109
|Sep record high F = 113
|Oct record high F = 107
|Nov record high F =  97
|Dec record high F =  93
|year record high F =113
|Jan high F = 67.5
|Feb high F = 68.8
|Mar high F = 70.8
|Apr high F = 76.2
|May high F = 79.1
|Jun high F = 84.3
|Jul high F = 90.4
|Aug high F = 92.3
|Sep high F = 89.4
|Oct high F = 80.4
|Nov high F = 73.7
|Dec high F = 67.1

|Jan low F = 40.8
|Feb low F = 45.8
|Mar low F = 46.7
|Apr low F = 50.2
|May low F = 53.7
|Jun low F = 58.2
|Jul low F = 62.2
|Aug low F = 63.1
|Sep low F = 61.4
|Oct low F = 55.4
|Nov low F = 46.6
|Dec low F = 39.7

|Jan record low F = 21
|Feb record low F = 23
|Mar record low F = 26
|Apr record low F = 29
|May record low F = 34
|Jun record low F = 39
|Jul record low F = 41
|Aug record low F = 43
|Sep record low F = 38
|Oct record low F = 29
|Nov record low F = 24
|Dec record low F = 22
|year record low F =21
|precipitation colour = green
|Jan precipitation inch = 3.11
|Feb precipitation inch = 4.76
|Mar precipitation inch = 2.63
|Apr precipitation inch = 1.20
|May precipitation inch = 0.23
|Jun precipitation inch = 0.09
|Jul precipitation inch = 0.00
|Aug precipitation inch = 0.03
|Sep precipitation inch = 0.15
|Oct precipitation inch = 1.05
|Nov precipitation inch = 1.62
|Dec precipitation inch = 2.45
|year precipitation inch=17.32
|source = <ref>
  {{cite web
  |url = https://weather.com/weather/monthly/l/2808e609dace27739859c72daeb0dee467d3ef5e5bb46a233bf0d66dc1903205
  |title = Diamond Bar, CA Monthly Weather
  |publisher = [[The Weather Channel]]
  |access-date = June 2, 2020}}</ref>
|date=August 2014}}

