13 cities
| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Killeen | 1 | 164,045 | 153,758 | 1.06% | 3,003 | 55 | City |
| Temple | 2 | 103,001 | 82,799 | 3.38% | 1,389 | 74 | City |
| Harker Heights | 3 | 36,277 | 33,234 | 1.42% | 2,322 | 16 | City |
| Belton | 4 | 26,888 | 23,128 | 2.39% | 1,329 | 20 | City |
| Nolanville | 5 | 8,103 | 5,979 | 4.57% | 1,660 | 5 | City |
| Morgan's Point Resort | 6 | 4,824 | 4,665 | 0.56% | 1,598 | 3 | City |
| Troy | 7 | 3,934 | 2,412 | 6.9% | 845 | 5 | City |
| Salado | 8 | 2,525 | 2,398 | 0.84% | 814 | 3 | Village |
| Little River-Academy | 9 | 2,042 | 1,990 | 0.44% | 1,069 | 2 | City |
| Bartlett | 10 | 1,697 | 1,633 | 0.65% | 1,372 | 1 | City |
| Holland | 11 | 1,154 | 1,078 | 1.14% | 702 | 2 | Town |
| Rogers | 12 | 1,095 | 1,107 | -0.18% | 1,061 | 1 | Town |
| South Mountain | 13 | 411 | 408 | 0.24% | 255 | 2 | Town |
Killeen is the largest city in Bell County, with a population of 164,045.
South Mountain is the smallest city in Bell County, with a population of 411.
There are 13 cities in Bell County, Texas.