Founded in 1821, Greene County is one of 102 counties in the state of Illinois. Historically, Greene County was formed from Madison County. The city of Carrollton is the county seat. With FIPS code of 61, Greene County has a population of 11,843 and area of 543 square miles (1,406 km2).
List of all cities in Greene County, IL alphabetically
| City/Town | Postal Code | Area Code |
| Athensville, IL | 62082 | 217 |
| Barrow, IL | 62082 | 217 |
| Belltown, IL | 62092 | 217 |
| Carrollton, IL | 62016 | 217 |
| Drake, IL | 62092 | 217 |
| Eldred, IL | 62027 | 217 |
| Fayette, IL | 62044 | 217 |
| Greenfield, IL | 62044 | 217 |
| Hillview, IL | 62050 | 217 |
| Kane, IL | 62054 | 217 |
| Lake Centralia, IL | 62081 | 618/730 |
| Old Kane, IL | 62054 | 217 |
| Patterson, IL | 62078 | 217 |
| Rockbridge, IL | 62081 | 618/730 |
| Roodhouse, IL | 62082 | 217 |
| Walkerville, IL | 62092 | 217 |
| White Hall, IL | 62092 | 217 |
| Woodville, IL | 62027 | 217 |
| Wrights, IL | 62098 | 217 |