| Cumberland to Olympia Heights (Florida) | 966.63 mi (1,555.64 km) |
| Cumberland to Omaha (Nebraska) | 914.46 mi (1,471.68 km) |
| Cumberland to On Top of the World Designated Place (Florida) | 755.72 mi (1,216.21 km) |
| Cumberland to Onalaska (Wisconsin) | 704.19 mi (1,133.29 km) |
| Cumberland to Oneida (New York) | 285.94 mi (460.18 km) |
| Cumberland to Oneonta (New York) | 272.94 mi (439.25 km) |
| Cumberland to Ontario (California) | 2,165.46 mi (3,484.97 km) |
| Cumberland to Ontario (Oregon) | 1,972.36 mi (3,174.21 km) |
| Cumberland to Opa-locka (Florida) | 954.08 mi (1,535.45 km) |
| Cumberland to Opelika (Alabama) | 607.54 mi (977.74 km) |
| Cumberland to Opelousas (Louisiana) | 980.39 mi (1,577.79 km) |
| Cumberland to Orange (California) | 2,183.00 mi (3,513.20 km) |
| Cumberland to Orange (Texas) | 1,072.83 mi (1,726.55 km) |
| Cumberland to Orange City (Florida) | 754.30 mi (1,213.93 km) |
| Cumberland to Orangeburg (South Carolina) | 441.28 mi (710.17 km) |
