Johnson County, Iowa

Johnson County is a located in the  of. As of 2000, the is 111,006. Its is, also home of the. Johnson County is one of the two counties that make up the Iowa City, Iowa. It is named for, the ninth.

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

Adjacent counties

 * (north)
 * (northeast)
 * &  (southeast)
 * (southwest)
 * (west)
 * (northwest)

Demographics
As of the of 2000, there were 111,006 people, 44,080 households, and 23,582 families residing in the county. The was 70/km² (181/sq mi). There were 45,831 housing units at an average density of 29/km² (75/sq mi). The racial makeup of the county was 90.13%, 2.90% or , 0.28% , 4.12% , 0.04% , 1.01% from , and 1.51% from two or more races. 2.51% of the population were or  of any race.

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

In the county the population was 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 were 65 years of age or older. The median age was 28 years. For every 100 females there were 99.10 males. For every 100 females age 18 and over, there were 97.30 males.

The median income for a household in the county was $40,060, and the median income for a family was $60,112. Males had a median income of $36,279 versus $29,793 for females. The for the county was $22,220. About 5.20% of families and 15.00% of the population were below the, including 8.10% of those under age 18 and 3.80% of those age 65 or over.

Notable natives

 * (1831-1916) early builder and farmer.