==Demographics==
{{US Census population
|1970= 10576
|1980= 28045
|1990= 53672
|2000= 56287
|2010= 55544
|2020= 55072
|align-fn=center
|footnote=U.S. Decennial Census<ref name="DecennialCensus">{{cite web|url=https://www.census.gov/programs-surveys/decennial-census/decade.html|title=Decennial Census by Decade|website=[[United States Census Bureau]]|access-date=}}</ref><br>1860–1870<ref name=1870CensusCA1>{{Cite web|title= 1870 Census of Population - Population of Civil Divisions less than Counties - California - Almeda County to Sutter County |url=https://www2.census.gov/library/publications/decennial/1870/population/1870a-12.pdf|website=[[United States Census Bureau]]}}</ref><ref name=1870CensusCA2>{{Cite web|title= 1870 Census of Population - Population of Civil Divisions less than Counties - California - Tehama County to Yuba County  |url=https://www2.census.gov/library/publications/decennial/1870/population/1870a-13.pdf|website=[[United States Census Bureau]]}}</ref> 1880-1890<ref name=1890CensusCA>{{Cite web|title= 1890 Census of Population - Population of California by Minor Civil Divisions |url=https://www2.census.gov/library/publications/decennial/1890/bulletins/demographics/134-population-of-ca.pdf|website=[[United States Census Bureau]]}}</ref><br> 1900<ref name=1900CensusCA>{{Cite web|title= 1900 Census of Population - Population of California by Counties and Minor Civil Divisions |url=https://www2.census.gov/library/publications/decennial/1900/bulletins/demographic/10-population-ca.pdf|website=[[United States Census Bureau]]}}</ref> 1910<ref name=1910CensusCA>{{Cite web|title= 1910 Census of Population - Supplement for California |url=https://www2.census.gov/library/publications/decennial/1910/abstract/supplement-ca.pdf|website=[[United States Census Bureau]]}}</ref> 1920<ref name=1920CensusCA>{{Cite web|title= 1920 Census of Population - Number of Inhabitants - California |url=https://www2.census.gov/library/publications/decennial/1920/bulletins/demographics/population-ca-number-of-inhabitants.pdf|website=[[United States Census Bureau]]}}</ref><br> 1930<ref name=1930CensusCA>{{Cite web|title= 1930 Census of Population - Number and Distribution of Inhabitants - California |url=https://www2.census.gov/library/publications/decennial/1930/population-volume-1/03815512v1ch03.pdf|website=[[United States Census Bureau]]}}</ref> 1940<ref name=1940CensusCA>{{Cite web|title= 1940 Census of Population - Number of Inhabitants - California |url=https://www2.census.gov/library/publications/decennial/1940/population-volume-1/33973538v1ch03.pdf|website=[[United States Census Bureau]]}}</ref> 1950<ref name=1950CensusCA>{{Cite web|title= 1950 Census of Population - Number of Inhabitants - California |url=https://www2.census.gov/library/publications/decennial/1950/population-volume-1/vol-01-08.pdf|website=[[United States Census Bureau]]}}</ref><br> 1960<ref name=1960CensusCA>{{Cite web|title= 1960 Census of Population - General population Characteristics - California |url=https://www2.census.gov/library/publications/decennial/1960/population-volume-1/vol-01-06-d.pdf|website=[[United States Census Bureau]]}}</ref> 1970<ref name=1970CensusCA>{{Cite web|title= 1970 Census of Population - Number of Inhabitants - California |url=https://www2.census.gov/prod2/decennial/documents/1970a_ca1-01.pdf|website=[[United States Census Bureau]]}}</ref> 1980<ref name=1980CensusCA>{{Cite web|title= 1980 Census of Population - Number of Inhabitants - California |url=https://www2.census.gov/prod2/decennial/documents/1980a_caAB-01.pdf|website=[[United States Census Bureau]]}}</ref><br> 1990<ref name=1990CensusCA>{{Cite web|title= 1990 Census of Population - Population and Housing Unit Counts - California |url=https://www2.census.gov/prod2/cen1990/cph2/cph-2-6.pdf|website=[[United States Census Bureau]]}}</ref>
2000<ref name=2000CensusCA>{{Cite web|title= 2000 Census of Population - Population and Housing Unit Counts - California |url=https://www2.census.gov/library/publications/2003/dec/phc-3-6.pdf|website=[[United States Census Bureau]]}}</ref> 2010<ref name=2010CensusCA>{{Cite web|title= 2010 Census of Population - Population and Housing Unit Counts - California |url=https://www2.census.gov/library/publications/decennial/2010/cph-2/cph-2-6.pdf|website=[[United States Census Bureau]]}}</ref><br> 2020<ref name=2020CensusP2/>
}}

Diamond Bar first appeared as a city in the [[1970 U.S. Census]].<ref name=1970CensusCA/>

