Founded in 1839, Lee County is one of 102 counties in the state of Illinois. Historically, Lee County was formed from Ogle County. The city of Dixon is the county seat. With FIPS code of 103, Lee County has a population of 34,049 and area of 724 square miles (1,875 km2).
List of all cities in Lee County, IL alphabetically
| City/Town | Postal Code | Area Code |
| Amboy, IL | 61310 | 815/779 |
| Ashton, IL | 61006 | 815/779 |
| Binghampton, IL | 61310 | 815/779 |
| Compton, IL | 61318 | 815/779 |
| Dixon, IL | 61021 | 815/779 |
| Eldena, IL | 61324 | 815/779 |
| Franklin Grove, IL | 61031 | 815/779 |
| Franklin Grv, IL | 61031 | 815/779 |
| Grand Detour, IL | 61021 | 815/779 |
| Harmon, IL | 61042 | 815/779 |
| Lee, IL | 60530 | 815/779 |
| Lee Center, IL | 61331 | 815/779 |
| Maytown, IL | 61310 | 815/779 |
| Nachusa, IL | 61057 | 815/779 |
| Nelson, IL | 61021 | 815/779 |
| Paw Paw, IL | 61353 | 815/779 |
| Prairieville, IL | 61021 | 815/779 |
| Scarboro, IL | 60553 | 815/779 |
| Shaws, IL | 61310 | 815/779 |
| Steward, IL | 60553 | 815/779 |
| Sublette, IL | 61367 | 815/779 |
| The Burg, IL | 61318 | 815/779 |
| Walton, IL | 61021 | 815/779 |
| West Brooklyn, IL | 61378 | 815/779 |