| Den Helder to Olympia Heights (Florida) | 4,620.26 mi (7,435.59 km) |
| Den Helder to Omaha (Nebraska) | 4,408.94 mi (7,095.51 km) |
| Den Helder to On Top of the World Designated Place (Florida) | 4,522.71 mi (7,278.60 km) |
| Den Helder to Onalaska (Wisconsin) | 4,108.54 mi (6,612.05 km) |
| Den Helder to Oneida (New York) | 3,579.56 mi (5,760.75 km) |
| Den Helder to Oneonta (New York) | 3,584.92 mi (5,769.37 km) |
| Den Helder to Ontario (California) | 5,504.55 mi (8,858.71 km) |
| Den Helder to Ontario (Oregon) | 4,901.09 mi (7,887.55 km) |
| Den Helder to Opa-locka (Florida) | 4,607.67 mi (7,415.33 km) |
| Den Helder to Opelika (Alabama) | 4,460.96 mi (7,179.22 km) |
| Den Helder to Opelousas (Louisiana) | 4,830.19 mi (7,773.45 km) |
| Den Helder to Orange (California) | 5,524.86 mi (8,891.40 km) |
| Den Helder to Orange (Texas) | 4,915.16 mi (7,910.19 km) |
| Den Helder to Orange City (Florida) | 4,491.59 mi (7,228.51 km) |
| Den Helder to Orangeburg (South Carolina) | 4,242.11 mi (6,827.02 km) |
