| Middelkerke to Olympia Heights (Florida) | 4,565.68 mi (7,347.76 km) |
| Middelkerke to Omaha (Nebraska) | 4,409.48 mi (7,096.38 km) |
| Middelkerke to On Top of the World Designated Place (Florida) | 4,477.46 mi (7,205.77 km) |
| Middelkerke to Onalaska (Wisconsin) | 4,106.90 mi (6,609.41 km) |
| Middelkerke to Oneida (New York) | 3,552.90 mi (5,717.84 km) |
| Middelkerke to Oneonta (New York) | 3,555.83 mi (5,722.56 km) |
| Middelkerke to Ontario (California) | 5,529.63 mi (8,899.07 km) |
| Middelkerke to Ontario (Oregon) | 4,939.10 mi (7,948.72 km) |
| Middelkerke to Opa-locka (Florida) | 4,553.25 mi (7,327.75 km) |
| Middelkerke to Opelika (Alabama) | 4,427.54 mi (7,125.44 km) |
| Middelkerke to Opelousas (Louisiana) | 4,804.44 mi (7,732.00 km) |
| Middelkerke to Orange (California) | 5,550.00 mi (8,931.87 km) |
| Middelkerke to Orange (Texas) | 4,891.66 mi (7,872.36 km) |
| Middelkerke to Orange City (Florida) | 4,444.31 mi (7,152.42 km) |
| Middelkerke to Orangeburg (South Carolina) | 4,202.70 mi (6,763.59 km) |
