| Oklahoma City to Olympia Heights (Florida) | 1,220.41 mi (1,964.05 km) |
| Oklahoma City to Omaha (Nebraska) | 408.13 mi (656.82 km) |
| Oklahoma City to On Top of the World Designated Place (Florida) | 990.53 mi (1,594.10 km) |
| Oklahoma City to Onalaska (Wisconsin) | 671.04 mi (1,079.93 km) |
| Oklahoma City to Oneida (New York) | 1,276.63 mi (2,054.53 km) |
| Oklahoma City to Oneonta (New York) | 1,294.09 mi (2,082.64 km) |
| Oklahoma City to Ontario (California) | 1,142.91 mi (1,839.33 km) |
| Oklahoma City to Ontario (Oregon) | 1,186.73 mi (1,909.85 km) |
| Oklahoma City to Opa-locka (Florida) | 1,217.19 mi (1,958.88 km) |
| Oklahoma City to Opelika (Alabama) | 720.68 mi (1,159.82 km) |
| Oklahoma City to Opelousas (Louisiana) | 464.26 mi (747.15 km) |
| Oklahoma City to Orange (California) | 1,158.15 mi (1,863.86 km) |
| Oklahoma City to Orange (Texas) | 428.74 mi (689.98 km) |
| Oklahoma City to Orange City (Florida) | 1,048.71 mi (1,687.73 km) |
| Oklahoma City to Orangeburg (South Carolina) | 956.70 mi (1,539.65 km) |
