Editing Plymouth County, Iowa (section)

==Demographics==
{{US Census population
|1860= 148
|1870= 2199
|1880= 8566
|1890= 19568
|1900= 22209
|1910= 23129
|1920= 23584
|1930= 24159
|1940= 23502
|1950= 23252
|1960= 23906
|1970= 24322
|1980= 24743
|1990= 23388
|2000= 24849
|2010= 24986
|2020= 25698
|estyear=2023
|estimate=25722
|estref=<ref name="USCensusEst2023">{{cite web|url=https://www.census.gov/programs-surveys/popest/data/tables.html|title=Annual Estimates of the Resident Population for Counties: April 1, 2020 to July 1, 2023|publisher=United States Census Bureau|access-date=April 2, 2024}}</ref>
|align-fn=center
|footnote=U.S. Decennial Census<ref>{{cite web|url=https://www.census.gov/programs-surveys/decennial-census.html|title=U.S. Decennial Census|publisher=United States Census Bureau|access-date=July 20, 2014}}</ref><br />1790-1960<ref>{{cite web|url=http://mapserver.lib.virginia.edu|title=Historical Census Browser|publisher=University of Virginia Library|access-date=July 20, 2014}}</ref> 1900-1990<ref>{{cite web|url=https://www.census.gov/population/cencounts/ia190090.txt|title=Population of Counties by Decennial Census: 1900 to 1990|publisher=United States Census Bureau|access-date=July 20, 2014}}</ref><br />1990-2000<ref>{{cite web|url=https://www.census.gov/population/www/cen2000/briefs/phc-t4/tables/tab02.pdf |archive-url=https://web.archive.org/web/20100327165705/http://www.census.gov/population/www/cen2000/briefs/phc-t4/tables/tab02.pdf |archive-date=March 27, 2010 |url-status=live|title=Census 2000 PHC-T-4. Ranking Tables for Counties: 1990 and 2000|publisher=United States Census Bureau|access-date=July 20, 2014}}</ref> 2010-2018<ref name="QF">{{cite web|title=State & County QuickFacts|url=http://quickfacts.census.gov/qfd/states/19/19149.html|publisher=United States Census Bureau|access-date=July 20, 2014|archive-url=https://web.archive.org/web/20160205224520/http://quickfacts.census.gov/qfd/states/19/19149.html|archive-date=February 5, 2016|url-status=dead}}</ref>
}}
[[File:PlymouthCountyIowaPop2020.png|thumb|right|Population of Plymouth County from US census data]]

===2020 census===
[[File:PlymouthCountyIA2022PopPyr.png|thumb|left|2022 US Census [[population pyramid]] for Plymouth County from [[American Community Survey|ACS]] 5-year estimates]]
The 2020 census recorded a population of 25,698 in the county, with a population density of {{Pop density|25698|864.868204|sqmi|km2}}. 95.81% of the population reported being of one race. There were 10,818 housing units, of which 10,171 were occupied.<ref name=cen2020/>
{| class="wikitable"
|+Plymouth County Racial Composition<ref>{{Cite web|title =P2 HISPANIC OR LATINO, AND NOT HISPANIC OR LATINO BY RACE – 2020: DEC Redistricting Data (PL 94-171) – Plymouth County, Iowa|url=https://data.census.gov/cedsci/table?q=Plymouth%20County,%20Iowa&t=Race%20and%20Ethnicity&tid=DECENNIALPL2020.P2}}</ref>
!Race
!Num.
!Perc.
|-
|[[White (U.S. Census)|White]] (NH)
|22,941
|89.3%
|-
|[[African American (U.S. Census)|Black or African American]] (NH)
|354
|1.4%
|-
|[[Native American (U.S. Census)|Native American]] (NH)
|48
|0.2%
|-
|[[Asian (U.S. Census)|Asian]] (NH)
|111
|0.43%
|-
|[[Pacific Islander (U.S. Census)|Pacific Islander]] (NH)
|117
|0.5%
|-
|[[Race (United States Census)|Other/Mixed]] (NH)
|631
|2.5%
|-
|[[Hispanic (U.S. Census)|Hispanic]] or [[Latino (U.S. Census)|Latino]]
|1,496
|6%
|}

===2010 census===
The 2010 census recorded a population of 24,986 in the county, with a population density of {{Pop density|24986|863.56|sqmi|km2}}. There were 10,550 housing units, of which 9,875 were occupied.<ref>{{cite web|url=https://www2.census.gov/library/publications/decennial/2010/cph-2/cph-2-17.pdf |archive-url=https://web.archive.org/web/20201016010401/https://www2.census.gov/library/publications/decennial/2010/cph-2/cph-2-17.pdf |archive-date=October 16, 2020 |url-status=live|title=Population & Housing Occupancy Status 2010|publisher=United States Census Bureau – American FactFinder|access-date=August 15, 2022}}</ref>

===2000 census===
As of the [[census]]<ref>{{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 24,849 people, 9,372 households, and 6,804 families in the county. The population density was {{convert|29|/mi2|/km2|disp=preunit|people&nbsp;|people}}. There were 9,880 housing units at an average density of {{convert|11|/mi2|/km2|disp=preunit|units&nbsp;|units|}}. The [[Race and ethnicity in the United States Census#2010 census|racial makeup]] of the county was 98.16% White, 0.29% Black or African American, 0.14% Native American, 0.27% Asian, 0.06% Pacific Islander, 0.46% from other races, and 0.62% from two or more races. 1.32% of the population were Hispanic or Latino of any race.

Of the 9,372 households 35.70% had children under the age of 18 living with them, 63.30% were married couples living together, 6.20% had a female householder with no husband present, and 27.40% were non-families. 24.00% of households were one person and 12.00% were one person aged 65 or older. The average household size was 2.61 and the average family size was 3.12.

The age distribution was 28.30% under the age of 18, 7.20% from 18 to 24, 26.40% from 25 to 44, 22.00% from 45 to 64, and 16.00% 65 or older. The median age was 38 years. For every 100 females there were 98.80 males. For every 100 females age 18 and over, there were 95.70 males.

The median household income was $41,638 and the median family income was $50,009. Males had a median income of $33,566 versus $22,558 for females. The per capita income for the county was $19,442. About 4.40% of families and 6.00% of the population were below the [[poverty line]], including 6.70% of those under age 18 and 6.40% of those age 65 or over.