Founded in 1907, Ellis County is one of 77 counties in the state of Oklahoma. Historically, Ellis County was formed from Roger Mills and Woodward counties. The city of Arnett is the county seat. With FIPS code of 45, Ellis County has a population of 3,762 and area of 1,229 square miles (3,183 km2).
List of all cities in Ellis County, OK alphabetically
| City/Town | Postal Code | Area Code |
| Arnett, OK | 73832 | 580 |
| Fargo, OK | 73840 | 580 |
| Gage, OK | 73843 | 580 |
| Harmon, OK | 73832 | 580 |
| Shattuck, OK | 73858 | 580 |