===2020 census===
{| class="wikitable" style="text-align:center;"
|+'''Diamond Bar city, California – Racial and ethnic composition'''<br><small>{{nobold|''Note: the US Census treats Hispanic/Latino as an ethnic category. This table excludes Latinos from the racial categories and assigns them to a separate category. Hispanics/Latinos may be of any race.''}}</small>
!Race / Ethnicity <small>(''NH = Non-Hispanic'')</small>
!Pop 2000<ref name=2000CensusP004>{{Cite web|title=P004: Hispanic or Latino, and Not Hispanic or Latino by Race – 2000: DEC Summary File 1 – Diamond Bar city, California |url=https://data.census.gov/table?g=160XX00US0619192&tid=DECENNIALSF12000.P004|publisher=[[United States Census Bureau]] |access-date= }}</ref>
!Pop 2010<ref name=2010CensusP2>{{Cite web|title=P2: Hispanic or Latino, and Not Hispanic or Latino by Race – 2010: DEC Redistricting Data (PL 94-171) – Diamond Bar city, California |url=https://data.census.gov/cedsci/table?q=p2&g=160XX00US0619192&tid=DECENNIALPL2010.P2|publisher=[[United States Census Bureau]] |access-date= }}</ref>
!{{partial|Pop 2020}}<ref name=2020CensusP2>{{Cite web|title=P2: Hispanic or Latino, and Not Hispanic or Latino by Race – 2020: DEC Redistricting Data (PL 94-171) – Diamond Bar city, California |url=https://data.census.gov/cedsci/table?q=p2&g=160XX00US0619192&tid=DECENNIALPL2020.P2|publisher=[[United States Census Bureau]] |access-date= }}</ref>
!% 2000
!% 2010
!{{partial|% 2020}}
|-
|[[Non-Hispanic or Latino whites|White]] alone (NH)
|17,471
|11,812
|style='background: #ffffe6; |8,117
|31.04%
|21.27%
|style='background: #ffffe6; |14.74%
|-
|[[Non-Hispanic or Latino African Americans|Black or African American]] alone (NH)
|2,624
|2,194
|style='background: #ffffe6; |1,717
|4.66%
|3.95%
|style='background: #ffffe6; |3.12%
|-
|[[Native Americans in the United States|Native American]] or [[Alaska Native]] alone (NH)
|98
|67
|style='background: #ffffe6; |56
|0.17%
|0.12%
|style='background: #ffffe6; |0.10%
|-
|[[Asian Americans|Asian]] alone (NH)
|23,922
|28,883
|style='background: #ffffe6; |32,626
|42.50%
|52.00%
|style='background: #ffffe6; |59.24%
|-
|[[Native Hawaiian]] or [[Pacific Islander Americans|Pacific Islander]] alone (NH)
|62
|92
|style='background: #ffffe6; |79
|0.11%
|0.17%
|style='background: #ffffe6; |0.14%
|-
|[[Race and ethnicity in the United States census|Other Race]] alone (NH)
|101
|93
|style='background: #ffffe6; |179
|0.18%
|0.17%
|style='background: #ffffe6; |0.33%
|-
|[[Multiracial Americans|Mixed race or Multiracial]] (NH)
|1,616
|1,265
|style='background: #ffffe6; |1,495
|2.87%
|2.28%
|style='background: #ffffe6; |2.71%
|-
|[[Hispanic and Latino Americans|Hispanic or Latino]] (any race)
|10,393
|11,138
|style='background: #ffffe6; |10,803
|18.46%
|20.05%
|style='background: #ffffe6; |19.62%
|-
|'''Total'''
|'''56,287'''
|'''55,544'''
|style='background: #ffffe6; |'''55,072'''
|'''100.00%'''
|'''100.00%'''
|style='background: #ffffe6; |'''100.00%'''
|}

The [[2020 United States census]] reported that Diamond Bar had a population of 55,072.<ref>{{cite web | title=Diamond Bar city, California | website=Census Bureau QuickFacts| url=https://www.census.gov/quickfacts/fact/table/diamondbarcitycalifornia/PST045222 | access-date=December 20, 2023}}</ref> The racial makeup of Diamond Bar was: Asian (61.0%); [[White Americans|White]] (23.3%); [[African Americans|Black or African American]] (4.0%); [[Hispanic and Latino Americans|Hispanics and Latinos]] of any origin made up 17.8% of the overall population.

The median household income in 2021 was $100,776, with 7.9% of the population living below the poverty line.<ref name="quickfacts.census.gov">{{cite web |title=Diamond Bar (city) QuickFacts |url=https://www.census.gov/quickfacts/diamondbarcitycalifornia |url-status=live |archive-url=https://web.archive.org/web/20150718013439/http://quickfacts.census.gov/qfd/states/06/0619192.html |archive-date=July 18, 2015 |access-date=June 22, 2023 |publisher=US Census Bureau}}</ref>

