Founded in 1821, Fayette County is one of 102 counties in the state of Illinois. Historically, Fayette County was formed from Bond, Wayne, Clark, Jefferson, and Crawford County. The city of Vandalia is the county seat. With FIPS code of 51, Fayette County has a population of 21,384 and area of 716 square miles (1,854 km2).
List of all cities in Fayette County, IL alphabetically
| City/Town | Postal Code | Area Code |
| Augsburg, IL | 62885 | 618/730 |
| Bayle, IL | 62080 | 618/730 |
| Bear Grove, IL | 62471 | 618/730 |
| Bingham, IL | 62011 | 217 |
| Brownstown, IL | 62418 | 618/730 |
| Confidence, IL | 62418 | 618/730 |
| Farina, IL | 62838 | 618/730 |
| Frogtown, IL | 62880 | 618/730 |
| Hagarstown, IL | 62247 | 618/730 |
| Iola, IL | 62838 | 618/730 |
| Loogootee, IL | 62838 | 618/730 |
| 62857 | 618/730 | |
| Otego, IL | 62418 | 618/730 |
| Pittsburg, IL | 62471 | 618/730 |
| Ramsey, IL | 62080 | 618/730 |
| Saint Elmo, IL | 62458 | 618/730 |
| Saint James, IL | 62857 | 618/730 |
| Saint Paul, IL | 62880 | 618/730 |
| Saint Peter, IL | 62880 | 618/730 |
| Shafter, IL | 62471 | 618/730 |
| Shobonier, IL | 62885 | 618/730 |
| Stringtown, IL | 62885 | 618/730 |
| Vandalia, IL | 62471 | 618/730 |
| Vera, IL | 62080 | 618/730 |
| Wilberton, IL | 62885 | 618/730 |
| Woodyard, IL | 62885 | 618/730 |