| Debar to Olympia Heights (Florida) | 5,579.87 mi (8,979.93 km) |
| Debar to Omaha (Nebraska) | 5,480.12 mi (8,819.41 km) |
| Debar to On Top of the World Designated Place (Florida) | 5,512.38 mi (8,871.32 km) |
| Debar to Onalaska (Wisconsin) | 5,178.03 mi (8,333.23 km) |
| Debar to Oneida (New York) | 4,615.96 mi (7,428.67 km) |
| Debar to Oneonta (New York) | 4,616.67 mi (7,429.81 km) |
| Debar to Ontario (California) | 6,578.79 mi (10,587.54 km) |
| Debar to Ontario (Oregon) | 5,965.53 mi (9,600.59 km) |
| Debar to Opa-locka (Florida) | 5,567.89 mi (8,960.66 km) |
| Debar to Opelika (Alabama) | 5,481.55 mi (8,821.71 km) |
| Debar to Opelousas (Louisiana) | 5,866.41 mi (9,441.08 km) |
| Debar to Orange (California) | 6,599.06 mi (10,620.16 km) |
| Debar to Orange (Texas) | 5,955.56 mi (9,584.55 km) |
| Debar to Orange City (Florida) | 5,475.40 mi (8,811.81 km) |
| Debar to Orangeburg (South Carolina) | 5,248.78 mi (8,447.10 km) |
