| Simpelveld to Olympia Heights (Florida) | 4,705.15 mi (7,572.20 km) |
| Simpelveld to Omaha (Nebraska) | 4,535.90 mi (7,299.82 km) |
| Simpelveld to On Top of the World Designated Place (Florida) | 4,616.09 mi (7,428.87 km) |
| Simpelveld to Onalaska (Wisconsin) | 4,234.11 mi (6,814.15 km) |
| Simpelveld to Oneida (New York) | 3,687.97 mi (5,935.21 km) |
| Simpelveld to Oneonta (New York) | 3,691.48 mi (5,940.86 km) |
| Simpelveld to Ontario (California) | 5,644.57 mi (9,084.05 km) |
| Simpelveld to Ontario (Oregon) | 5,046.31 mi (8,121.26 km) |
| Simpelveld to Opa-locka (Florida) | 4,692.71 mi (7,552.18 km) |
| Simpelveld to Opelika (Alabama) | 4,564.25 mi (7,345.46 km) |
| Simpelveld to Opelousas (Louisiana) | 4,939.49 mi (7,949.34 km) |
| Simpelveld to Orange (California) | 5,664.91 mi (9,116.80 km) |
| Simpelveld to Orange (Texas) | 5,026.15 mi (8,088.81 km) |
| Simpelveld to Orange City (Florida) | 4,583.17 mi (7,375.90 km) |
| Simpelveld to Orangeburg (South Carolina) | 4,340.47 mi (6,985.31 km) |
