Editing Marshall County, Iowa (section)

==Demographics==
{{US Census population
|1850= 338
|1860= 6015
|1870= 17576
|1880= 23752
|1890= 25842
|1900= 29991
|1910= 30279
|1920= 32630
|1930= 33727
|1940= 35406
|1950= 35611
|1960= 37984
|1970= 41076
|1980= 41652
|1990= 38276
|2000= 39311
|2010= 40648
|2020= 40105
|estyear=2023
|estimate=40014
|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/19/19127.html |publisher=United States Census Bureau |access-date=July 20, 2014 |url-status=dead |archive-url=https://web.archive.org/web/20110607071809/http://quickfacts.census.gov/qfd/states/19/19127.html |archive-date=June 7, 2011 }}</ref>
}}
[[File:MarshallCountyIowaPop2020.png|thumb|right|Population of Marshall County from US census data]]

===2020 census===
[[File:MarsallCountyIA2022PopPyr.png|thumb|left|2022 US Census [[population pyramid]] for Marshall County from [[American Community Survey|ACS]] 5-year estimates]]
The 2020 census recorded a population of 40,105 in the county, with a population density of {{Pop density|40105|571.430778|sqmi|km2}}. 90.76% of the population reported being of one race. There were 16,745 housing units, of which 15,358 were occupied.<ref name=cen2020/>
{| class="wikitable"
|+Marshall 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) – Marshall County, Iowa|url=https://data.census.gov/cedsci/table?q=Marshall%20County,%20Iowa&t=Race%20and%20Ethnicity&tid=DECENNIALPL2020.P2}}</ref>
!Race
!Num.
!Perc.
|-
|[[White (U.S. Census)|White]] (NH)
|27,438
|68.42%
|-
|[[African American (U.S. Census)|Black or African American]] (NH)
|785
|2%
|-
|[[Native American (U.S. Census)|Native American]] (NH)
|153
|0.4%
|-
|[[Asian (U.S. Census)|Asian]] (NH)
|1,514
|3.8%
|-
|[[Pacific Islander (U.S. Census)|Pacific Islander]] (NH)
|33
|0.08%
|-
|[[Race (United States Census)|Other/Mixed]] (NH)
|1,042
|2.6%
|-
|[[Hispanic (U.S. Census)|Hispanic]] or [[Latino (U.S. Census)|Latino]]
|9,140
|22.8%
|}

===2010 census===
The 2010 census recorded a population of 40,648 in the county, with a population density of {{Pop density|40648|572.32|sqmi|km2}}. There were 16,831 housing units, of which 15,538 were occupied.<ref name="USCB">{{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===
At the [[2000 United States Census|2000 census]] there were 39,311 people, 15,338 households, and 10,460 families in the county. The population density was {{convert|69|/mi2|/km2|disp=preunit|people&nbsp;|people}}. There were 16,324 housing units at an average density of {{convert|28|/mi2|/km2|disp=preunit|units&nbsp;|units|}}. The [[Race and ethnicity in the United States Census#2000 census|racial makeup]] of the county was 90.44% [[Race (United States Census)|White]], 0.93% [[Race (United States Census)|Black]] or [[Race (United States Census)|African American]], 0.35% [[Race (United States Census)|Native American]], 0.78% [[Race (United States Census)|Asian]], 0.06% [[Race (United States Census)|Pacific Islander]], 6.03% from other races, and 1.42% from two or more races. 8.96%.<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> were [[Race (United States Census)|Hispanic]] or [[Race (United States Census)|Latino]] of any race.

Of the 15,338 households 31.10% had children under the age of 18 living with them, 55.40% were married couples living together, 9.30% had a female householder with no husband present, and 31.80% were non-families. 26.90% of households were one person and 12.20% were one person aged 65 or older. The average household size was 2.48 and the average family size was 3.00.

The age distribution was 25.30% under the age of 18, 8.10% from 18 to 24, 26.30% from 25 to 44, 23.90% from 45 to 64, and 16.40% 65 or older. The median age was 39 years. For every 100 females there were 99.20 males. For every 100 females age 18 and over, there were 96.50 males.

The median household income was $38,268 and the median family income was $46,627. Males had a median income of $33,809 versus $24,063 for females. The per capita income for the county was $19,176. About 7.10% of families and 10.20% of the population were below the [[poverty line]], including 14.30% of those under age 18 and 8.60% of those age 65 or over.