Founded in 1907, McClain County is one of 77 counties in the state of Oklahoma. Historically, McClain County was formed from Choctaw Nation land. The city of Purcell is the county seat. With FIPS code of 87, McClain County has a population of 43,516 and area of 570 square miles (1,476 km2).
List of all cities in McClain County, OK alphabetically
| City/Town | Postal Code | Area Code |
| Blanchard, OK | 73010 | 405 |
| Byars, OK | 74831 | 405 |
| Dibble, OK | 73031 | 405 |
| Goldsby, OK | 73093 | 405 |
| Newcastle, OK | 73065 | 405 |
| Purcell, OK | 73080 | 405 |
| Washington, OK | 73093 | 405 |
| Wayne, OK | 73095 | 405 |