| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density (/mi²) | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Brazil | 1 | 8,358 | 8,158 | 0.18% | 2,267 | 4 | City |
| Clay City | 2 | 884 | 882 | 0% | 1,640 | 1 | Town |
| Knightsville | 3 | 669 | 695 | -0.59% | 645 | 1 | Town |
| Harmony | 4 | 666 | 676 | -0.3% | 810 | 1 | Town |
| Staunton | 5 | 466 | 470 | -0.21% | 1,425 | 0 | Town |
| Carbon | 6 | 250 | 254 | -0.4% | 1,678 | 0 | Town |
| Center Point | 7 | 205 | 211 | -0.49% | 277 | 1 | Town |
Brazil is the largest city in Clay County, with a population of 8,358.
Center Point is the smallest city in Clay County, with a population of 205.
There are 7 cities in Clay County, Indiana.