37 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Colerain | 1 | 59,731 | 59,238 | 0.66% | 1,398 | 43 | Township |
| Richland | 2 | 14,338 | 14,636 | -0.38% | 246 | 58 | Township |
| Pease | 3 | 12,328 | 12,762 | -0.52% | 432 | 29 | Township |
| Pultney | 4 | 7,889 | 8,138 | -0.45% | 304 | 26 | Township |
| Martins Ferry | 5 | 6,003 | 6,236 | -0.78% | 2,579 | 2 | City |
| Mead | 6 | 5,250 | 5,407 | -0.42% | 165 | 32 | Township |
| St. Clairsville | 7 | 4,924 | 5,074 | -0.61% | 2,033 | 2 | City |
| Colerain | 8 | 4,062 | 4,196 | -0.49% | 164 | 25 | Township |
| Barnesville | 9 | 3,876 | 4,004 | -0.67% | 1,891 | 2 | Village |
| Bellaire | 10 | 3,716 | 3,860 | -0.77% | 2,248 | 2 | Village |
| Shadyside | 11 | 3,328 | 3,441 | -0.69% | 3,295 | 1 | Village |
| York | 12 | 2,238 | 2,305 | -0.49% | 88 | 26 | Township |
| Union | 13 | 2,228 | 2,294 | -0.4% | 64 | 35 | Township |
| Colerain | 14 | 1,953 | 1,990 | -0.46% | 55 | 35 | Township |
| Flushing | 15 | 1,883 | 1,942 | -0.42% | 67 | 28 | Township |
| Wheeling | 16 | 1,544 | 1,591 | -0.45% | 57 | 27 | Township |
| Bridgeport | 17 | 1,520 | 1,574 | -0.72% | 1,113 | 1 | Village |
| Powhatan Point | 18 | 1,403 | 1,452 | -0.71% | 954 | 1 | Village |
| Smith | 19 | 1,402 | 1,439 | -0.36% | 39 | 36 | Township |
| Wolfhurst | 20 | 1,303 | 1,165 | 0.39% | 2,692 | 0 | CDP |
| Bethesda | 21 | 1,177 | 1,209 | -0.59% | 1,886 | 1 | Village |
| Neffs | 22 | 1,118 | 1,008 | 0.72% | 280 | 4 | CDP |
| Flushing | 23 | 802 | 831 | -0.74% | 1,306 | 1 | Village |
| Lloydsville | 24 | 649 | 473 | 7.1% | 1,060 | 1 | CDP |
| Blaine | 25 | 562 | 451 | 7.05% | 795 | 1 | CDP |
| Brookside | 26 | 516 | 538 | -0.96% | 2,983 | 0 | Village |
| Washington | 27 | 494 | 512 | -0.8% | 14 | 35 | Township |
| Belmont | 28 | 398 | 415 | -1% | 1,496 | 0 | Village |
| Kirkwood | 29 | 373 | 382 | -0.27% | 11 | 35 | Township |
| Holloway | 30 | 322 | 331 | -0.62% | 339 | 1 | Village |
| Morristown | 31 | 236 | 245 | -0.84% | 375 | 1 | Village |
| Lansing | 32 | 198 | 496 | -12.78% | 705 | 0 | CDP |
| Bannock | 33 | 186 | 158 | -1.06% | 628 | 0 | CDP |
| Connorville | 34 | 132 | 227 | 6.45% | 316 | 0 | CDP |
| Wilson | 35 | 131 | 135 | -0.76% | 321 | 0 | Village |
| Glencoe | 36 | 62 | 67 | -21.52% | 51 | 1 | CDP |
| Lafferty | 37 | 48 | 96 | -26.15% | 51 | 1 | CDP |
Colerain is the largest city in Belmont County, with a population of 59,731.
Lafferty is the smallest city in Belmont County, with a population of 48.
There are 37 cities in Belmont County, Ohio.