| Mount Holly to Oerlinghausen | 4,334.31 mi (6,975.40 km) |
| Mount Holly to Oestrich-Winkel | 4,362.16 mi (7,020.22 km) |
| Mount Holly to Offenburg | 4,402.81 mi (7,085.64 km) |
| Mount Holly to Oftersheim | 4,403.82 mi (7,087.26 km) |
| Mount Holly to Ohrdruf | 4,447.85 mi (7,158.13 km) |
| Mount Holly to Ohringen | 4,446.20 mi (7,155.47 km) |
| Mount Holly to Olbernhau | 4,554.85 mi (7,330.32 km) |
| Mount Holly to Olching | 4,550.92 mi (7,323.99 km) |
| Mount Holly to Oldenburg | 4,285.10 mi (6,896.21 km) |
| Mount Holly to Oldenburg in Holstein | 4,354.10 mi (7,007.24 km) |
| Mount Holly to Olfen | 4,290.63 mi (6,905.10 km) |
| Mount Holly to Olpe | 4,327.37 mi (6,964.22 km) |
| Mount Holly to Olsberg | 4,344.06 mi (6,991.08 km) |
| Mount Holly to Oranienburg | 4,486.75 mi (7,220.72 km) |
| Mount Holly to Ortenberg | 4,394.74 mi (7,072.65 km) |
