| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density (/mi²) | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Goldthwaite | 1 | 1,786 | 1,727 | 0.68% | 885 | 2 | City |
| Mullin | 2 | 131 | 127 | 0.77% | 280 | 0 | Town |
Goldthwaite is the largest city in Mills County, with a population of 1,786.
Mullin is the smallest city in Mills County, with a population of 131.
There are 2 cities in Mills County, Texas.