Washington County, Illinois

Washington County is a located in the  of. As of, the population is 15,148. Its is.

Geography
According to the, the county has a total area of 1,461 (564 ). 1,457 km² (563 sq mi) of it is land and 4 km² (2 sq mi) of it (0.27%) is water.

Adjacent Counties

 * (north)
 * (northeast)
 * (east)
 * (south)
 * (southwest)
 * (west)

History
Washington County was formed in out of. It was named for. Despite its relative proximity to the Illinois suburbs of St. Louis, MO, the county is not considered part of the St. Louis metropolitan area, also known as the Metro-East.

Demographics
As of the of 2000, there were 15,148 people, 5,848 households, and 4,239 families residing in the county. The was 10/km² (27/sq mi). There were 6,385 housing units at an average density of 4/km² (11/sq mi). The racial makeup of the county was 98.58%, 0.33% or , 0.22% , 0.18% , 0.03% , 0.13% from , and 0.52% from two or more races. 0.71% of the population were or  of any race.

There were 5,848 households out of which 33.50% had children under the age of 18 living with them, 61.70% were living together, 7.10% had a female householder with no husband present, and 27.50% were non-families. 24.30% of all households were made up of individuals and 13.30% had someone living alone who was 65 years of age or older. The average household size was 2.55 and the average family size was 3.02.

In the county the population was spread out with 25.30% under the age of 18, 7.60% from 18 to 24, 27.30% from 25 to 44, 23.00% from 45 to 64, and 16.70% who were 65 years of age or older. The median age was 39 years. For every 100 females there were 97.60 males. For every 100 females age 18 and over, there were 95.50 males.

The median income for a household in the county was $40,932, and the median income for a family was $48,433. Males had a median income of $32,209 versus $22,151 for females. The for the county was $19,108. About 3.70% of families and 6.00% of the population were below the, including 6.00% of those under age 18 and 8.70% of those age 65 or over.