| Grand Haven to Oerlinghausen | 4,148.42 mi (6,676.24 km) |
| Grand Haven to Oestrich-Winkel | 4,198.34 mi (6,756.57 km) |
| Grand Haven to Offenburg | 4,254.63 mi (6,847.16 km) |
| Grand Haven to Oftersheim | 4,244.21 mi (6,830.39 km) |
| Grand Haven to Ohrdruf | 4,266.16 mi (6,865.72 km) |
| Grand Haven to Ohringen | 4,284.93 mi (6,895.93 km) |
| Grand Haven to Olbernhau | 4,365.32 mi (7,025.31 km) |
| Grand Haven to Olching | 4,392.46 mi (7,068.98 km) |
| Grand Haven to Oldenburg | 4,088.78 mi (6,580.25 km) |
| Grand Haven to Oldenburg in Holstein | 4,137.89 mi (6,659.29 km) |
| Grand Haven to Olfen | 4,111.50 mi (6,616.82 km) |
| Grand Haven to Olpe | 4,153.85 mi (6,684.98 km) |
| Grand Haven to Olsberg | 4,164.98 mi (6,702.88 km) |
| Grand Haven to Oranienburg | 4,277.82 mi (6,884.48 km) |
| Grand Haven to Ortenberg | 4,223.63 mi (6,797.28 km) |