===2010===
The [[2010 United States census]]<ref>{{cite web|url=https://www.census.gov/2010census/popmap/ipmtext.php?fl=06:0619192|title=2010 Census Interactive Population Search: CA – Diamond Bar city|publisher=U.S. Census Bureau|access-date=July 12, 2014|archive-url=https://web.archive.org/web/20150923221710/http://www.census.gov/2010census/popmap/ipmtext.php?fl=06:0619192|archive-date=September 23, 2015|url-status=dead}}</ref> reported that Diamond Bar had a population of 55,544. The population density was {{convert|3,731.5|PD/sqmi|PD/km2|sp=us|adj=off}}. The racial makeup of Diamond Bar was: 29,144 (52.5%) [[Asian (U.S. Census)|Asian]]; 18,434 (33.2%) [[White (U.S. Census)|White]] (21.3% Non-Hispanic White),<ref name=quif>{{Cite web|url=http://quickfacts.census.gov/qfd/states/06/0619192.html|title=Diamond Bar (city) QuickFacts|publisher=[[United States Census Bureau]]|access-date=March 15, 2015|archive-url=https://web.archive.org/web/20150718013439/http://quickfacts.census.gov/qfd/states/06/0619192.html|archive-date=July 18, 2015|url-status=dead}}</ref> 2,288 (4.1%) [[African American (U.S. Census)|African American]]; 178 (0.3%) [[Native American (U.S. Census)|Native American]]; 106 (0.2%) [[Pacific Islander (U.S. Census)|Pacific Islander]]; 3,237 (5.8%) from [[Race (United States census)|other races]]; and 2,157 (3.9%) from two or more races. There were 11,138 residents of [[Hispanic (U.S. Census)|Hispanic]] or [[Latino (U.S. Census)|Latino]] origin, of any race (20.1%).

The Census reported that 55,415 people (99.8% of the population) lived in households, 102 (0.2%) lived in non-institutionalized group quarters, and 27 (0%) were institutionalized.

There were 17,880 households, out of which 7,008 (39.2%) had children under the age of 18 living in them, 11,792 (66.0%) were [[marriage|opposite-sex married couples]] living together, 2,165 (12.1%) had a female householder with no husband present, 886 (5.0%) had a male householder with no wife present. There were 496 (2.8%) [[POSSLQ|unmarried opposite-sex partnerships]], and 71 (0.4%) [[same-sex partnerships|same-sex married couples or partnerships]]. 2,308 households (12.9%) were made up of individuals, and 740 (4.1%) had someone living alone who was 65 years of age or older. The average household size was 3.10. There were 14,843 [[family (U.S. Census)|families]] (83.0% of all households); the average family size was 3.38.

The age distribution of the population shows 11,895 people (21.4%) under the age of 18, 5,590 people (10.1%) aged 18 to 24, 13,585 people (24.5%) aged 25 to 44, 17,988 people (32.4%) aged 45 to 64, and 6,486 people (11.7%) who were 65 years of age or older. The median age was 41.0 years. For every 100 females, there were 95.2 males. For every 100 females age 18 and over, there were 92.3 males.

There were 18,455 housing units at an average density of {{convert|1,239.8|/sqmi|/km2|sp=us|adj=off}}, of which 14,513 (81.2%) were owner-occupied, and 3,367 (18.8%) were occupied by renters. The homeowner vacancy rate was 0.9%; the rental vacancy rate was 5.2%. 45,080 people (81.2% of the population) lived in owner-occupied housing units and 10,335 people (18.6%) lived in rental housing units.

===2000===
As of the [[census]]<ref name="GR2">{{cite web |url=https://www.census.gov |publisher=[[United States Census Bureau]] |access-date=January 31, 2008 |title=U.S. Census website }}</ref> of 2000, there were 56,287 people, 17,651 households, and 14,809 families residing in the city. The population density was {{convert|3,813.2|PD/sqmi|PD/km2|sp=us|adj=off}}. There were 17,959 housing units at an average density of {{convert|1,216.7|/sqmi|/km2|sp=us|adj=off}}. The racial makeup of the city was 50.4% [[Race (United States census)|Asian]], 33.3% [[Race (United States census)|White]], 3.9% [[Race (United States census)|Black]] or [[Race (United States census)|African American]], 0.33% [[Race (United States census)|Native American]], 0.12% [[Race (United States census)|Pacific Islander]], 7.7% from [[Race (United States census)|other races]], and 4.21% from two or more races. 18.46% of the population were [[Hispanics in the United States|Hispanic]] or [[Race (United States census)|Latino]] of any race.

