8 cities
| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Henrietta | 1 | 3,302 | 3,106 | 1.01% | 647 | 5 | City |
| Petrolia | 2 | 548 | 514 | 1.11% | 742 | 1 | City |
| Dean | 3 | 534 | 495 | 1.33% | 251 | 2 | City |
| Byers | 4 | 487 | 451 | 1.25% | 490 | 1 | City |
| Pleasant Valley | 5 | 358 | 360 | 0% | 138 | 3 | Town |
| Bellevue | 6 | 305 | 284 | 1.33% | 362 | 1 | City |
| Cashion Community | 7 | 299 | 287 | 0.67% | 158 | 2 | City |
| Jolly | 8 | 184 | 172 | 1.1% | 187 | 1 | City |
Henrietta is the largest city in Clay County, with a population of 3,302.
Jolly is the smallest city in Clay County, with a population of 184.
There are 8 cities in Clay County, Texas.