| Dour to Olympia Heights (Florida) | 4,618.38 mi (7,432.56 km) |
| Dour to Omaha (Nebraska) | 4,474.92 mi (7,201.68 km) |
| Dour to On Top of the World Designated Place (Florida) | 4,533.05 mi (7,295.23 km) |
| Dour to Onalaska (Wisconsin) | 4,172.06 mi (6,714.28 km) |
| Dour to Oneida (New York) | 3,613.53 mi (5,815.41 km) |
| Dour to Oneonta (New York) | 3,615.91 mi (5,819.25 km) |
| Dour to Ontario (California) | 5,597.58 mi (9,008.43 km) |
| Dour to Ontario (Oregon) | 5,007.70 mi (8,059.11 km) |
| Dour to Opa-locka (Florida) | 4,606.00 mi (7,412.64 km) |
| Dour to Opelika (Alabama) | 4,486.34 mi (7,220.06 km) |
| Dour to Opelousas (Louisiana) | 4,864.97 mi (7,829.41 km) |
| Dour to Orange (California) | 5,617.96 mi (9,041.23 km) |
| Dour to Orange (Texas) | 4,952.67 mi (7,970.55 km) |
| Dour to Orange City (Florida) | 4,499.31 mi (7,240.95 km) |
| Dour to Orangeburg (South Carolina) | 4,260.00 mi (6,855.81 km) |
