| Okemos to Oerlinghausen | 4,100.27 mi (6,598.74 km) |
| Okemos to Oestrich-Winkel | 4,147.13 mi (6,674.16 km) |
| Okemos to Offenburg | 4,201.35 mi (6,761.43 km) |
| Okemos to Oftersheim | 4,192.49 mi (6,747.15 km) |
| Okemos to Ohrdruf | 4,217.60 mi (6,787.57 km) |
| Okemos to Ohringen | 4,233.51 mi (6,813.17 km) |
| Okemos to Olbernhau | 4,318.06 mi (6,949.24 km) |
| Okemos to Olching | 4,340.82 mi (6,985.87 km) |
| Okemos to Oldenburg | 4,042.05 mi (6,505.05 km) |
| Okemos to Oldenburg in Holstein | 4,094.23 mi (6,589.02 km) |
| Okemos to Olfen | 4,062.31 mi (6,537.66 km) |
| Okemos to Olpe | 4,103.93 mi (6,604.64 km) |
| Okemos to Olsberg | 4,115.87 mi (6,623.85 km) |
| Okemos to Oranienburg | 4,233.28 mi (6,812.81 km) |
| Okemos to Ortenberg | 4,173.49 mi (6,716.58 km) |
