8 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Sealy | 1 | 7,517 | 6,832 | 1.86% | 641 | 12 | City |
| Bellville | 2 | 4,225 | 4,204 | 0.09% | 1,552 | 3 | City |
| Wallis | 3 | 1,381 | 1,301 | 1.17% | 924 | 1 | City |
| San Felipe | 4 | 733 | 688 | 1.24% | 88 | 8 | Town |
| Brazos Country | 5 | 509 | 513 | -0.2% | 261 | 2 | City |
| New Ulm | 6 | 455 | 318 | 7.06% | 85 | 5 | CDP |
| Industry | 7 | 292 | 266 | 1.74% | 274 | 1 | City |
| South Frydek | 8 | 222 | 209 | 1.37% | 125 | 2 | City |
Sealy is the largest city in Austin County, with a population of 7,517.
South Frydek is the smallest city in Austin County, with a population of 222.
There are 8 cities in Austin County, Texas.