Editing Newcastle, Washington

{{Short description|City in Washington, United States}}
{{Use mdy dates|date=July 2023}}
{{Infobox settlement
|official_name            = Newcastle, Washington
|settlement_type          = [[City government in Washington (state)|City]]
|image_skyline            = Newcastle sunny.jpg
|imagesize                = 
|image_caption            = Intersection between Coal Creek Parkway and Newcastle Way, looking northwest towards Bellevue
|image_map                = King_County_Washington_Incorporated_and_Unincorporated_areas_Newcastle_Highlighted.svg
|mapsize                  = 250px
|map_caption              = Location of Newcastle, Washington
<!-- Location ---->
|subdivision_type         = Country
|subdivision_name         = United States
|subdivision_type1        = [[U.S. state|State]]
|subdivision_name1        = [[Washington (state)|Washington]]
|subdivision_type2        = [[List of counties in Washington|County]]
|subdivision_name2        = [[King County, Washington|King]]
<!-- Government ---->
|government_footnotes     = <ref>{{cite web|title=City Council|url=https://www.newcastlewa.gov/city_hall/city_council|publisher=City of Newcastle, Washington|access-date=November 28, 2024}}</ref>
|government_type          = [[Council–manager government|Council–manager]]
|leader_title             = [[Mayor]]
|leader_name              = Robert Clark
|leader_title1            = [[City manager]]
|leader_name1             = Scott Pingel
|established_title        = Founded
|established_date         = 1869
|established_title1       = [[Municipal corporation|Incorporated]]
|established_date1        = September 30, 1994
<!-- Area ---->
|unit_pref                = Imperial
|area_footnotes           = <ref name="CenPopGazetteer2024">{{cite web|title=2024 U.S. Gazetteer Files|url=https://www2.census.gov/geo/docs/maps-data/data/gazetteer/2024_Gazetteer/2024_gaz_place_53.txt|publisher=United States Census Bureau|access-date=November 28, 2024}}</ref>
|area_total_km2           = 11.55
|area_land_km2            = 11.49
|area_water_km2           = 0.06
|area_total_sq_mi         = 4.46
|area_land_sq_mi          = 4.44
|area_water_sq_mi         = 0.03
<!-- Population ----->
|population_as_of         = [[2020 United States census|2020]]
|population_footnotes     = <ref name="2020 Census (City)"/>
|population_total         = 13017
|population_density_km2   = 1111.01
|population_density_sq_mi = 2877.48
|population_est           = 12761
|pop_est_as_of            = 2023
|pop_est_footnotes        = <ref name="USCensusEst2023"/>
<!-- General information -->
|timezone                 = [[Pacific Time Zone|Pacific (PST)]]
|utc_offset               = −8
|timezone_DST             = PDT
|utc_offset_DST           = −7
|elevation_footnotes      = <ref name=gnis/>
|elevation_ft             = 381
|coordinates              = {{coord|47|31|49|N|122|09|48|W|region:US-WA_type:city|display=inline}}
<!-- Area/postal codes and others --->
|postal_code_type         = [[ZIP Code]]s
|postal_code              = 98056, 98059
|area_code                = [[Area code 425|425]]
|blank_name               = [[Federal Information Processing Standard|FIPS code]]
|blank_info               = 53-48645
|blank1_name              = [[Geographic Names Information System|GNIS]] feature ID
|blank1_info              = 2411243<ref name=gnis>{{GNIS|2411243}}</ref>
|website                  = {{URL|https://www.newcastlewa.gov/|newcastlewa.gov}}
|footnotes                = 
}}

'''Newcastle''' is an [[Eastside (King County, Washington)|Eastside]] city in [[King County, Washington|King County]], [[Washington (state)|Washington]], United States. The population was 13,017 at the [[2020 United States Census|2020 census]].<ref name="2020 Census (City)">{{cite web|title=Explore Census Data |url=https://data.census.gov/profile/Newcastle_city,_Washington?g=160XX00US5348645 |publisher=[[United States Census Bureau]] |access-date=November 28, 2024}}</ref>

