LaSalle County, Illinois

LaSalle County
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 / 41.34389; -88.88583
Country	United States
State	Illinois
Founded	January 15, 1831
Named for	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.gov
[1][2]

LaSalle County is 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.^[3] Its county seat and largest city is Ottawa.^[4] 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.