LaSalle County, Illinois
LaSalle County | |
|---|---|
LaSalle County Courthouse, Ottawa, Illinois | |
Location within the U.S. state of Illinois | |
Illinois's location within the U.S. | |
| Coordinates: 41°20′38″N 88°53′9″W / 41.34389°N 88.88583°W | |
| Country | United States |
| State | Illinois |
| Founded | January 15, 1831 |
| Named after | René-Robert Cavelier, Sieur de La Salle |
| Seat | Ottawa |
| Largest city | Ottawa |
| Area | |
• Total | 1,148 sq mi (2,970 km2) |
| • Land | 1,135 sq mi (2,940 km2) |
| • Water | 13 sq mi (30 km2) 1.1% |
| Population (2020) | |
• Total | 109,658 |
• Estimate (2023) | 108,309 |
| • Density | 96/sq mi (37/km2) |
| Time zone | UTC−6 (Central) |
| • Summer (DST) | UTC−5 (CDT) |
| Congressional districts | 14th, 16th |
| Website | lasallecountyil |
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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.
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 river towns and vast expanses of farmland. The county lies at the intersection of the Chicago, Peoria, Quad Cities and Rockford television markets with all four regions broadcasting within its borders and having a strong influence on the area, despite the county being only 60 miles (97 km) southwest of Chicago.