Founded in Feb 3, 1845, Wyandot County is one of 88 counties in the state of Ohio. Historically, Wyandot County was formed from Marion, Crawford, and Hardin Counties. The city of Upper Sandusky is the county seat. With FIPS code of 175, Wyandot County has a population of 21,708 and area of 405.61 square miles (1,051 km2).
List of all cities in Wyandot County, OH alphabetically
| City/Town | Postal Code | Area Code |
| Adrian, OH | 43316 | 419/567 |
| Belle Vernon, OH | 44882 | 419/567 |
| Benton, OH | 44882 | 419/567 |
| Carey, OH | 43316 | 419/567 |
| Deunquat, OH | 44882 | 419/567 |
| Edenville, OH | 44849 | 740 |
| Harpster, OH | 43323 | 740 |
| Kirby, OH | 43330 | 419/567 |
| Lemert, OH | 44882 | 419/567 |
| Little York, OH | 44849 | 740 |
| McCutchenville, OH | 44844 | 419/567 |
| Nevada, OH | 44849 | 740 |
| Plankton, OH | 44882 | 419/567 |
| Sycamore, OH | 44882 | 419/567 |
| Upper Sandusky, OH | 43351 | 419/567 |
| Wharton, OH | 43330 | 419/567 |
| 43359 | 419/567 | |
| Wyandot, OH | 44849 | 740 |