4 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Gilmer | 1 | 5,296 | 4,851 | 1.71% | 1,397 | 4 | City |
| Holly Lake Ranch | 2 | 2,460 | 2,507 | -0.85% | 284 | 9 | CDP |
| Big Sandy | 3 | 1,349 | 1,231 | 1.73% | 831 | 2 | Town |
| Ore City | 4 | 1,220 | 1,114 | 1.75% | 565 | 2 | City |
Gilmer is the largest city in Upshur County, with a population of 5,296.
Ore City is the smallest city in Upshur County, with a population of 1,220.
There are 4 cities in Upshur County, Texas.