7 cities
| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Sealy | 1 | 7,916 | 6,826 | 2.35% | 675 | 12 | City |
| Bellville | 2 | 4,331 | 4,211 | 0.46% | 1,591 | 3 | City |
| Wallis | 3 | 1,392 | 1,296 | 1.16% | 931 | 1 | City |
| San Felipe | 4 | 731 | 688 | 0.97% | 87 | 8 | Town |
| Brazos Country | 5 | 531 | 516 | 0.57% | 272 | 2 | City |
| Industry | 6 | 302 | 266 | 2.03% | 283 | 1 | City |
| South Frydek | 7 | 229 | 210 | 1.33% | 129 | 2 | City |
Sealy is the largest city in Austin County, with a population of 7,916.
South Frydek is the smallest city in Austin County, with a population of 229.
There are 7 cities in Austin County, Texas.