Although Newcastle was not incorporated until 1994, it has been an important settlement and town since the late 19th century and played a major role in the development of [[Seattle]] and the [[Seattle metropolitan area|surrounding region]].<ref name=profile>{{cite web|title=City Profile and History |publisher=City of Newcastle |url=http://www.ci.newcastle.wa.us/r_an_city_profile_and_history.asp |access-date=August 9, 2009 |url-status=dead |archive-url=https://web.archive.org/web/20090519012137/http://www.ci.newcastle.wa.us/r_an_city_profile_and_history.asp |archive-date=May 19, 2009}}</ref> Newcastle was one of the region's first [[coal]] mining areas and its [[rail transport|railroad]] link to Seattle was the first in King County. [[Lumber|Timber]] also played a role in the early history of Newcastle. Coal delivered by rail from Newcastle's mines to Seattle fueled the growth of the [[Port of Seattle]] and attracted railroads, most notably the [[Great Northern Railway (U.S.)|Great Northern Railway]].

The Newcastle coal mine began producing coal by the 1870s. More than 13 million tons of coal had been extracted by the time the mine closed in 1963. The history of Newcastle's coal mining industry and the legacy of the mines' many Chinese laborers are memorialized in place names such as [[Coal Creek (Washington)|Coal Creek]], Coal Creek Parkway, and the Coal Creek and China Creek golf courses.

Based on [[Washington locations by per capita income|per capita income]], Newcastle ranks 13th of 522 areas in the state of Washington to be ranked.<ref>{{cite web |title= The 50 Wealthiest Cities In Washington State, From The Latest Census Data |publisher= [[Forbes]] |url= https://www.forbes.com/sites/andrewdepietro/2024/09/16/the-50-wealthiest-cities-in-washington-state-from-the-latest-census-data/ |access-date=April 10, 2025}}</ref> In CNN Money's 2011 rankings of best places to live in the United States, Newcastle was in the top 20, along with nearby [[Sammamish, Washington|Sammamish]]. It ranked 17th in ''Newsweek's'' 2009 rankings of best places to live in the United States.

==History==
Coal was discovered along Coal Creek in 1863 by surveyors Philip H. Lewis and Edwin Richardson, who had been working in the area for the [[United States General Land Office]].<ref>{{cite web |title= Surveyors discover coal at Newcastle (east King County) in October 1863. |publisher= [[HistoryLink]] |url= http://www.historylink.org/index.cfm?DisplayPage=output.cfm&file_id=149 |access-date=August 9, 2009}}</ref> Newcastle was named for the idiom "[[Coals to Newcastle]]" by a party of coal surveyors in 1869 according to F. H. Whitworth, who was part of the party. One of them suggested the name "New Castle" which was subsequently adopted by all parties of interest. The idiom itself refers to the English city of [[Newcastle upon Tyne]].<ref>{{cite book |last=Meany |first=Edmond S. |author-link=Edmond S. Meany |year=1923 |title=Origin of Washington Geographic Names |page=187 |publisher=[[University of Washington Press]] |url=https://babel.hathitrust.org/cgi/pt?id=mdp.39015027074981&view=1up&seq=203 |via=[[HathiTrust]] |accessdate=August 3, 2022}}</ref>

Newcastle (originally spelled "New Castle") as a village was properly established by the 1870s, though the official date given for the founding of the town is 1869, as seen on the seal for the City of Newcastle. By 1872, 75–100 tons of coal per day were being produced at Newcastle. About 60 men worked at the mines.<ref>{{cite web |title= Newcastle (King County) produces 75 to 100 tons of coal per day in 1872. |publisher= [[HistoryLink]] |url= http://www.historylink.org/index.cfm?DisplayPage=output.cfm&file_id=195 |access-date=August 9, 2009}}</ref> The [[Seattle and Walla Walla Railroad]], the first railroad in King County, reached Newcastle from Seattle in 1878.<ref>HistoryLink (2018), ''[http://www.historylink.org/File/247 Seattle & Walla Walla Railroad reaches Newcastle on February 5, 1878.]''.  Retrieved April 14, 2018.</ref> Coal mining ended in 1963.

