Iowa has 99 counties.
93.7% Trumpy white (68.3% of the vote in 2020) Cass County's population has decreased 39% since its 21,274 peak of 1900.
Sources: Wikipedia (1860-2020), U.S. CensuBureau (2022)
We Are Iowa, 8/13/2021
Iowa's population grew in pockets around the state’s largest cities over the past decade while 68 counties in rural areas lost population, according to U.S. Census data released Thursday.
The biggest population gainers were the counties around Des Moines in central Iowa, Cedar Rapids and Davenport in eastern Iowa, and Sioux City in the northwest.
The fastest-growing area in the state remained Dallas County, west of Des Moines, which grew 50.7% in the past decade to a population of 99,678 in 2020 from just over 66,000 in 2010.
The data shows four counties — Johnson, Polk, Warren and Story — grew by more than 10% and 26 counties increased by less than 10%. The remaining 68 counties lost population.
Statewide, Iowa's population increased by 4.7% to 3,190,369.
The state’s Hispanic or Latino population grew to 6.8% from 5% in 2010 and the Black population increased to 4.1% from 2.9%.
The white population in Iowa in 2020 was 82.7% of the population, down from 88.7% in 2010.
The least populous county is Adams County, in southwest Iowa, which has 3,704 people — a decline of 8.1 %, or 325 people, over the decade.
Polk County had the most people with 492,401, a 14.3% increase, or 61,761 people. It is also the most densely populated with 860.5 people per square mile.
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Adams County. (4/10/2023)
Appanoose County. (4/27/2023)
Audubon County. (4/10/2023)
Calhoun County. (4/20/2023)
Chickasaw County. (4/26/2023)
Cherokee County. (4/25/2023)
Clarke County. (4/19/2023)
Davis County. (4/17/2023)
Decatur County. (4/15/2023)
Emmet County. (4/17/2023)
Franklin County. (4/20/2021)
Fremont County. (4/11/2023)
Greene County. (4/16/2023)
Guthrie County. (4/21/2023)
Hancock County. (4/24/2023)
Howard County. (4/18/2023)
Humboldt County. (4/18/2023)
Ida County (4/13/2023)
Keokuk County. (4/20/2023)
Louisa County. (4/24/2023)
Lucas County. (4/15/2023)
Lyon County. (4/25/2023)
Mitchell County. (4/21/2023)
Monona County. (4/16/2023)
Monroe County. (4/15/2023)
Montgomery County. (4/21/2023)
Osceola County. (4/11/2023)
Palo Alto County. (4/16/2023)
Pocahontas County. (4/13/2023)
Ringgold County. (4/10/2023)
Sac County. (4/19/2023)
Shelby County. (4/25/2023)
Taylor County. (4/11/2023)
Union County. (4/26/2023)
Van Buren County. (4/13/2023)
Wayne County. (4/11/2023
Winnebago County. (4/24/2023)
Worth County. (4/14/2023)
Wright County. (4/27/2023)
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