Founded in 1893, Harper County is one of 77 counties in the state of Oklahoma. Historically, Harper County was formed from Woodward County. The city of Buffalo is the county seat. With FIPS code of 59, Harper County has a population of 3,180 and area of 1,039 square miles (2,691 km2).
List of all cities in Harper County, OK alphabetically
| City/Town | Postal Code | Area Code |
| Buffalo, OK | 73834 | 580 |
| Laverne, OK | 73848 | 580 |
| Logan, OK | 73848 | 580 |
| May, OK | 73851 | 580 |
| Rosston, OK | 73855 | 580 |
| Selman, OK | 73834 | 580 |