Kenosha County has traditionally attracted newcomers from suburban Chicago and in March 2008 the demographers of the Wisconsin Department of Administration reported that Kenosha County's improvements in roads, business's need for personnel and quality-of-life factors have contributed to a decades-long influx of Illinois transplants. For 2006-2007, Kenosha County had a net gain of 424 new residents. Even though Kenosha County is in Wisconsin, it is considered a part of the U.S. Census Bureau's Chicago Metropolitan Area. Although commercial development has been greatly on the rise in the last decade, Kenosha County is very dependent on the major nearby economy of Chicago.
There were 56,057 households out of which 34.80% had children under the age of 18 living with them, 52.70% were married couples living together, 11.50% had a female householder with no husband present, and 31.40% were non-families. 25.50% of all households were made up of individuals and 9.10% had someone living alone who was 65 years of age or older. The average household size was 2.60 and the average family size was 3.13.
In the county, the population was spread out with 27.10% under the age of 18, 9.40% from 18 to 24, 31.30% from 25 to 44, 20.70% from 45 to 64, and 11.50% who were 65 years of age or older. The median age was 35 years. For every 100 females there were 98.30 males. For every 100 females age 18 and over, there were 95.30 males.
The county legislature is known as the Board of Supervisors. It consists of 23 members each elected from single member districts. The county executive is elected in a spring countywide, non-partisan vote. The district attorney, treasurer, clerk and register of deeds are elected in fall countywide, partisan elections held in presidential years, while the sheriff and clerk of circuit court are elected in fall countywide, partisan elections held in gubernatorial years.
Forstall, Richard L. (editor) (1996). Population of states and counties of the United States: 1790 to 1990 : from the twenty-one decennial censuses. United States Department of Commerce, Bureau of the Census, Population Division. ISBN0-934213-48-8.