LaSalle County is a county located within the Fox Valley and Illinois River Valley regions of the U.S. state of Illinois. As of the 2020 Census, it had a population of 109,658. Its county seat and largest city is Ottawa. LaSalle County is part of the Ottawa, IL Micropolitan Statistical Area of Northern Illinois.
Country: United States
State: Illinois
Founded: January 15, 1831
Named for: René-Robert Cavelier, Sieur de La Salle
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