According to the U.S. Census Bureau, the county has a total area of 702 square miles (1,820 km2), of which 697 square miles (1,810 km2) is land and 4.8 square miles (12 km2) (0.7%) is water.[6]
The 2020 census recorded a population of 14,582 in the county, with a population density of 20.7512/sq mi (8.01209/km2). 96.78% of the population reported being of one race. 93.46% were non-Hispanic White, 0.19% were Black, 2.01% were Hispanic, 0.20% were Native American, 0.34% were Asian, 0.02% were Native Hawaiian or Pacific Islander and 3.78% were some other race or more than one race. There were 6,665 housing units, of which 5,951 were occupied.[1]
2010 census
The 2010 census recorded a population of 14,928 in the county, with a population density of 21.4261/sq mi (8.2727/km2). There were 6,731 housing units, of which 5,987 were occupied.[13]
2000 census
As of the census[14] of 2000, there were 15,666 people, 6,115 households, and 4,304 families residing in the county. The population density was 22 people per square mile (8.5 people/km2). There were 6,602 housing units at an average density of 10 units per square mile (3.9 units/km2). The racial makeup of the county was 98.69% White, 0.08% Black or African American, 0.22% Native American, 0.16% Asian, 0.01% Pacific Islander, 0.20% from other races, and 0.64% from two or more races. 0.72% of the population were Hispanic or Latino of any race.
There were 6,115 households, out of which 32.30% had children under the age of 18 living with them, 59.30% were married couples living together, 7.60% had a female householder with no husband present, and 29.60% were non-families. 26.10% of all households were made up of individuals, and 13.70% had someone living alone who was 65 years of age or older. The average household size was 2.51 and the average family size was 3.02.
In the county, the population was spread out, with 26.20% under the age of 18, 6.80% from 18 to 24, 27.00% from 25 to 44, 22.30% from 45 to 64, and 17.70% who were 65 years of age or older. The median age was 39 years. For every 100 females there were 96.50 males. For every 100 females age 18 and over, there were 91.80 males.
The median income for a household in the county was $38,141, and the median income for a family was $44,586. Males had a median income of $30,000 versus $21,663 for females. The per capita income for the county was $17,662. About 5.00% of families and 7.10% of the population were below the poverty line, including 8.70% of those under age 18 and 8.70% of those age 65 or over.
Harrison County is strongly Republican in presidential elections. Only seven Democratic Party candidates have won the county from 1880 to the present, the most recent of whom was Lyndon B. Johnson in 1964.
United States presidential election results for Harrison County, Iowa[16]
