Lake County is a county in the northeastern corner of the U.S. state of Illinois. According to the 2010 census, it has a population of 703,462, making it the third-most populous county in Illinois. Its county seat is Waukegan. Originally part of McHenry County, the townships composing Lake County were carved out into a separate county in 1839. Lake County is one of the collar counties of the Chicago-Naperville-Elgin, IL-IN-WI Metropolitan Statistical Area. It is located along the shore of Lake Michigan
According to the U.S. Census Bureau, the county has a total area of 1,368 square miles (3,540 km²), of which 444 square miles (1,150 km²) is land and 935 square miles (2,420 km²) (67.6%) is water. It is the second-largest county in Illinois by total area. Most of the water is in Lake Michigan.
As of the 2010 United States Census, there were 703,462 people, 241,712 households, and 179,428 families residing in the county. The population density was 1,585.6 inhabitants per square mile (612.2/km²). There were 260,310 housing units at an average density of 586.7 per square mile (226.5/km²). The racial makeup of the county was 75.1% white, 7.0% black or African American, 6.3% Asian, 0.5% American Indian, 8.5% from other races, and 2.6% from two or more races. Those of Hispanic or Latino origin made up 19.9% of the population. In terms of ancestry, 20.5% were German, 12.9% were Irish, 9.4% were Polish, 6.9% were Italian, 6.5% were English, and 4.0% were American.
Of the 241,712 households, 40.8% had children under the age of 18 living with them, 59.6% were married couples living together, 10.4% had a female householder with no husband present, 25.8% were non-families, and 21.5% of all households were made up of individuals. The average household size was 2.82 and the average family size was 3.31. The median age was 36.7 years.
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