| Peer to Olympia Heights (Florida) | 4,677.77 mi (7,528.14 km) |
| Peer to Omaha (Nebraska) | 4,505.09 mi (7,250.25 km) |
| Peer to On Top of the World Designated Place (Florida) | 4,587.79 mi (7,383.34 km) |
| Peer to Onalaska (Wisconsin) | 4,203.36 mi (6,764.66 km) |
| Peer to Oneida (New York) | 3,658.26 mi (5,887.40 km) |
| Peer to Oneonta (New York) | 3,661.92 mi (5,893.29 km) |
| Peer to Ontario (California) | 5,613.66 mi (9,034.32 km) |
| Peer to Ontario (Oregon) | 5,015.71 mi (8,072.00 km) |
| Peer to Opa-locka (Florida) | 4,665.31 mi (7,508.09 km) |
| Peer to Opelika (Alabama) | 4,535.01 mi (7,298.40 km) |
| Peer to Opelousas (Louisiana) | 4,909.76 mi (7,901.49 km) |
| Peer to Orange (California) | 5,634.01 mi (9,067.06 km) |
| Peer to Orange (Texas) | 4,996.29 mi (8,040.75 km) |
| Peer to Orange City (Florida) | 4,555.06 mi (7,330.66 km) |
| Peer to Orangeburg (South Carolina) | 4,311.67 mi (6,938.96 km) |