The area was an [[unincorporated area]] within [[King County, Washington|King County]] until it incorporated as a city on September 30, 1994. Currently the city is a [[suburban]] community. Based on Newcastle's location north of [[Renton, Washington|Renton]], south of [[Bellevue, Washington|Bellevue]], and across Lake Washington from [[Seattle]], these are the communities in which most of the residents of Newcastle work. East of southeast Lake Washington is a large quantity of hilly terrain, which creates opportunities for view properties. This created the impetus for the location of the Newcastle Golf Course, along with many high-value homes at higher elevations with views of downtown Bellevue, Seattle, and [[Mercer Island, Washington|Mercer Island]], as well as the [[Olympic Mountains]]. Notable attractions of the area include the Golf Club at Newcastle, a brand new Family [[YMCA]], Lake Boren Park, a well developed trail system, and nearby [[Cougar Mountain]] in the east of Newcastle.

===Newcastle and Newport Hills===
The community was not always known as Newcastle. When suburban development came in the 1960s, the old mining town of Newcastle was long gone and all but forgotten. The area then became known as Newport Hills.

In the early 1990s there was a movement to incorporate as a new city. But some members of the community objected—some believed that the new city would be too small to be viable, while others feared that the city council would be in the pocket of the hilltop golf course. In 1993, five parcels of Newport Hills each voted to annex themselves into Bellevue. Those 5 parcels comprised nearly half the population of the community. They became the Newport Hills neighborhood of Bellevue. When Newport Hills incorporated as a new city the following year, their first order of business was to choose a new name, since it would now be confusing to have a city of Newport Hills adjacent to the Newport Hills neighborhood of Bellevue. Residents voted on Cougar Mountain and Newcastle and chose the latter.<ref>{{Cite web|url=https://www.historylink.org/File/7690|title=City of Newport Hills (Later Newcastle) takes form on September 30, 1994}}</ref>

==Newcastle trails==
[[File:Newcastle trail marker.jpg|thumb|upright|Trail marker in Newcastle Commons, along the Thomas Rouse Trail]]
The city has an active trail-building community, creating a system of trails that are being integrated into new housing developments and parks.<ref>{{Cite web |last=City of Newcastle |date=May 23, 2022 |title=Newcastle Trail System Map |url=https://cdnsm5-hosted.civiclive.com/UserFiles/Servers/Server_4026035/File/Your%20Community/Parks,%20Trails%20and%20Other%20Recreation/Newcastle%20Trail_System_2022.pdf |url-status=live |archive-url=http://web.archive.org/web/20240710182059/https://cdnsm5-hosted.civiclive.com/UserFiles/Servers/Server_4026035/File/Your%20Community/Parks,%20Trails%20and%20Other%20Recreation/Newcastle%20Trail_System_2022.pdf |archive-date=July 10, 2024 |access-date=September 1, 2024}}</ref>  Most of the trail-work has been completed by volunteers and the [[Washington Conservation Corps]], sponsored by the city of Newcastle. The trail system will eventually lead all the way to Lake Washington to the west, in conjunction with [[Renton, Washington|Renton]], and is already connected to [[Cougar Mountain Regional Wildland Park]] to the east, which is in unincorporated King County.

