| Mercerville to Oerlinghausen | 3,850.19 mi (6,196.28 km) |
| Mercerville to Oestrich-Winkel | 3,878.55 mi (6,241.93 km) |
| Mercerville to Offenburg | 3,920.05 mi (6,308.71 km) |
| Mercerville to Oftersheim | 3,920.42 mi (6,309.30 km) |
| Mercerville to Ohrdruf | 3,963.79 mi (6,379.10 km) |
| Mercerville to Ohringen | 3,962.75 mi (6,377.44 km) |
| Mercerville to Olbernhau | 4,070.72 mi (6,551.19 km) |
| Mercerville to Olching | 4,067.67 mi (6,546.28 km) |
| Mercerville to Oldenburg | 3,801.01 mi (6,117.14 km) |
| Mercerville to Oldenburg in Holstein | 3,870.50 mi (6,228.97 km) |
| Mercerville to Olfen | 3,806.57 mi (6,126.09 km) |
| Mercerville to Olpe | 3,843.43 mi (6,185.40 km) |
| Mercerville to Olsberg | 3,860.01 mi (6,212.09 km) |
| Mercerville to Oranienburg | 4,002.84 mi (6,441.95 km) |
| Mercerville to Ortenberg | 3,910.90 mi (6,293.98 km) |
