| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density (/mi²) | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Killeen | 1 | 163,533 | 153,785 | 1.02% | 2,994 | 55 | City |
| Temple | 2 | 101,765 | 82,837 | 3.41% | 1,372 | 74 | City |
| Harker Heights | 3 | 35,683 | 33,230 | 1.39% | 2,284 | 16 | City |
| Belton | 4 | 26,558 | 23,119 | 2.29% | 1,312 | 20 | City |
| Nolanville | 5 | 8,329 | 5,974 | 4.33% | 1,706 | 5 | City |
| Morgan's Point Resort | 6 | 4,768 | 4,671 | 0.46% | 1,580 | 3 | City |
| Troy | 7 | 3,840 | 2,413 | 7.11% | 825 | 5 | City |
| Salado | 8 | 2,584 | 2,391 | 0.74% | 833 | 3 | Village |
| Little River-Academy | 9 | 2,028 | 1,998 | 0.4% | 1,061 | 2 | City |
| Bartlett | 10 | 1,689 | 1,630 | 0.66% | 1,365 | 1 | City |
| Holland | 11 | 1,201 | 1,080 | 1.09% | 730 | 2 | Town |
| Rogers | 12 | 1,098 | 1,109 | -0.27% | 1,064 | 1 | Town |
| South Mountain | 13 | 409 | 407 | 0% | 254 | 2 | Town |
Killeen is the largest city in Bell County, with a population of 163,533.
South Mountain is the smallest city in Bell County, with a population of 409.
There are 13 cities in Bell County, Texas.