==Zip codes==
The city has not obtained its own [[ZIP code]] even though, based on the ZIP code designation, some [[sales tax]]es paid by Newcastle residents go to [[Renton, Washington|Renton]] instead of Newcastle as tax revenues (among other perceived detrimental impacts related to mail service, insurance rates, property values, and credit ratings).<ref>{{cite web |author=Tim Pfarr |date=September 3, 2009 |title=Postal Service denies city new ZIP code |url=http://www.newcastle-news.com/2009/09/03/postal-service-denies-city-new-zip-code |url-status=dead |archive-url=http://web.archive.org/web/20140504025553/http://www.newcastle-news.com/2009/09/03/postal-service-denies-city-new-zip-code |archive-date=May 4, 2014 |access-date=July 5, 2012 |website=Newcastle News}}</ref><ref>{{cite web |date=June 5, 2009 |title=City continues fight for new ZIP code |url=http://www.newcastle-news.com/2009/06/05/city-continues-fight-for-new-zip-code |url-status=dead |archive-url=http://web.archive.org/web/20101222202022/http://www.newcastle-news.com/2009/06/05/city-continues-fight-for-new-zip-code |archive-date=December 22, 2010 |access-date=July 5, 2012 |website=Newcastle News}}</ref><ref>{{cite web |author=Jim Feehan |date=July 3, 2009 |title=ZIP code survey shows delivery, tax problems |url=http://www.newcastle-news.com/2009/07/03/zip-code-survey-shows-delivery-tax-problems |url-status=dead |archive-url=http://web.archive.org/web/20140504023520/http://www.newcastle-news.com/2009/07/03/zip-code-survey-shows-delivery-tax-problems |archive-date=May 4, 2014 |access-date=July 5, 2012 |website=Newcastle News}}</ref><ref>{{cite web |author=Mike Lindblom |date=August 9, 2000 |title=ZIP-code blues tax Newcastle |url=https://archive.seattletimes.com/archive/20000809/4035894/zip-code-blues-tax-newcastle |url-status=live |archive-url=https://archive.seattletimes.com/archive/?date=20000809&slug=4035894 |archive-date=November 22, 2023 |access-date=July 5, 2012 |website=The Seattle Times}}</ref> This is all the more troubling{{why|date=May 2022}} considering the small size of Newcastle with a small commercial district which does not create as much property tax or sales tax revenue for the city compared to neighboring cities like Renton to the south, [[Bellevue, Washington|Bellevue]] to the north, or [[Issaquah, Washington|Issaquah]] to the east.

{{wide image|Mercer Island from Golf Club.JPG|600px|View from the Golf Club of Newcastle. The skyscrapers of both Seattle and Bellevue are visible, as well as [[Lake Washington]] and Mercer Island.}}

==Geography==
[[Coal Creek (Washington)|Coal Creek]] flows through the city from the [[Issaquah Alps]] to Lake Washington. [[Lake Boren]] is located near downtown.

Newcastle is bordered to the north by [[Bellevue, Washington|Bellevue]], to the south by [[Renton, Washington|Renton]], to the east by unincorporated land on [[Cougar Mountain]], and to the west by [[Lake Washington]].

According to the [[United States Census Bureau]], the city has a total area of {{convert|4.460|sqmi|sqkm|2}}, of which {{convert|4.435|sqmi|sqkm|2}} is land and {{convert|0.125|sqmi|sqkm|2}} is water.<ref name="CenPopGazetteer2024"/>

===Climate===
{{Weather box
|location = Newcastle, Washington
|single line = Y
|collapsed = Y
|Jan record high F = 64
|Feb record high F = 71
|Mar record high F = 81
|Apr record high F = 86
|May record high F = 93
|Jun record high F = 100
|Jul record high F = 104
|Aug record high F = 99
|Sep record high F = 96
|Oct record high F = 86
|Nov record high F = 78
|Dec record high F = 69
|year record high F= 104
|Jan high F = 48
|Feb high F = 51
|Mar high F = 56
|Apr high F = 61
|May high F = 67
|Jun high F = 72
|Jul high F = 78
|Aug high F = 78
|Sep high F = 72
|Oct high F = 62
|Nov high F = 52
|Dec high F = 46
|year high F=
|Jan low F = 36
|Feb low F = 36
|Mar low F = 39
|Apr low F = 42
|May low F = 48
|Jun low F = 53
|Jul low F = 56
|Aug low F = 56
|Sep low F = 51
|Oct low F = 45
|Nov low F = 39
|Dec low F = 35
|year low F=
|Jan record low F = −10
|Feb record low F = −5
|Mar record low F = 10
|Apr record low F = 25
|May record low F = 27
|Jun record low F = 33
|Jul record low F = 38
|Aug record low F = 34
|Sep record low F = 28
|Oct record low F = 24
|Nov record low F = −1
|Dec record low F = 3
|year record low F= −10
|Jan precipitation inch = 4.8
|Feb precipitation inch = 3.4
|Mar precipitation inch = 3.5
|Apr precipitation inch = 2.8
|May precipitation inch = 2.2
|Jun precipitation inch = 1.6
|Jul precipitation inch = 0.8
|Aug precipitation inch = 1.0
|Sep precipitation inch = 1.5
|Oct precipitation inch = 3.4
|Nov precipitation inch = 5.8
|Dec precipitation inch = 5.4
|year precipitation inch= 36.2
|source 1 = Weather.com<ref name="weather.com">{{cite web|url=https://weather.com/weather/monthly/l/1050828:5:US |title=Monthly Averages for Newcastle, WA |publisher=The Weather Channel |access-date=April 20, 2016}}</ref>
|date=August 2010
}}

