13 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Killeen | 1 | 162,330 | 153,758 | 1.07% | 2,972 | 55 | City |
| Temple | 2 | 99,634 | 82,799 | 3.5% | 1,343 | 74 | City |
| Harker Heights | 3 | 35,770 | 33,234 | 1.44% | 2,289 | 16 | City |
| Belton | 4 | 26,261 | 23,128 | 2.44% | 1,298 | 20 | City |
| Nolanville | 5 | 7,749 | 5,979 | 4.79% | 1,587 | 5 | City |
| Morgan's Point Resort | 6 | 4,797 | 4,665 | 0.54% | 1,589 | 3 | City |
| Troy | 7 | 3,680 | 2,412 | 7.38% | 791 | 5 | City |
| Salado | 8 | 2,504 | 2,398 | 0.85% | 807 | 3 | Village |
| Little River-Academy | 9 | 2,033 | 1,990 | 0.4% | 1,064 | 2 | City |
| Bartlett | 10 | 1,686 | 1,633 | 0.6% | 1,363 | 1 | City |
| Holland | 11 | 1,141 | 1,078 | 1.06% | 694 | 2 | Town |
| Rogers | 12 | 1,097 | 1,107 | -0.18% | 1,063 | 1 | Town |
| South Mountain | 13 | 410 | 408 | 0% | 254 | 2 | Town |
Killeen is the largest city in Bell County, with a population of 162,330.
South Mountain is the smallest city in Bell County, with a population of 410.
There are 13 cities in Bell County, Texas.