There were 17,651 households, out of which 44.4% had children under the age of 18 living with them, 68.3% were married couples living together, 11.1% had a female householder with no husband present, and 16.1% were non-families. 12.5% of all households were made up of individuals, and 2.7% had someone living alone who was 65 years of age or older. The average household size was 3.18 and the average family size was 3.47.

In the city, the age distribution of the population shows 27.0% under the age of 18, 8.8% from 18 to 24, 29.6% from 25 to 44, 27.2% from 45 to 64, and 7.5% who were 65 years of age or older. The median age was 36 years. For every 100 females, there were 96.0 males. For every 100 females age 18 and over, there were 92.0 males.

According to the 2007 estimate, the median income for a household in the city was $87,224, and the median income for a family was $93,185. Males had a median income of $51,059 versus $37,002 for females. The [[per capita income]] for the city was $33,540. About 5.0% of families and 6.0% of the population were below the [[poverty line]], including 5.1% of those under age 18 and 6.1% of those age 65 or over.

According to [[Mapping L.A.]], Chinese and Mexican were the most common ancestries. Korea and Taiwan were the most common foreign places of birth in 2000.<ref>{{Cite web|url=https://maps.latimes.com/neighborhoods/neighborhood/diamond-bar/|title=Diamond Bar|website=Mapping L.A.|accessdate=December 20, 2023}}</ref>

==Government==
Diamond Bar City Council is currently headed by Mayor Chia Yu Teng. The other council members are Andrew Chou, Ruth Low, Stan Liu, and Steve Tye.<ref name=cc/>

===Public services===
The [[Los Angeles County Sheriff's Department]] (LASD) operates the Walnut/Diamond Bar Station in [[Walnut, California|Walnut]], serving Diamond Bar.<ref>"[http://www.lasd.org/stations/for3/wlnt-dbar/index.html Walnut/Diamond Bar Station] {{webarchive|url=https://web.archive.org/web/20100106090901/http://www.lasd.org/stations/for3/wlnt-dbar/index.html |date=2010-01-06 }}." [[Los Angeles County Sheriff's Department]]. Retrieved on January 21, 2010.</ref>

The [[Los Angeles County Department of Health Services]] operates the Pomona Health Center in [[Pomona, California|Pomona]], serving Diamond Bar.<ref>"[http://publichealth.lacounty.gov/phn/docs/HealthCenter/pomona.pdf Pomona Health Center]." [[Los Angeles County Department of Health Services]]. Retrieved on March 27, 2010.</ref>

===County, state, and federal representation===
The city is in the First District of the [[Los Angeles County Board of Supervisors]], represented by [[Hilda Solis]].<ref>{{Cite web
 | url = https://hildalsolis.org/the-first-district/
 | title = The First District - Supervisor Hilda L Solis
 }}</ref>

In the [[California State Senate]], Diamond Bar is in {{Representative|casd|30|fmt=sdistrict}}. In the [[California State Assembly]], it is in {{Representative|caad|56|fmt=adistrict}}.<ref>{{Cite web
 | url = https://statewidedatabase.org/gis/districtscomp.html
 | title = California Districts
 | publisher = UC Regents
 | access-date = January 5, 2023
}}</ref>

In the [[United States House of Representatives]], Diamond Bar is in {{Representative|cacd|38|fmt=district}}.<ref>{{Cite GovTrack|CA|38}}</ref>

==Education==
The city is primarily divided into two Blue-ribbon districts. Diamond Bar students north of the city power lines are served by four elementary schools, one middle school, and one high school provided by the Pomona Unified School District.<ref name="cde.ca.gov">{{Cite web|url=http://www.cde.ca.gov/ds/si/ds/pubschls.asp|title=Public Schools and Districts Data Files - Schools & Districts (CA Dept of Education)|website=www.cde.ca.gov|language=en|access-date=February 10, 2017}}</ref> Students south of the power lines running through the city are part of the Walnut Valley Unified School District and are served by nine elementary schools, three middle schools, and three high schools.<ref name="cde.ca.gov"/>

