Founded in 1827, Shelby County is one of 102 counties in the state of Illinois. Historically, Shelby County was formed from Fayette County. The city of Shelbyville is the county seat. With FIPS code of 173, Shelby County has a population of 20,789 and area of 758 square miles (1,963 km2).
List of all cities in Shelby County, IL alphabetically
| City/Town | Postal Code | Area Code |
| Beecher City, IL | 62444 | 217 |
| Bowling Green, IL | 62422 | 217 |
| Clarksburg, IL | 62565 | 217 |
| Cowden, IL | 62422 | 217 |
| 62438 | 217 | |
| Dollville, IL | 62571 | 217 |
| Duvall, IL | 62565 | 217 |
| Fancher, IL | 62444 | 217 |
| Findlay, IL | 62534 | 217 |
| Henton, IL | 62565 | 217 |
| Herborn, IL | 62465 | 217 |
| Herrick, IL | 62431 | 618/730 |
| Hinton, IL | 62571 | 217 |
| Kingman, IL | 62463 | 217 |
| Lakewood, IL | 62438 | 217 |
| Middlesworth, IL | 62565 | 217 |
| Mode, IL | 62444 | 217 |
| Oconee, IL | 62553 | 217 |
| Shelbyville, IL | 62565 | 217 |
| Sigel, IL | 62462 | 217 |
| Stewardson, IL | 62463 | 217 |
| Strasburg, IL | 62465 | 217 |
| Tower Hill, IL | 62571 | 217 |
| Westervelt, IL | 62565 | 217 |
| Windsor, IL | 61957 | 217 |
| Yantisville, IL | 62534 | 217 |