8 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Henrietta | 1 | 3,269 | 3,106 | 0.99% | 640 | 5 | City |
| Petrolia | 2 | 542 | 514 | 0.93% | 733 | 1 | City |
| Dean | 3 | 527 | 495 | 1.15% | 248 | 2 | City |
| Byers | 4 | 481 | 451 | 1.26% | 484 | 1 | City |
| Pleasant Valley | 5 | 358 | 360 | -0.28% | 138 | 3 | Town |
| Bellevue | 6 | 301 | 284 | 1.01% | 357 | 1 | City |
| Cashion Community | 7 | 297 | 287 | 0.68% | 157 | 2 | City |
| Jolly | 8 | 182 | 172 | 1.11% | 185 | 1 | City |
Henrietta is the largest city in Clay County, with a population of 3,269.
Jolly is the smallest city in Clay County, with a population of 182.
There are 8 cities in Clay County, Texas.