| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density (/mi²) | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Henrietta | 1 | 3,292 | 3,102 | 1.04% | 645 | 5 | City |
| Petrolia | 2 | 539 | 511 | 0.94% | 729 | 1 | City |
| Dean | 3 | 527 | 493 | 1.15% | 248 | 2 | City |
| Byers | 4 | 474 | 446 | 1.07% | 477 | 1 | City |
| Pleasant Valley | 5 | 365 | 363 | -0.27% | 140 | 3 | Town |
| Cashion Community | 6 | 303 | 286 | 0.66% | 160 | 2 | City |
| Bellevue | 7 | 301 | 284 | 1.01% | 357 | 1 | City |
| Jolly | 8 | 169 | 162 | 0.6% | 172 | 1 | City |
Henrietta is the largest city in Clay County, with a population of 3,292.
Jolly is the smallest city in Clay County, with a population of 169.
There are 8 cities in Clay County, Texas.