==Schools==
Newcastle is served by two school districts, with the boundary line roughly going north–south just to the west of Coal Creek Parkway. The three "in-city" schools are Newcastle Elementary, which is operated by the Issaquah School District 411 and Hazelwood Elementary next to Risdon Middle School which are operated by Renton School District 403.

'''District:''' [[Issaquah School District]] No. 411<ref name=KingCoSDMap>{{cite map|author=U.S. Census Bureau Geography Division |date=December 21, 2020 |title=2020 Census – School District Reference Map: King County, WA |page=2 |scale=1:80,000 |url=https://www2.census.gov/geo/maps/DC2020/PL20/st53_wa/schooldistrict_maps/c53033_king/DC20SD_C53033.pdf |publisher=United States Census Bureau |accessdate=August 3, 2022}}</ref>

'''Schools:''' [[Newcastle Elementary School]], [[Cougar Mountain Middle School]] and [[Liberty High School (Washington)|Liberty High School]]

'''Neighborhoods:''' The Highlands at Newcastle, East Olympus, Mile Post, Lake Boren, The Trails at Newcastle, China Creek, China Falls, The Reserve at Newcastle

'''District:''' [[Renton School District]] No. 403<ref name=KingCoSDMap/>

'''Schools:''' Hazelwood Elementary School, Risdon Middle School, [[Hazen High School (Washington)|Hazen High School]]

'''Neighborhoods:''' Lake Washington Ridge, West Olympus, Hazelwood, Newport Woods, Newport Hills

==Surrounding cities and neighborhoods==
{{Geographic location
|Northwest = [[Bellevue, Washington|Bellevue]]
|North     = [[Factoria, Bellevue]]
|Northeast = [[Bellevue, Washington|Bellevue]]
|West      = [[Mercer Island, Washington|Mercer Island]]
|Center    = Newcastle
|South     = [[Renton, Washington|Renton]]
|Southwest = [[Kennydale, Renton, Washington|Kennydale, Renton]]
|Southeast = 
|East      = [[Issaquah, Washington|Issaquah]]
}}

==Demographics==
{{US Census population
|1980= 12245
|1990= 14736
|2000= 7737
|2010= 10380
|2020= 13017
|estyear=2023
|estimate=12761
|estref=<ref name="USCensusEst2023">{{cite web|url=https://www.census.gov/data/tables/time-series/demo/popest/2020s-total-cities-and-towns.html |date=November 28, 2024|title=City and Town Population Totals: 2020–2023|publisher=United States Census Bureau|accessdate=November 28, 2024}}</ref>
|align-fn=center
|footnote=Source:<ref>Census figures for 1980 & 1990 enumerated prior to incorporation as '''Newport Hills [[Census-designated place|CDP]]'''. The city's boundaries are much smaller than the CDP area, as the remainder of the CDP area was annexed by [[Bellevue, Washington|Bellevue]]. ''See "Census 2000 Boundary Change Notes for Washington" for further information''.</ref><br>U.S. Decennial Census<ref>{{cite web|url=https://www.census.gov/programs-surveys/decennial-census.html|title=Census of Population and Housing|publisher=United States Census Bureau|accessdate=June 4, 2015}}</ref><br>2020 Census<ref name="2020 Census (City)"/>
}}

