Winnebago County, Illinois

Winnebago County is a located in the  of. As of 2000, the population was 278,418. Its is.

Geography
According to the, the county has a total area of 1,345 (519 ). 1,331 km² (514 sq mi) of it is land and 14 km² (6 sq mi) of it (1.07%) is water.

Adjacent Counties

 * (north)
 * (east)
 * (southeast)
 * (south)
 * (west)
 * (northwest)

History
Winnebago County was formed in 1836 out of and. It was named for the of.

Demographics
As of the of 2000, there were 278,418 people, 107,980 households, and 73,642 families residing in the county. The was 209/km² (542/sq mi). There were 114,404 housing units at an average density of 86/km² (223/sq mi). The racial makeup of the county was 82.46%, 10.53% or , 0.29% , 1.72% , 0.04% , 3.11% from , and 1.86% from two or more races. 6.90% of the population were or  of any race.

There were 107,980 households out of which 32.90% had children under the age of 18 living with them, 52.30% were living together, 11.80% had a female householder with no husband present, and 31.80% were non-families. 26.30% of all households were made up of individuals and 9.60% had someone living alone who was 65 years of age or older. The average household size was 2.53 and the average family size was 3.06.

In the county the population was spread out with 26.40% under the age of 18, 8.40% from 18 to 24, 29.80% from 25 to 44, 22.70% from 45 to 64, and 12.70% who were 65 years of age or older. The median age was 36 years. For every 100 females there were 95.80 males. For every 100 females age 18 and over, there were 92.60 males.

The median income for a household in the county was $43,886, and the median income for a family was $52,456. Males had a median income of $40,289 versus $25,942 for females. The for the county was $21,194. About 6.90% of families and 9.60% of the population were below the, including 12.90% of those under age 18 and 6.80% of those age 65 or over.