| Capital: | Steubenville |
|---|---|
| Origen y Formación del condado: | Washington County |
| Población: | 69,709 habitantes |
| Área: | 409 sq mi |
| Localización del condado dentro de Ohio: |
|
Localidades en Jefferson, Ohio
- Adena
- Amsterdam
- Bergholz
- Bloomingdale
- Brilliant
- Brush Creek Township Jefferson County
- Cross Creek Township Jefferson County
- Dillonvale Jefferson County
- East Springfield
- Empire
- Hammondsville
- Irondale
- Island Creek Township Jefferson County
- Knox Township Jefferson County
- Mingo Junction
- Mingo Junction
- Mount Pleasant
- New Alexandria
- Piney Fork
- Rayland
- Richmond
- Ross Township Jefferson County
- Smithfield
- Steubenville
- Stratton
- Tiltonsville
- Toronto
- Unionport
- Warren Township Jefferson County
- Wayne Township Jefferson County
- Wells Township Jefferson County
- Wintersville
- Wolf Run
- Yorkville