23 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Martins Ferry | 1 | 5,969 | 6,236 | -0.88% | 2,564 | 2.33 | City |
| St. Clairsville | 2 | 4,902 | 5,079 | -0.71% | 2,024 | 2.42 | City |
| Barnesville | 3 | 3,847 | 3,999 | -0.77% | 1,877 | 2.05 | Village |
| Bellaire | 4 | 3,697 | 3,862 | -0.89% | 2,237 | 1.65 | Village |
| Shadyside | 5 | 3,312 | 3,444 | -0.78% | 3,279 | 1.01 | Village |
| Bridgeport | 6 | 1,508 | 1,572 | -0.85% | 1,104 | 1.37 | Village |
| Powhatan Point | 7 | 1,397 | 1,452 | -0.78% | 950 | 1.47 | Village |
| Wolfhurst | 8 | 1,303 | 1,165 | 0.39% | 2,692 | 0.48 | CDP |
| Bethesda | 9 | 1,168 | 1,205 | -0.6% | 1,872 | 0.62 | Village |
| Neffs | 10 | 1,118 | 1,008 | 0.72% | 280 | 3.99 | CDP |
| Flushing | 11 | 794 | 826 | -0.75% | 1,293 | 0.61 | Village |
| Lloydsville | 12 | 649 | 473 | 7.1% | 1,060 | 0.61 | CDP |
| Blaine | 13 | 562 | 451 | 7.05% | 795 | 0.71 | CDP |
| Brookside | 14 | 514 | 538 | -0.96% | 2,971 | 0.17 | Village |
| Belmont | 15 | 397 | 414 | -0.75% | 1,492 | 0.27 | Village |
| Holloway | 16 | 321 | 331 | -0.62% | 338 | 0.95 | Village |
| Morristown | 17 | 236 | 245 | -0.84% | 375 | 0.63 | Village |
| Lansing | 18 | 198 | 496 | -12.78% | 705 | 0.28 | CDP |
| Bannock | 19 | 186 | 158 | -1.06% | 628 | 0.30 | CDP |
| Connorville | 20 | 132 | 227 | 6.45% | 316 | 0.42 | CDP |
| Wilson | 21 | 130 | 135 | -0.76% | 319 | 0.41 | Village |
| Glencoe | 22 | 62 | 67 | -21.52% | 51 | 1.22 | CDP |
| Lafferty | 23 | 48 | 96 | -26.15% | 51 | 0.94 | CDP |
Martins Ferry is the largest city in Belmont County, with a population of 5,969.
Lafferty is the smallest city in Belmont County.
There are 23 cities in Belmont County, Ohio.