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Hamilton County, Iowa facts for kids

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Hamilton County
Hamilton County Courthouse
Hamilton County Courthouse
Map of Iowa highlighting Hamilton County
Location within the U.S. state of Iowa
Map of the United States highlighting Iowa
Iowa's location within the U.S.
Country  United States
State  Iowa
Founded 1856
Seat Webster City
Largest city Webster City
Area
 • Total 578 sq mi (1,500 km2)
 • Land 577 sq mi (1,490 km2)
 • Water 0.8 sq mi (2 km2)  0.1%
Population
 (2020)
 • Total 15,039
 • Density 26.019/sq mi (10.046/km2)
Time zone UTC−6 (Central)
 • Summer (DST) UTC−5 (CDT)
Congressional district 4th

Hamilton County is a county located in the U.S. state of Iowa. As of the 2020 census, the population was 15,039. The county seat is Webster City. The county was named to honor William W. Hamilton, a President of the Iowa State Senate.

Geography

According to the U.S. Census Bureau, the county has a total area of 578 square miles (1,500 km2), of which 577 square miles (1,490 km2) is land and 0.8 square miles (2.1 km2) (0.1%) is water.

Major highways

Adjacent counties

Demographics

Historical population
Census Pop.
1860 1,699
1870 6,055 256.4%
1880 11,252 85.8%
1890 15,319 36.1%
1900 19,514 27.4%
1910 19,242 −1.4%
1920 19,531 1.5%
1930 20,978 7.4%
1940 19,922 −5.0%
1950 19,660 −1.3%
1960 20,032 1.9%
1970 18,383 −8.2%
1980 17,862 −2.8%
1990 16,071 −10.0%
2000 16,438 2.3%
2010 15,673 −4.7%
2020 15,039 −4.0%
U.S. Decennial Census
1790-1960 1900-1990
1990-2000 2010-2018
HamiltonCountyIowaPop2020
Population of Hamilton County from US census data

2020 census

The 2020 census recorded a population of 15,039 in the county, with a population density of 25.9672/sq mi (10.0260/km2). 94.75% of the population reported being of one race. 77.23% were non-Hispanic White, 0.68% were Black, 9.74% were Hispanic, 0.51% were Native American, 2.12% were Asian and 9.71% were some other race or more than one race. There were 7,037 housing units, of which 6,283 were occupied.

2010 census

The 2010 census recorded a population of 15,673 in the county, with a population density of 27.1780/sq mi (10.4935/km2). There were 7,219 housing units, of which 6,540 were occupied.

Communities

Population ranking

The population ranking of the following table is based on the 2010 census of Hamilton County.

county seat

Rank City/Town/etc. Municipal type Population (2010 Census)
1 Webster City City 8,070
2 Jewell Junction City 1,215
3 Stratford (partially in Webster County) City 743
4 Ellsworth City 531
5 Stanhope City 422
6 Williams City 344
7 Blairsburg City 215
8 Kamrar City 199
9 Randall City 173
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