14 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Elgin | 1 | 13,976 | 9,796 | 6.36% | 2,052 | 6.81 | City |
| Bastrop | 2 | 12,934 | 9,796 | 5.1% | 1,402 | 9.22 | City |
| Hornsby Bend | 3 | 12,091 | 8,553 | 3.01% | 1,286 | 9.40 | CDP |
| Camp Swift | 4 | 7,039 | 6,529 | 0.61% | 583 | 12.08 | CDP |
| Cedar Creek | 5 | 4,938 | 3,427 | 7.16% | 274 | 18 | CDP |
| Wyldwood | 6 | 4,834 | 3,615 | 3.33% | 427 | 11.33 | CDP |
| Smithville | 7 | 4,242 | 3,952 | 1.39% | 1,045 | 4.06 | City |
| Circle D-KC Estates | 8 | 2,527 | 2,761 | 0.36% | 272 | 9.29 | CDP |
| Garfield | 9 | 2,094 | 2,506 | 1.26% | 175 | 11.98 | CDP |
| Rosanky | 10 | 1,859 | 1,225 | 7.15% | 91 | 20.41 | CDP |
| McDade | 11 | 1,540 | 1,285 | 3.84% | 377 | 4.09 | CDP |
| Red Rock | 12 | 841 | 402 | 7.13% | 186 | 4.52 | CDP |
| Webberville | 13 | 483 | 403 | 3.43% | 231 | 2.09 | Village |
| Paige | 14 | 215 | 18 | 6.97% | 100 | 2.15 | CDP |
Elgin is the largest city in Bastrop County, with a population of 13,976.
Paige is the smallest city in Bastrop County.
There are 14 cities in Bastrop County, Texas.