Founded in 1890, Cleveland County is one of 77 counties in the state of Oklahoma. Historically, Cleveland County was formed from County 3 in Oklahoma Territory. The city of Norman is the county seat. With FIPS code of 27, Cleveland County has a population of 297,597 and area of 536 square miles (1,388 km2).
List of all cities in Cleveland County, OK alphabetically
| City/Town | Postal Code | Area Code |
| Del City, OK | 73165 | 405 |
| Lexington, OK | 73051 | 405 |
| Moore, OK | 73153 | 405 |
| 73160 | 405 | |
| 73170 | 405 | |
| Newalla, OK | 74857 | 405 |
| Noble, OK | 73068 | 405 |
| Norman, OK | 73019 | 405 |
| 73026 | 405 | |
| 73069 | 405 | |
| 73070 | 405 | |
| 73071 | 405 | |
| 73072 | 405 | |
| Oklahoma City, OK | 73153 | 405 |
| 73160 | 405 | |
| 73165 | 405 | |
| 73170 | 405 | |
| 73189 | 405 | |
| University of Ok, OK | 73019 | 405 |