8 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Henrietta | 1 | 3,323 | 3,112 | 1.28% | 651 | 5.11 | City |
| Petrolia | 2 | 556 | 513 | 1.65% | 752 | 0.74 | City |
| Dean | 3 | 538 | 497 | 1.51% | 253 | 2.13 | City |
| Byers | 4 | 487 | 449 | 1.67% | 490 | 0.99 | City |
| Pleasant Valley | 5 | 358 | 358 | 0% | 138 | 2.60 | Town |
| Bellevue | 6 | 310 | 289 | 1.31% | 368 | 0.84 | City |
| Cashion Community | 7 | 296 | 286 | 0.68% | 156 | 1.90 | City |
| Jolly | 8 | 185 | 170 | 1.65% | 188 | 0.98 | City |
Henrietta is the largest city in Clay County, with a population of 3,323.
Jolly is the smallest city in Clay County.
There are 8 cities in Clay County, Texas.