| Clarkston to Oerlinghausen | 4,535.84 mi (7,299.74 km) |
| Clarkston to Oestrich-Winkel | 4,565.95 mi (7,348.18 km) |
| Clarkston to Offenburg | 4,608.03 mi (7,415.92 km) |
| Clarkston to Oftersheim | 4,608.04 mi (7,415.93 km) |
| Clarkston to Ohrdruf | 4,649.98 mi (7,483.41 km) |
| Clarkston to Ohringen | 4,650.33 mi (7,483.98 km) |
| Clarkston to Olbernhau | 4,756.27 mi (7,654.48 km) |
| Clarkston to Olching | 4,755.41 mi (7,653.09 km) |
| Clarkston to Oldenburg | 4,485.41 mi (7,218.57 km) |
| Clarkston to Oldenburg in Holstein | 4,552.09 mi (7,325.88 km) |
| Clarkston to Olfen | 4,492.82 mi (7,230.50 km) |
| Clarkston to Olpe | 4,530.17 mi (7,290.61 km) |
| Clarkston to Olsberg | 4,546.32 mi (7,316.60 km) |
| Clarkston to Oranienburg | 4,685.84 mi (7,541.13 km) |
| Clarkston to Ortenberg | 4,597.87 mi (7,399.56 km) |
