| Nieuwpoort to Olympia Heights (Florida) | 4,563.72 mi (7,344.59 km) |
| Nieuwpoort to Omaha (Nebraska) | 4,409.64 mi (7,096.62 km) |
| Nieuwpoort to On Top of the World Designated Place (Florida) | 4,475.85 mi (7,203.19 km) |
| Nieuwpoort to Onalaska (Wisconsin) | 4,106.98 mi (6,609.55 km) |
| Nieuwpoort to Oneida (New York) | 3,552.04 mi (5,716.46 km) |
| Nieuwpoort to Oneonta (New York) | 3,554.88 mi (5,721.03 km) |
| Nieuwpoort to Ontario (California) | 5,530.68 mi (8,900.77 km) |
| Nieuwpoort to Ontario (Oregon) | 4,940.67 mi (7,951.23 km) |
| Nieuwpoort to Opa-locka (Florida) | 4,551.29 mi (7,324.59 km) |
| Nieuwpoort to Opelika (Alabama) | 4,426.39 mi (7,123.59 km) |
| Nieuwpoort to Opelousas (Louisiana) | 4,803.57 mi (7,730.61 km) |
| Nieuwpoort to Orange (California) | 5,551.06 mi (8,933.57 km) |
| Nieuwpoort to Orange (Texas) | 4,890.87 mi (7,871.10 km) |
| Nieuwpoort to Orange City (Florida) | 4,442.63 mi (7,149.72 km) |
| Nieuwpoort to Orangeburg (South Carolina) | 4,201.33 mi (6,761.38 km) |
