| Opmeer to Oerlinghausen | 164.88 mi (265.34 km) |
| Opmeer to Oestrich-Winkel | 228.26 mi (367.35 km) |
| Opmeer to Offenburg | 320.37 mi (515.59 km) |
| Opmeer to Oftersheim | 278.95 mi (448.93 km) |
| Opmeer to Ohrdruf | 278.95 mi (448.93 km) |
| Opmeer to Ohringen | 312.45 mi (502.84 km) |
| Opmeer to Olbernhau | 385.34 mi (620.15 km) |
| Opmeer to Olching | 418.17 mi (672.98 km) |
| Opmeer to Oldenburg | 139.37 mi (224.29 km) |
| Opmeer to Oldenburg in Holstein | 267.63 mi (430.70 km) |
| Opmeer to Olfen | 123.40 mi (198.59 km) |
| Opmeer to Olpe | 169.28 mi (272.43 km) |
| Opmeer to Olsberg | 176.79 mi (284.52 km) |
| Opmeer to Oranienburg | 346.58 mi (557.77 km) |
| Opmeer to Ortenberg | 239.46 mi (385.37 km) |
