| Imperial to Olympia Heights (Florida) | 2,168.87 mi (3,490.45 km) |
| Imperial to Omaha (Nebraska) | 1,219.64 mi (1,962.82 km) |
| Imperial to On Top of the World Designated Place (Florida) | 1,980.50 mi (3,187.30 km) |
| Imperial to Onalaska (Wisconsin) | 1,516.34 mi (2,440.32 km) |
| Imperial to Oneida (New York) | 2,262.23 mi (3,640.71 km) |
| Imperial to Oneonta (New York) | 2,289.40 mi (3,684.43 km) |
| Imperial to Ontario (California) | 143.65 mi (231.18 km) |
| Imperial to Ontario (Oregon) | 776.63 mi (1,249.87 km) |
| Imperial to Opa-locka (Florida) | 2,169.30 mi (3,491.15 km) |
| Imperial to Opelika (Alabama) | 1,748.63 mi (2,814.14 km) |
| Imperial to Opelousas (Louisiana) | 1,387.50 mi (2,232.96 km) |
| Imperial to Orange (California) | 145.99 mi (234.95 km) |
| Imperial to Orange (Texas) | 1,296.47 mi (2,086.46 km) |
| Imperial to Orange City (Florida) | 2,041.73 mi (3,285.85 km) |
| Imperial to Orangeburg (South Carolina) | 1,998.31 mi (3,215.97 km) |
