19 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Terre Haute | 1 | 58,570 | 58,400 | 0.06% | 1,684 | 34.77 | City |
| Brazil township | 2 | 8,666 | 8,570 | 0.34% | 1,340 | 6.47 | Township |
| Brazil | 3 | 8,242 | 8,171 | 0.17% | 2,235 | 3.69 | City |
| Posey township | 4 | 4,064 | 4,053 | 0.12% | 116 | 35.06 | Township |
| Jackson township | 5 | 2,823 | 2,829 | 0.04% | 80 | 35.09 | Township |
| Harrison township | 6 | 2,186 | 2,165 | 0.28% | 35 | 62.26 | Township |
| Dick Johnson township | 7 | 1,340 | 1,328 | 0.22% | 62 | 21.46 | Township |
| Harmony township | 8 | 1,212 | 1,228 | -0.33% | 34 | 35.26 | Township |
| Sugar Ridge township | 9 | 912 | 921 | -0.11% | 33 | 27.72 | Township |
| Perry township | 10 | 907 | 914 | -0.11% | 20 | 44.57 | Township |
| Clay City | 11 | 891 | 878 | 0.34% | 1,653 | 0.54 | Town |
| Knightsville | 12 | 700 | 700 | 0% | 674 | 1.04 | Town |
| Harmony | 13 | 670 | 677 | -0.15% | 815 | 0.82 | Town |
| Harmony township | 14 | 504 | 517 | -0.4% | 24 | 20.65 | Township |
| Staunton | 15 | 470 | 470 | 0% | 1,437 | 0.33 | Town |
| Cass township | 16 | 341 | 342 | 0% | 28 | 12 | Township |
| Carbon | 17 | 263 | 260 | 0.38% | 1,765 | 0.15 | Town |
| Coalmont | 18 | 242 | 221 | -4.35% | 161 | 1.50 | CDP |
| Center Point | 19 | 210 | 214 | -0.47% | 284 | 0.74 | Town |
Terre Haute is the largest city in Clay County, with a population of 58,570.
Center Point is the smallest city in Clay County.
There are 19 cities in Clay County, Indiana.