==Economy==

===Top employers===
According to the city's 2012 Comprehensive Annual Financial Report,<ref name="cafr2012">{{cite web|url=http://www.ci.diamond-bar.ca.us/Modules/ShowDocument.aspx?documentid=10992|title=City of Diamond Bar CAFR|access-date=July 9, 2013|archive-url=https://web.archive.org/web/20130826220916/http://www.ci.diamond-bar.ca.us/Modules/ShowDocument.aspx?documentid=10992|archive-date=August 26, 2013|url-status=dead}}</ref> the top employers in the city are:

{| class="wikitable"
|-
! #
! Employer
! # of Employees
|-
| 1
|[[South Coast Air Quality Management District]]
|786
|-
| 2
|[[Walnut Valley Unified School District]]
|520
|-
| 3
|Transcription Services
|500
|-
| 4
|[[The Travelers Companies|Travelers]]
|401
|-
| 5
|Magan Medical Inc
|300
|-
| 6
|[[Pomona Unified School District]]
|210
|-
| 7
|Carrescia James-First Team Sns
|200
|-
| 8
|[[Diamond Bar High School]]
|200
|-
| 9
|First Team Real Estate
|150
|-
| 10
|Baybrook Services Inc
|120
|-
|}

==Notable people==<!--consensus reached to standardize this heading per WP:WikiProject Cities/US Guideline -->
{{More citations needed section|date=December 2012}}
* [[Ling Ling Chang]], former California state assemblywoman and state senator
* [[Danny Dorn]], [[Major League Baseball]] player, [[Arizona Diamondbacks]]
* [[Jim Edmonds]], retired Major League Baseball player, most notably with the [[Anaheim Angels]] and [[St. Louis Cardinals]]<ref>{{cite web |url=http://www.baseball-almanac.com/players/player.php?p=edmonji01|title = Jim Edmonds Stats| publisher= Baseball Almanac|access-date=December 3, 2012}}</ref>
* [[Bob Huff]], California state senator<ref>{{cite web|url= http://votesmart.org/candidate/biography/16575/robert-huff#.UMIi94NTz3Q
|title= SENATOR ROBERT 'BOB' S. HUFF'S BIOGRAPHY|publisher= Project Vote Smart|access-date=December 3, 2012}}.  Huff was born in [[Calexico, California|Calexico]], then moved to Diamond Bar in 1983, at age 30, and as of 2013 still resides there.</ref>
* [[Jay Kim]], first Korean-American [[United States House of Representatives|congressman]]<ref>{{cite encyclopedia|url=http://bioguide.congress.gov/scripts/biodisplay.pl?index=k000181|title=KIM, Jay, (1939–)|dictionary= Biographical Directory of the United States Congress|access-date=December 7, 2012}}</ref>
* [[Ryan Lane]], American actor
* [[Gary Miller (politician)|Gary Miller]], former mayor and [[United States House of Representatives|congressman]]<ref>{{cite web |url=http://garymiller.house.gov/Biography/ |title=About Gary |access-date=June 29, 2008 |work=House of Representatives web site |url-status=dead |archive-url=https://web.archive.org/web/20080625202437/http://garymiller.house.gov/Biography/ |archive-date=June 25, 2008 }}</ref>
* [[Ippei Mizuhara]], Japanese interpreter employed by the [[Los Angeles Angels]] of [[Major League Baseball]] (MLB), most notably serving as [[Shohei Ohtani]]'s interpreter.<ref>{{cite web | url=https://www.sponichi.co.jp/baseball/news/2018/04/17/kiji/20180417s00001007079000c.html | title=大谷はクラブハウスガイ うれしかった初安打の「革手」 - スポニチ Sponichi Annex 野球 }}</ref>
* [[Alex Morgan]], soccer forward, 2015 & 2019 Women's World Cup champion, Olympic gold medalist, member of the [[United States women's national soccer team]]<ref>{{cite news|title=Morgan named U.S. Soccer's Female Athlete of the Year|url=http://www.dailybulletin.com/opinions/ci_22114991/alex-morgan-diamond-bar-named-2012-u-s|access-date=December 7, 2012|newspaper=[[Inland Valley Daily Bulletin]]|date=December 4, 2012|archive-url=https://archive.today/20130121000000/http://www.dailybulletin.com/opinions/ci_22114991/alex-morgan-diamond-bar-named-2012-u-s|archive-date=January 21, 2013|url-status=dead}}</ref>
