Lee County is a county located in the U.S. state of Illinois. According to the 2010 census, it has a population of 36,031. Its county seat is Dixon. The Dixon, IL Micropolitan Statistical Area includes all of Lee County.
According to the U.S. Census Bureau, the county has a total area of 729 square miles (1,890 km²), of which 725 square miles (1,880 km²) is land and 4.1 square miles (11 km²) (0.6%) is water.
As of the 2010 United States Census, there were 36,031 people, 13,758 households, and 9,064 families residing in the county. The population density was 49.7 inhabitants per square mile (19.2/km²). There were 15,049 housing units at an average density of 20.8 per square mile (8.0/km²). The racial makeup of the county was 90.9% white, 4.8% black or African American, 0.7% Asian, 0.2% American Indian, 1.9% from other races, and 1.5% from two or more races. Those of Hispanic or Latino origin made up 5.0% of the population. In terms of ancestry, 38.0% were German, 18.8% were Irish, 8.4% were English, and 8.2% were American.
Of the 13,758 households, 30.0% had children under the age of 18 living with them, 51.2% were married couples living together, 10.0% had a female householder with no husband present, 34.1% were non-families, and 28.8% of all households were made up of individuals. The average household size was 2.41 and the average family size was 2.94. The median age was 42.0 years.
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