LaSalle County is a county located in the U.S. state of Illinois. According to the 2010 census, it had a population of 113,924, which is an increase of 2.2% from 111,509 in 2000. Its county seat and largest city is Ottawa.LaSalle County is part of the Ottawa–Peru, IL Micropolitan 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.
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