Founded in 1907, Marshall County is one of 77 counties in the state of Oklahoma. Historically, Marshall County was formed from Pickens County, Chickasaw Nation, Indian Territory. The city of Madill is the county seat. With FIPS code of 95, Marshall County has a population of 15,594 and area of 371 square miles (961 km2).
List of all cities in Marshall County, OK alphabetically
| City/Town | Postal Code | Area Code |
| Kingston, OK | 73439 | 580 |
| Lebanon, OK | 73440 | 580 |
| Madill, OK | 73446 | 580 |
| Mc Millan, OK | 73446 | 580 |
| Oakland, OK | 73446 | 580 |