Founded on Feb 12, 1825, Clay County is one of 92 counties in the state of Indiana. Historically, Clay County was formed from Owen County, Putnam County, Sullivan County, and Vigo County. The city of Brazil is the county seat. With FIPS code of 21, Clay County has a population of 26,410 and area of 358 square miles (927 km2).
List of all cities in Clay County, IN alphabetically
| City/Town | Postal Code | Area Code |
| Alma Lake, IN | 47834 | 812 |
| Art, IN | 47834 | 812 |
| Ashboro, IN | 47840 | 812 |
| Asherville, IN | 47834 | 812 |
| Barrick Corner, IN | 47841 | 812 |
| Bee Ridge, IN | 47834 | 812 |
| Benwood, IN | 47834 | 812 |
| Billtown, IN | 47834 | 812 |
| Billville, IN | 47834 | 812 |
| Bowling Green, IN | 47833 | 812 |
| Brazil, IN | 47834 | 812 |
| Carbon, IN | 47837 | 812 |
| Cardonia, IN | 47834 | 812 |
| Centerpoint, IN | 47840 | 812 |
| Clay City, IN | 47841 | 812 |
| Cloverland, IN | 47834 | 812 |
| Coalmont, IN | 47845 | 812 |
| Cory, IN | 47846 | 812 |
| Dick Johnson, IN | 47834 | 812 |
| Harmony, IN | 47853 | 812 |
| Hoosierville, IN | 47834 | 812 |
| Knightsville, IN | 47857 | 812 |
| Lena, IN | 47834 | 812 |
| Martz, IN | 47841 | 812 |
| Perth, IN | 47837 | 812 |
| Pontiac, IN | 47837 | 812 |
| Prairie City, IN | 47834 | 812 |
| Rocky Fork Lake, IN | 47834 | 812 |
| Saline City, IN | 47840 | 812 |
| Smockville, IN | 47837 | 812 |
| Staunton, IN | 47881 | 812 |
| Stearleyville, IN | 47834 | 812 |
| Sugar Ridge, IN | 47840 | 812 |
| Turner, IN | 47834 | 812 |
| Wey Lake, IN | 47834 | 812 |