Founded in Jun 7, 1807, Ashtabula County is one of 88 counties in the state of Ohio. Historically, Ashtabula County was formed from Trumbull and Geauga Counties. The city of Jefferson is the county seat. With FIPS code of 7, Ashtabula County has a population of 97,337 and area of 702.44 square miles (1,819 km2).
List of all cities in Ashtabula County, OH alphabetically
| City/Town | Postal Code | Area Code |
| Andover, OH | 44003 | 440 |
| Ashtabula, OH | 44004 | 440 |
| 44005 | 440 | |
| Austinburg, OH | 44010 | 440 |
| Cherry Valley, OH | 44003 | 440 |
| Conneaut, OH | 44030 | 440 |
| Conneaut Harbor, OH | 44030 | 440 |
| Dorset, OH | 44032 | 440 |
| East Ashtabula, OH | 44004 | 440 |
| East Conneaut, OH | 44030 | 440 |
| East Orwell, OH | 44076 | 440 |
| Edgewood, OH | 44004 | 440 |
| Farnham, OH | 44030 | 440 |
| Geneva, OH | 44041 | 440 |
| Geneva on the Lake, OH | 44041 | 440 |
| Hartsgrove, OH | 44085 | 440 |
| Jefferson, OH | 44047 | 440 |
| Kelloggsville, OH | 44030 | 440 |
| Kingsville, OH | 44048 | 440 |
| 44068 | 440 | |
| Lenox, OH | 44047 | 440 |
| Monroe Center, OH | 44030 | 440 |
| Monroe Township, OH | 44030 | 440 |
| New Lyme, OH | 44047 | 440 |
| 44085 | 440 | |
| North Kingsville, OH | 44068 | 440 |
| Orwell, OH | 44076 | 440 |
| Pierpont, OH | 44082 | 440 |
| Plymouth Township, OH | 44004 | 440 |
| Roaming Rock Shores, OH | 44085 | 440 |
| Roaming Shores, OH | 44084 | 440 |
| 44085 | 440 | |
| Rock Creek, OH | 44084 | 440 |
| Rome, OH | 44085 | 440 |
| Unionville, OH | 44088 | 440 |
| Wayne, OH | 44093 | 440 |
| West Andover, OH | 44003 | 440 |
| Williamsfield, OH | 44093 | 440 |
| Windsor, OH | 44099 | 440 |
| Windsor Mills, OH | 44099 | 440 |