Founded in 1831, Audrain County is one of 114 counties in the state of Missouri. Historically, Audrain County was formed from Callaway, Monroe and Ralls counties. The city of Mexico is the county seat. With FIPS code of 7, Audrain County has a population of 24,982 and area of 693 square miles (1,795 km2).
List of all cities in Audrain County, MO alphabetically
| City/Town | Postal Code | Area Code |
| Benton City, MO | 65232 | 573 |
| Farber, MO | 63345 | 573 |
| Laddonia, MO | 63352 | 573 |
| Martinsburg, MO | 65264 | 573 |
| Mexico, MO | 65265 | 573 |
| Riversville, MO | 65265 | 573 |
| Rush Hill, MO | 65280 | 573 |
| Thompson, MO | 65285 | 573 |
| Vandalia, MO | 63382 | 573 |
| Vandiver Village, MO | 65265 | 573 |