Although the present-day [[African American]] population of Newcastle is small, in the 1880s when it was a mining center, Newcastle had the [[Puget Sound]] area's largest African American population, greater even than that of Seattle.<ref>Esther Hall Mumford (1980), ''Seattle's Black Victorians 1852-1901'', Seattle: Ananse Press, p. 13.</ref>

===2020 census===
{| class="wikitable"
|+'''Newcastle, Washington – 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 – Newcastle city, Washington|url=https://data.census.gov/table/DECENNIALSF12000.P004?g=160XX00US5348645|publisher=[[United States Census Bureau]]|access-date=November 28, 2024}}</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) – Newcastle city, Washington|url=https://data.census.gov/table?q=p2&g=160XX00US5348645&tid=DECENNIALPL2010.P2|publisher=[[United States Census Bureau]]|access-date=November 28, 2024}}</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) – Newcastle city, Washington|url=https://data.census.gov/cedsci/table?q=p2&g=160XX00US5348645&tid=DECENNIALPL2020.P2|publisher=[[United States Census Bureau]]|access-date=November 28, 2024}}</ref>
! % 2000
! % 2010
! {{partial|% 2020}}
|-
| [[Non-Hispanic or Latino whites|White]] alone (NH)
| 5,700
| 6,551
| style='background: #ffffe6; |6,307
| 73.67%
| 63.11%
| style='background: #ffffe6; |48.45%
|-
| [[Non-Hispanic or Latino African Americans|Black or African American]] alone (NH)
| 121
| 259
| style='background: #ffffe6; |444
| 1.56%
| 2.50%
| style='background: #ffffe6; |3.41%
|-
| [[Native Americans in the United States|Native American]] or [[Alaska Native]] alone (NH)
| 34
| 34
| style='background: #ffffe6; |23
| 0.44%
| 0.33%
| style='background: #ffffe6; |0.18%
|-
| [[Asian Americans|Asian]] alone (NH)
| 1,402
| 2,549
| style='background: #ffffe6; |4,513
| 18.12%
| 24.56%
| style='background: #ffffe6; |34.67%
|-
| [[Pacific Islander Americans|Pacific Islander]] alone (NH)
| 19
| 32
| style='background: #ffffe6; |20
| 0.25%
| 0.31%
| style='background: #ffffe6; |0.15%
|-
| [[Race and ethnicity in the United States census|Other race]] alone (NH)
| 23
| 31
| style='background: #ffffe6; |68
| 0.30%
| 0.30%
| style='background: #ffffe6; |0.52%
|-
| [[Multiracial Americans|Mixed race or multiracial]] (NH)
| 215
| 484
| style='background: #ffffe6; |895
| 2.78%
| 4.66%
| style='background: #ffffe6; |6.88%
|-
| [[Hispanic and Latino Americans|Hispanic or Latino]] (any race)
| 223
| 440
| style='background: #ffffe6; |747
| 2.88%
| 4.24%
| style='background: #ffffe6; |5.74%
|-
| '''Total'''
| '''7,737'''
| '''10,380'''
| style='background: #ffffe6; |'''13,017'''
| '''100.00%'''
| '''100.00%'''
| style='background: #ffffe6; |'''100.00%'''
|}
As of the [[2020 United States census|2020 census]], there were 13,017 people, 5,132 households, and 3,631 families residing in the city.<ref>{{Cite web|title=US Census Bureau, Table P16: Household Type |url=https://data.census.gov/table?q=Newcastle%20city,%20Washington%20p16&y=2020 |access-date=November 28, 2024 |publisher=United States Census Bureau}}</ref> The [[population density]] was {{convert|2925.8|PD/sqmi|PD/km2|1}}. There were 5,471 housing units at an average density of {{convert|1229.7|/sqmi|/km2|1}}. The racial makeup of the city was 49.60% [[White (U.S. Census)|White]], 3.41% [[African American (U.S. Census)|African American]], 0.32% [[Native American (U.S. Census)|Native American]], 34.82% [[Asian (U.S. Census)|Asian]], 0.21% [[Race (U.S. Census)|Pacific Islander]], 1.99% from some other races and 9.65% from two or more races. [[Hispanic and Latino Americans|Hispanic or Latino]] people of any race were 5.74% of the population.<ref>{{Cite web|title=How many people live in Newcastle city, Washington |url=https://data.usatoday.com/census/total-population/total-population-change/newcastle-city-washington/160-5348645/ |access-date=November 28, 2024 |publisher=USA Today}}</ref> 20.9% of residents were under the age of 18, 7.0% were under 5 years of age, and 13.6% were 65 and older. The gender makeup of the city was 50.0% female.

