Johnson County, Iowa

Geography According to the U.S. Census Bureau, the county has a total area of 1,614 km² (623 mi²). 1,592 km² (614 mi²) of it is land and 23 km² (9 mi²) of it is water. The total area is 1.42% water.

Demographics As of the census of 2000, there are 111,006 people, 44,080 households, and 23,582 families residing in the county. The population density is 70/km² (181/mi²). There are 45,831 housing units at an average density of 29/km² (75/mi²). The racial makeup of the county is 90.13% White, 2.90% African American, 0.28% Native American, 4.12% Asian, 0.04% Pacific Islander, 1.01% from other races, and 1.51% from two or more races. 2.51% of the population are Hispanic or Latino of any race.

There are 44,080 households out of which 26.50% have children under the age of 18 living with them, 43.90% are married couples living together, 6.80% have a female householder with no husband present, and 46.50% are non-families. 30.20% of all households are made up of individuals and 5.60% have someone living alone who is 65 years of age or older. The average household size is 2.34 and the average family size is 2.97.

In the county the population is spread out with 20.10% under the age of 18, 23.40% from 18 to 24, 30.80% from 25 to 44, 18.20% from 45 to 64, and 7.40% who are 65 years of age or older. The median age is 28 years. For every 100 females there are 99.10 males. For every 100 females age 18 and over, there are 97.30 males.

The median income for a household in the county is $40,060, and the median income for a family is $60,112. Males have a median income of $36,279 versus $29,793 for females. The per capita income for the county is $22,220. 15.00% of the population and 5.20% of families are below the poverty line. Out of the total people living in poverty, 8.10% are under the age of 18 and 3.80% are 65 or older.

Cities and Towns

• Coralville
• Hills
• Iowa City
• Lone Tree
• North Liberty
• Oxford
• Shueyville
• Solon
• Swisher
• Tiffin
• University Heights