Johnson County, Illinois

Johnson County is a located in the  of. As of, the population is 12,878. Its is.

Geography
According to the, the county has a total area of 904 (349 ). 893 km² (345 sq mi) of it is land and 11 km² (4 sq mi) of it (1.22%) is water.

Adjacent Counties

 * - north
 * - northeast
 * - east
 * - southeast
 * - southwest
 * - west

History
Johnson County was organized in out of. It was named for, who was then a U.S. Congressman from. In, Johnson commanded a Kentucky regiment at the , after which he claimed to have killed in hand to hand combat. Johnson went on to be.

Demographics
As of the of 2000, there were 12,878 people, 4,183 households, and 3,053 families residing in the county. The was 14/km² (37/sq mi). There were 5,046 housing units at an average density of 6/km² (15/sq mi). The racial makeup of the county was 83.52%, 14.17% or , 0.27% , 0.13% , 0.04% , 1.07% from , and 0.79% from two or more races. 2.86% of the population were or  of any race.

There were 4,183 households out of which 30.60% had children under the age of 18 living with them, 62.30% were living together, 7.10% had a female householder with no husband present, and 27.00% were non-families. 24.20% of all households were made up of individuals and 12.10% had someone living alone who was 65 years of age or older. The average household size was 2.43 and the average family size was 2.87.

In the county the population was spread out with 18.30% under the age of 18, 11.40% from 18 to 24, 34.00% from 25 to 44, 22.70% from 45 to 64, and 13.60% who were 65 years of age or older. The median age was 37 years. For every 100 females there were 149.00 males. For every 100 females age 18 and over, there were 160.20 males.

The median income for a household in the county was $33,326, and the median income for a family was $40,275. Males had a median income of $29,415 versus $22,844 for females. The for the county was $17,990. About 8.10% of families and 11.30% of the population were below the, including 11.30% of those under age 18 and 11.50% of those age 65 or over.