| Fort Drum to Oerlinghausen | 3,718.15 mi (5,983.78 km) |
| Fort Drum to Oestrich-Winkel | 3,756.38 mi (6,045.30 km) |
| Fort Drum to Offenburg | 3,804.97 mi (6,123.50 km) |
| Fort Drum to Oftersheim | 3,800.23 mi (6,115.89 km) |
| Fort Drum to Ohrdruf | 3,833.96 mi (6,170.16 km) |
| Fort Drum to Ohringen | 3,841.95 mi (6,183.02 km) |
| Fort Drum to Olbernhau | 3,937.79 mi (6,337.27 km) |
| Fort Drum to Olching | 3,948.40 mi (6,354.34 km) |
| Fort Drum to Oldenburg | 3,664.21 mi (5,896.98 km) |
| Fort Drum to Oldenburg in Holstein | 3,725.29 mi (5,995.27 km) |
| Fort Drum to Olfen | 3,677.38 mi (5,918.16 km) |
| Fort Drum to Olpe | 3,716.84 mi (5,981.68 km) |
| Fort Drum to Olsberg | 3,731.01 mi (6,004.48 km) |
| Fort Drum to Oranienburg | 3,861.25 mi (6,214.09 km) |
| Fort Drum to Ortenberg | 3,785.58 mi (6,092.30 km) |
