Founded in Jan 3, 1809, Darke County is one of 88 counties in the state of Ohio. Historically, Darke County was formed from Miami County. The city of Greenville is the county seat. With FIPS code of 37, Darke County has a population of 51,597 and area of 599.80 square miles (1,553 km2).
List of all cities in Darke County, OH alphabetically
| City/Town | Postal Code | Area Code |
| Ansonia, OH | 45303 | 937 |
| Arcanum, OH | 45304 | 937 |
| Castine, OH | 45304 | 937 |
| Dayton, OH | 45390 | 937 |
| Gettysburg, OH | 45328 | 937 |
| Gordon, OH | 45304 | 937 |
| Greenville, OH | 45331 | 937 |
| Hollansburg, OH | 45332 | 937 |
| Ithaca, OH | 45304 | 937 |
| New Madison, OH | 45346 | 937 |
| New Weston, OH | 45348 | 937 |
| North Star, OH | 45350 | 419/567 |
| Osgood, OH | 45351 | 419/567 |
| Palestine, OH | 45352 | 937 |
| Pitsburg, OH | 45358 | 937 |
| Rossburg, OH | 45348 | 937 |
| 45362 | 937 | |
| Union City, OH | 45390 | 937 |
| Versailles, OH | 45380 | 937 |
| Yorkshire, OH | 45388 | 419/567 |