* [[Teddy Park]], South Korean producer and rapper; known for being a major producer for K-pop groups [[Blackpink]], [[2NE1]], and [[Big Bang (band)|Big Bang]]<ref name="1TYM YG BOUNCE">{{cite web|url=http://ygbounce.com/?page_id=20|title=1TYM YG BOUNCE|access-date=December 12, 2012|url-status=usurped|archive-url=https://web.archive.org/web/20120514174520/http://ygbounce.com/?page_id=20|archive-date=May 14, 2012}}</ref>
* [[Gary Pettis]], former center fielder for the [[California Angels]] and current coach for the [[Houston Astros]].
* [[Xavier Scruggs]], former first baseman for the [[St. Louis Cardinals]], born in Diamond Bar in 1987.
* [[Snoop Dogg]], rapper<ref>{{cite magazine |url=https://www.rollingstone.com/music/news/americas-most-lovable-pimp-20061214 |title=America's Most Lovable Pimp |access-date=January 31, 2017 |author=Touré |date=December 14, 2006 |magazine=[[Rolling Stone]] }}</ref>
* [[Taebin]], South Korean rapper and singer; member of hip hop group [[1TYM]]<ref name="1TYM YG BOUNCE"/>
* [[Keith Van Horn]], retired [[National Basketball Association|NBA]] player; drafted 1st round, 2nd overall pick in the 1997 draft by the Philadelphia 76ers, later on traded to the New Jersey Nets; played with the [[Philadelphia 76ers]], [[New Jersey Nets]], [[Milwaukee Bucks]], and [[Dallas Mavericks]]<ref>{{cite web|url= https://www.basketball-reference.com/players/v/vanhoke01.html
|title= Keith Adam Van Horn|publisher= Basketball-Reference.com|access-date=December 3, 2012}}</ref>
* [[Ryan Wendell]], offensive lineman for the [[New England Patriots]]<ref>{{cite web|url= http://www.gobulldogs.com/sports/m-footbl/mtt/wendell_ryan00.html|title= Ryan Wendell|publisher= Fresno State|access-date= December 3, 2012|url-status= dead|archive-url= https://web.archive.org/web/20120722041046/http://www.gobulldogs.com/sports/m-footbl/mtt/wendell_ryan00.html|archive-date= July 22, 2012}}</ref>
* [[Jason Wright]], American businessman and football executive<ref>{{cite web |title=Jason Wright – Football bio |url=http://nusports.cstv.com/sports/m-footbl/mtt/wright_jason00.html |website=nusports.cstv.com |archive-url=https://web.archive.org/web/20101118091933/http://nusports.cstv.com/sports/m-footbl/mtt/wright_jason00.html |access-date=August 18, 2020|archive-date=November 18, 2010 }}</ref>
* [[Tiffany Young]], [[Korean American|Korean-American]] singer; member of girl group [[Girls' Generation]]<ref name="Stephanie Hwang Profile">{{cite web|url=http://snsdkorean.com/snsd-members/snsd-tiffany-profile/|title=TIFFANY PROFILE|access-date=June 28, 2013|date=December 17, 2010}}</ref>

==See also==
{{Portal|Greater Los Angeles}}
*[[Freeway Complex Fire]]

==References==
{{Reflist}}

==External links==
{{Commons category}}
*{{Official website|https://www.diamondbarca.gov/}}
*[http://www.regionalchambersgv.com/ Regional Chamber of Commerce – San Gabriel Valley]
*{{cite book|url=https://books.google.com/books?id=DzKrBAAAQBAJ&q=covina+images+of+america|title=Diamond Bar|isbn=9781439647455 |last1=Bar |first1=City of Diamond |date=September 29, 2014 |publisher=Arcadia }}

{{Cities of Los Angeles County, California}}
{{Greater Los Angeles Area}}
{{authority control}}

[[Category:Diamond Bar, California| ]]
[[Category:Cities in Los Angeles County, California]]
[[Category:Incorporated cities and towns in California]]