Founded in Sep 7, 1801, Belmont County is one of 88 counties in the state of Ohio. Historically, Belmont County was formed from Jefferson and Washington Counties. The city of St. Clairsville is the county seat. With FIPS code of 13, Belmont County has a population of 65,849 and area of 537.35 square miles (1,392 km2).
List of all cities in Belmont County, OH alphabetically
| City/Town | Postal Code | Area Code |
| Alledonia, OH | 43902 | 740 |
| Armstrong Mills, OH | 43933 | 740 |
| Bannock, OH | 43972 | 740 |
| Barnesville, OH | 43713 | 740 |
| Barton, OH | 43905 | 740 |
| Bellaire, OH | 43906 | 740 |
| Belmont, OH | 43718 | 740 |
| Bethesda, OH | 43719 | 740 |
| Blaine, OH | 43909 | 740 |
| Blainesville, OH | 43937 | 740 |
| Bridgeport, OH | 43912 | 740 |
| Colerain, OH | 43916 | 740 |
| Dilles Bottom, OH | 43947 | 740 |
| Fairpoint, OH | 43927 | 740 |
| Flushing, OH | 43977 | 740 |
| Glencoe, OH | 43928 | 740 |
| Holloway, OH | 43985 | 740 |
| Jacobsburg, OH | 43933 | 740 |
| Lafferty, OH | 43951 | 740 |
| Lansing, OH | 43934 | 740 |
| Martins Ferry, OH | 43935 | 740 |
| Maynard, OH | 43937 | 740 |
| Morristown, OH | 43759 | 740 |
| Neffs, OH | 43940 | 740 |
| Piedmont, OH | 43983 | 740 |
| Powhatan Point, OH | 43942 | 740 |
| Saint Clairsville, OH | 43950 | 740 |
| Shadyside, OH | 43947 | 740 |
| Somerton, OH | 43713 | 740 |
| Stewartsville, OH | 43933 | 740 |
| Warnock, OH | 43967 | 740 |