| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density (/mi²) | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| San Augustine | 1 | 1,824 | 1,913 | -0.82% | 387 | 5 | City |
| Broaddus | 2 | 176 | 186 | -1.12% | 472 | 0 | Town |
San Augustine is the largest city in San Augustine County, with a population of 1,824.
Broaddus is the smallest city in San Augustine County, with a population of 176.
There are 2 cities in San Augustine County, Texas.