Founded in 1907, Delaware County is one of 77 counties in the state of Oklahoma. Historically, Delaware County was formed from Delaware District of Cherokee Nation. The city of Jay is the county seat. With FIPS code of 41, Delaware County has a population of 41,000 and area of 741 square miles (1,919 km2).
List of all cities in Delaware County, OK alphabetically
| City/Town | Postal Code | Area Code |
| Colcord, OK | 74338 | 918 |
| Eucha, OK | 74342 | 918 |
| Grove, OK | 74344 | 918 |
| 74345 | 918 | |
| Jay, OK | 74346 | 918 |
| Kansas, OK | 74347 | 918 |
| Oaks, OK | 74359 | 918 |
| Twin Oaks, OK | 74368 | 918 |