===2010 census===
As of the [[2010 United States census|2010 census]], there were 10,380 people, 4,021 households, and 2,860 families residing in the city. The population density was {{convert|2334.1|PD/sqmi|PD/km2|1}}. There were 4,227 housing units at an average density of {{convert|949.9|/sqmi|/km2|1}}. The racial makeup of the city was 65.36% [[White (U.S. Census)|White]], 2.60% [[African American (U.S. Census)|African American]], 0.37% [[Native American (U.S. Census)|Native American]], 24.67% [[Asian (U.S. Census)|Asian]], 0.33% [[Race (U.S. Census)|Pacific Islander]], 1.63% from some other races and 5.05% from two or more races. [[Hispanic and Latino Americans|Hispanic or Latino]] people of any race were 4.24% of the population.

There were 4,021 households, of which 35.3% had children under the age of 18 living with them, 61.6% were [[Marriage|married couples]] living together, 6.2% had a female householder with no husband present, 3.3% had a male householder with no wife present, and 28.9% were non-families. 21.8% of all households were made up of individuals, and 4.4% had someone living alone who was 65 years of age or older. The average household size was 2.57 and the average family size was 3.04.

The median age in the city was 38.7 years. 23.7% of residents were under the age of 18; 6.6% were between the ages of 18 and 24; 31.1% were from 25 to 44; 29.7% were from 45 to 64; and 9% were 65 years of age or older. The gender makeup of the city was 49.6% male and 50.4% female.

The median income for a household in the city was $109,833. The per capita income for the city was $58,118. The median home cost in Newcastle is $511,500.

===2000 census===
As of the [[2000 United States census|2000 census]], there were 7,737 people, 3,028 households, and 2,189 families residing in the city. The population density was {{convert|1731.5|PD/sqmi|PD/km2|1}}. There were 3,117 housing units at an average density of {{convert|697.6|/sqmi|/km2|1}}. The racial makeup of the city was 75.05% [[White (U.S. Census)|White]], 1.62% [[African American (U.S. Census)|African American]], 0.45% [[Native American (U.S. Census)|Native American]], 18.25% [[Asian (U.S. Census)|Asian]], 0.25% [[Race (U.S. Census)|Pacific Islander]], 1.36% from some other races and 3.02% from two or more races. [[Hispanic and Latino Americans|Hispanic or Latino]] people of any race were 2.88% of the population.

There were 3,028 households, out of which 34.3% had children under the age of 18 living with them, 63.7% were [[Marriage|married couples]] living together, 5.8% had a female householder with no husband present, and 27.7% were non-families. 20.5% of all households were made up of individuals, and 2.8% had someone living alone who was 65 years of age or older. The average household size was 2.55 and the average family size was 2.98.

In the city the population was spread out, with 23.4% under the age of 18, 7.2% from 18 to 24, 37.9% from 25 to 44, 24.9% from 45 to 64, and 6.6% who were 65 years of age or older. The median age was 36 years. For every 100 females, there were 100.0 males. For every 100 females age 18 and over, there were 97.9 males.

The median income for a household in the city was $80,320, and the median income for a family was $91,381. Males had a median income of $60,639 versus $41,868 for females. The [[per capita income]] for the city was $35,057. About 1.8% of families and 2.0% of the population were below the [[Poverty threshold|poverty line]], including 1.1% of those under age 18 and 6.6% of those age 65 or over.

==Notable residents==
Newcastle has been a preferred residence of numerous current and former [[Seattle Seahawks]] players, coaches, and front office personnel{{citation needed|date=September 2018}} due to its close proximity to the NFL franchise's headquarters and practice facility on Lake Washington at the [[Virginia Mason Athletic Center]] (VMAC) in Renton.

