Cities and Towns in LaSalle County, Illinois
Founded in 1831, LaSalle County is one of 102 counties in the state of Illinois. Historically, LaSalle County was formed from Putnam and Tazewell County. The city of Ottawa is the county seat. With FIPS code of 99, LaSalle County has a population of 108,965 and area of 1,135 square miles (2,940 km²).
List of all cities in LaSalle County, IL alphabetically
| City/Town | Postal Code | Area Code |
| Baker, IL | 60531 | 815/779 |
| Brickton, IL | 61350 | 815/779 |
| Cedar Point, IL | 61316 | 815/779 |
| Dana, IL | 61321 | 815/779 |
| Danway, IL | 61341 | 815/779 |
| Dayton, IL | 61350 | 815/779 |
| Dimmick, IL | 61301 | 815/779 |
| Earlville, IL | 60518 | 815/779 |
| Farm Ridge, IL | 61325 | 815/779 |
| Grand Ridge, IL | 61325 | 815/779 |
| Harding, IL | 60518 | 815/779 |
| Jonesville, IL | 61348 | 815/779 |
| Kangley, IL | 61364 | 815/779 |
| Kernan, IL | 61364 | 815/779 |
| La Salle, IL | 61301 | 815/779 |
| Leland, IL | 60531 | 815/779 |
| Leonore, IL | 61332 | 815/779 |
| Lostant, IL | 61334 | 815/779 |
| Lowell, IL | 61370 | 815/779 |
| Marseilles, IL | 61341 | 815/779 |
| Mendota, IL | 61342 | 815/779 |
| Meriden, IL | 61342 | 815/779 |
| Missal, IL | 61364 | 815/779 |
| Mount Palatine, IL | 61334 | 815/779 |
| Munster, IL | 61364 | 815/779 |
| Naplate, IL | 61350 | 815/779 |
| North Ottawa, IL | 61350 | 815/779 |
| North Utica, IL | 61373 | 815/779 |
| Norway, IL | 60551 | 815/779 |
| Oglesby, IL | 61348 | 815/779 |
| Ottawa, IL | 61350 | 815/779 |
| Peru, IL | 61354 | 815/779 |
| Piety Hill, IL | 61348 | 815/779 |
| Prairie Center, IL | 61350 | 815/779 |
| Ransom, IL | 60470 | 815/779 |
| Rockwell, IL | 61301 | 815/779 |
| Rollo, IL | 60518 | 815/779 |
| Rutland, IL | 61358 | 815/779 |
| Seneca, IL | 61360 | 815/779 |
| Serena, IL | 60549 | 815/779 |
| Sheridan, IL | 60551 | 815/779 |
| South Streator, IL | 61364 | 815/779 |
| Stavanger, IL | 61360 | 815/779 |
| Stoneyville, IL | 61350 | 815/779 |
| Streator, IL | 61364 | 815/779 |
| Streator East, IL | 61364 | 815/779 |
| Streator West, IL | 61364 | 815/779 |
| Tomahawk Bluff, IL | 61301 | 815/779 |
| Tonica, IL | 61370 | 815/779 |
| Triumph, IL | 61371 | 815/779 |
| Troy Grove, IL | 61372 | 815/779 |
| Utica, IL | 61373 | 815/779 |
| Vermilionville, IL | 61370 | 815/779 |
| Wedron, IL | 60557 | 815/779 |
| Woodland Addition, IL | 61350 | 815/779 |
