Cities and Towns in Jefferson County, Illinois
Founded in 1819, Jefferson County is one of 102 counties in the state of Illinois. Historically, Jefferson County was formed from Edwards and White County. The city of Mount Vernon is the county seat. With FIPS code of 81, Jefferson County has a population of 36,877 and area of 571 square miles (1,479 km²).
List of all cities in Jefferson County, IL alphabetically
| City/Town | Postal Code | Area Code |
| Bakerville, IL | 62864 | 618/730 |
| Belle Rive, IL | 62810 | 618/730 |
| Bluford, IL | 62814 | 618/730 |
| Bonnie, IL | 62816 | 618/730 |
| Boyd, IL | 62830 | 618/730 |
| Camp Ground, IL | 62864 | 618/730 |
| Divide, IL | 62889 | 618/730 |
| Dix, IL | 62830 | 618/730 |
| Dodds, IL | 62864 | 618/730 |
| Drivers, IL | 62898 | 618/730 |
| Grand Prairie, IL | 62898 | 618/730 |
| Idlewood, IL | 62864 | 618/730 |
| Ina, IL | 62846 | 618/730 |
| Marcoe, IL | 62864 | 618/730 |
| Marlow, IL | 62872 | 618/730 |
| Miller Lake, IL | 62864 | 618/730 |
| Moores Prairie, IL | 62810 | 618/730 |
| Mount Vernon, IL | 62864 | 618/730 |
| Mount Vernon Outland Airport, IL | 62864 | 618/730 |
| Nason, IL | 62866 | 618/730 |
| Opdyke, IL | 62872 | 618/730 |
| Roaches, IL | 62898 | 618/730 |
| Scheller, IL | 62883 | 618/730 |
| Spring Garden, IL | 62846 | 618/730 |
| Summersville, IL | 62864 | 618/730 |
| Texico, IL | 62889 | 618/730 |
| Waltonville, IL | 62894 | 618/730 |
| Woodlawn, IL | 62898 | 618/730 |