* [[Gus Bradley]], former defensive coordinator for the [[Seattle Seahawks]]
* [[Nate Burleson]], former NFL player for the Seattle Seahawks and NFL commentator
* [[John Carlson (American football)|John Carlson]], former NFL player for the Seattle Seahawks, [[Minnesota Vikings]], and [[Arizona Cardinals]]
* [[Kam Chancellor]], NFL player for the Seattle Seahawks
* [[James Hasty]], former NFL player for the [[Kansas City Chiefs]] and the [[New York Jets]]
* [[Steve Hutchinson (American football)|Steve Hutchinson]], former NFL player for the Seattle Seahawks
* [[Julian Peterson]], former NFL player for the Seattle Seahawks  
* [[Dan Quinn (American football)|Dan Quinn]], former defensive coordinator for the Seattle Seahawks
* [[Mack Strong]], former NFL player for the Seattle Seahawks
* [[Marcus Trufant]], former NFL player for the Seattle Seahawks
* [[Alan White (Yes drummer)|Alan White]], drummer for the progressive rock band [[Yes (band)|Yes]]

==City landmarks==
The city of Newcastle has designated the following landmarks:
{|class="wikitable"
|-
! Landmark
! Built
! Listed
! Address
! Photo
|-
| [[Newcastle Cemetery]]<ref name=landmarks>{{cite web|url=http://www.kingcounty.gov/~/media/property/historic_preservation/documents/resources/T06_KCLandmarkList.ashx |title=King County and City Landmarks List }} {{small|(372 KB)}}. King County (undated, last modified March, 2014). Retrieved September 28, 2014.</ref><ref>{{cite web|url=https://www.newcastlewahistory.org/richs-stories/newcastles-coal-miners-cemetery-part-1/ |title=Newcastle's Coal Miners Cemetery – Part 1}}</ref> || 1879 (First burial) || 1982 || SW of 69th Way off 129th Avenue SE || 
|-
| [[Pacific Coast Coal Co. House#75]]<ref name=landmarks /> || 1870s || 1982 || 7210 138th Avenue SE || 
|-
| [[Thomas Rouse Road]]<ref name=landmarks /> || 1880 || 1984 || 136th SE & 144th Place SE || 
|}
 
==Golf==
[[File:Newcastle WA Golf Clubhouse.jpg|thumb|Newcastle golf clubhouse]]
Newcastle is known for its 36-hole, {{convert|350|acre|adj=on}} golf complex, which features two championship, 18-hole courses known as the Coal Creek and China Creek courses. Designed by golf course architect [[Robert E. Cupp]] in consultation with PGA Masters champion [[Fred Couples]] and in partnership with Oki Golf, the courses have views of [[Mount Rainier]], Lake Washington, Lake Sammamish, the Olympic and [[Cascade Range|Cascade]] mountain ranges, and the downtown skylines of the cities of Seattle and Bellevue. Practice and hospitality facilities include a heated driving range, a pro shop, an 18-hole mini-golf/putting range, private (pitching/putting/chipping) practice tees, and a {{convert|44000|sqft|adj=on}} clubhouse with restaurants, pubs, and event spaces.<ref>{{cite web|url=https://okigolf.com/Courses/NewCastle/Pages/Newcastle-AboutUs.aspx|archive-url=https://web.archive.org/web/20180922063925/https://okigolf.com/Courses/NewCastle/Pages/Newcastle-AboutUs.aspx|archive-date=September 22, 2018|access-date=August 7, 2023|title=The Golf Club at Newcastle - History}}</ref> 
{{Clear}}

==References==
{{Reflist}}

==External links==
{{Commons category}}
* [https://www.newcastlewa.gov/ City of Newcastle – official website]

{{King County, Washington}}

{{Authority control}}

[[Category:Cities in King County, Washington]]
[[Category:Cities in the Seattle metropolitan area]]
[[Category:Former census-designated places in Washington (state)]]
[[Category:Cities in Washington (state)]]