37 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Colerain township | 1 | 58,698 | 59,232 | 0.08% | 1,373 | 42.74 | Township |
| Richland township | 2 | 14,183 | 14,640 | -0.84% | 243 | 58.30 | Township |
| Pease township | 3 | 12,189 | 12,760 | -1.02% | 427 | 28.54 | Township |
| Pultney township | 4 | 7,809 | 8,143 | -0.94% | 301 | 25.93 | Township |
| Martins Ferry | 5 | 5,969 | 6,236 | -0.88% | 2,564 | 2.33 | City |
| Mead township | 6 | 5,200 | 5,406 | -0.88% | 163 | 31.91 | Township |
| St. Clairsville | 7 | 4,902 | 5,079 | -0.71% | 2,024 | 2.42 | City |
| Colerain township | 8 | 4,028 | 4,199 | -0.93% | 162 | 24.81 | Township |
| Barnesville | 9 | 3,847 | 3,999 | -0.77% | 1,877 | 2.05 | Village |
| Bellaire | 10 | 3,697 | 3,862 | -0.88% | 2,237 | 1.65 | Village |
| Shadyside | 11 | 3,312 | 3,444 | -0.78% | 3,279 | 1.01 | Village |
| York township | 12 | 2,220 | 2,305 | -0.85% | 87 | 25.54 | Township |
| Union township | 13 | 2,211 | 2,296 | -0.85% | 64 | 34.72 | Township |
| Colerain township | 14 | 1,997 | 1,991 | 0.25% | 56 | 35.37 | Township |
| Flushing township | 15 | 1,863 | 1,940 | -0.9% | 67 | 27.99 | Township |
| Wheeling township | 16 | 1,531 | 1,590 | -0.84% | 57 | 26.89 | Township |
| Bridgeport | 17 | 1,508 | 1,572 | -0.85% | 1,104 | 1.37 | Village |
| Powhatan Point | 18 | 1,397 | 1,452 | -0.78% | 950 | 1.47 | Village |
| Smith township | 19 | 1,384 | 1,439 | -0.86% | 38 | 36.06 | Township |
| Wolfhurst | 20 | 1,303 | 1,165 | 0.39% | 2,692 | 0.48 | CDP |
| Bethesda | 21 | 1,168 | 1,205 | -0.6% | 1,872 | 0.62 | Village |
| Neffs | 22 | 1,118 | 1,008 | 0.72% | 280 | 3.99 | CDP |
| Flushing | 23 | 794 | 826 | -0.75% | 1,293 | 0.61 | Village |
| Lloydsville | 24 | 649 | 473 | 7.1% | 1,060 | 0.61 | CDP |
| Blaine | 25 | 562 | 451 | 7.05% | 795 | 0.71 | CDP |
| Brookside | 26 | 514 | 538 | -0.96% | 2,971 | 0.17 | Village |
| Washington township | 27 | 491 | 509 | -1.01% | 14 | 35.39 | Township |
| Belmont | 28 | 397 | 414 | -0.75% | 1,492 | 0.27 | Village |
| Kirkwood township | 29 | 368 | 382 | -1.08% | 10 | 35.32 | Township |
| Holloway | 30 | 321 | 331 | -0.62% | 338 | 0.95 | Village |
| Morristown | 31 | 236 | 245 | -0.84% | 375 | 0.63 | Village |
| Lansing | 32 | 198 | 496 | -12.78% | 705 | 0.28 | CDP |
| Bannock | 33 | 186 | 158 | -1.06% | 628 | 0.30 | CDP |
| Connorville | 34 | 132 | 227 | 6.45% | 316 | 0.42 | CDP |
| Wilson | 35 | 130 | 135 | -0.76% | 319 | 0.41 | Village |
| Glencoe | 36 | 62 | 67 | -21.52% | 51 | 1.22 | CDP |
| Lafferty | 37 | 48 | 96 | -26.15% | 51 | 0.94 | CDP |
Colerain township is the largest city in Belmont County, with a population of 58,698.
Lafferty is the smallest city in Belmont County.
There are 37 cities in Belmont County, Ohio.