Some of the cities, towns, and places in LaSalle County are Adams, Allen, Altmar, Baker, Blakes, Brookfield, Bruce, Catharine, Cedar Point, Dalzell, Dana, Danway, Dayton, Deer Park, Dimmick, Eagle, Earl, Earlville, East Wenona, Eden, Fall River, Farm Ridge, Fitchmoor, Freedom, Garfield, Grand Rapids, Grand Ridge, Groveland, Harding, Hitt, Hope, Jonesville, Kangley, Kernan, Lake Holiday, LaSalle, Leeds, Leland, Leonore, Little Rock, Lostant, Lowell, Manlius, Marseilles, Mendota, Meriden, Milla, Miller, Millington, Mission, Mount Palatine, Naplate, North Utica, Northville, Norway, Oglesby, Ophir, Osage, Ottawa, Otter Creek, Peru, Peterstown, Prairie Center, Ransom, Richards, Richland, Rutland, Sandwich, Science, Seneca, Serena, Sheridan, Somonauk, South Ottawa, Stavanger, Streator, Sulphur Springs, Ticona, Tonica, Triumph, Troy Grove, Utica, Vermillion, Wallace, Waltham, Wedron, Welland, Wenona, Wilsman
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. 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.