Founded in 1839, Brown County is one of 102 counties in the state of Illinois. Historically, Brown County was formed from Schuyler County. The city of Mount Sterling is the county seat. With FIPS code of 9, Brown County has a population of 6,421 and area of 305 square miles (790 km2).
List of all cities in Brown County, IL alphabetically
| City/Town | Postal Code | Area Code |
| Cooperstown, IL | 62353 | 217 |
| Hersman, IL | 62353 | 217 |
| Mount Sterling, IL | 62353 | 217 |
| Ripley, IL | 62353 | 217 |
| Timewell, IL | 62375 | 217 |
| Versailles, IL | 62378 | 217 |