Calhoun County, Iowa

Calhoun County is located entirely within the Des Moines Lobe of the Western Corn Belt Plains ecoregion, as defined by the United States Environmental Protection Agency (EPA). One of the flattest regions in Iowa, the Des Moines Lobe ecoregion is a distinctive area naturally defined by Wisconsin glaciation but modified by humans for extensive agriculture. In general, the land is level to gently rolling with some areas of relief defined by glacial features like moraines, hummocky knobs, and kettles, and outwash deposits. The lobe does not have any loess deposits like the Loess Hills to the west.

The stream network is poorly developed and widely spaced, with major rivers carving valleys that are relatively deep and steep-sided. Almost all of the natural lakes of Iowa are found in the northern part of this region (the Iowa Great Lakes). Most of the region has been converted from wet prairie to agricultural use with substantial surface water drainage. Only a small fraction of the wetlands remain, and many natural lakes have been drained as a result of agricultural drainage projects via drainage tiles or ditches.[4]

• U.S. Highway 20
• Iowa Highway 4
• Iowa Highway 7
• Iowa Highway 175

• Pocahontas County (north)
• Webster County (east)
• Greene County (southeast)
• Carroll County (southwest)
• Sac County (west)

The 2020 census recorded a population of 9,927 in the county, with a population density of 17.3722/sq mi (6.7074/km²). 97.22% of the population reported being of one race. 91.88% were non-Hispanic White, 1.53% were Black, 2.38% were Hispanic, 0.24% were Native American, 0.26% were Asian, 0.08% were Native Hawaiian or Pacific Islander and 3.63% were some other race or more than one race. There were 4,771 housing units of which 4,070 were occupied.[1]

The 2010 census recorded a population of 9,670 in the county, with a population density of 16.96/sq mi (6.55/km²). There were 5,108 housing units, of which 4,242 were occupied.[10]

2000 Census Age Pyramid for Calhoun County

As of the census[11] of 2000, there were 11,115 people, 4,513 households, and 3,014 families residing in the county. The population density was 20 people per square mile (7.7 people/km²). There were 5,219 housing units at an average density of 9 units per square mile (3.5 units/km²). The racial makeup of the county was 98.06% White, 0.69% Black or African American, 0.20% Native American, 0.18% Asian, 0.01% Pacific Islander, 0.34% from other races, and 0.52% from two or more races. 0.90% of the population were Hispanic or Latino of any race.

There were 4,513 households, out of which 27.80% had children under the age of 18 living with them, 57.90% were married couples living together, 6.60% had a female householder with no husband present, and 33.20% were non-families. 30.50% of all households were made up of individuals, and 17.80% had someone living alone who was 65 years of age or older. The average household size was 2.31 and the average family size was 2.87.

In the county, the population was spread out, with 23.10% under the age of 18, 6.40% from 18 to 24, 24.80% from 25 to 44, 23.70% from 45 to 64, and 22.10% who were 65 years of age or older. The median age was 42 years. For every 100 females there were 98.10 males. For every 100 females age 18 and over, there were 97.60 males.

The median income for a household in the county was $33,286, and the median income for a family was $41,583. Males had a median income of $28,787 versus $20,095 for females. The per capita income for the county was $17,498. 10.10% of the population and 7.10% of families were below the poverty line. Out of the total population, 13.50% of those under the age of 18 and 8.50% of those 65 and older were living below the poverty line.

• Easley
• Knoke
• Sherwood
• Twin Lakes, a census-designated place

Calhoun County is divided into sixteen townships:

The population ranking of the following table is based on the 2020 census of Calhoun County.[1]

† county seat