LaSalle County is located in the North Central region of the U.S. state of Illinois; it has an estimated population of 111,241 as of 2014 and its county seat and largest city is Ottawa. LaSalle County is part of the Ottawa-Peru, IL Micropolitan Statistical Area, which is also included in the Chicago-Naperville, IL-IN-WI Combined Statistical Area. LaSalle County borders Woodford, Marshall, Putnam, Bureau, Livingston, Lee, DeKalb, Kendall, and Grundy counties. Though LaSalle County is in the Chicago media market, it retains a unique identity with a mix of pleasant river towns, and vast expanses of farmland. The county is at the intersection of the Chicago, Peoria, Quad Cities and Rockford television markets, with all four regions advertising (and businesses from the respective regions) and having a strong influence on the area such that despite the county's short distance from Chicago, approximately 60 miles (97 km). The county is part of the far southwestern reaches of the Chicago metropolitan area, and it is also part of the Fox Valley subregion and the larger Northern Illinois region.
According to the U.S. Census Bureau, the county has a total area of 1,148 square miles (2,970 km²), of which 1,135 square miles (2,940 km²) is land and 13 square miles (34 km²) (1.1%) is water. It is the second-largest county in Illinois by land area and the fourth-largest by total area.
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.
As of the 2010 United States Census, there were 113,924 people, 45,347 households, and 30,116 families residing in the county. The population density was 100.4 inhabitants per square mile (38.8/km²). There were 49,978 housing units at an average density of 44.0 per square mile (17.0/km²). The racial makeup of the county was 93.2% white, 1.9% black or African American, 0.7% Asian, 0.3% American Indian, 2.5% from other races, and 1.4% from two or more races. Those of Hispanic or Latino origin made up 8.0% of the population. In terms of ancestry, 33.7% were German, 19.0% were Irish, 9.8% were English, 9.2% were Italian, 7.8% were Polish, 6.0% were American, and 5.5% were Norwegian.
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