| Fort Oglethorpe to Oerlinghausen | 4,517.56 mi (7,270.31 km) |
| Fort Oglethorpe to Oestrich-Winkel | 4,551.22 mi (7,324.48 km) |
| Fort Oglethorpe to Offenburg | 4,595.85 mi (7,396.30 km) |
| Fort Oglethorpe to Oftersheim | 4,594.04 mi (7,393.39 km) |
| Fort Oglethorpe to Ohrdruf | 4,632.51 mi (7,455.31 km) |
| Fort Oglethorpe to Ohringen | 4,636.12 mi (7,461.11 km) |
| Fort Oglethorpe to Olbernhau | 4,737.69 mi (7,624.58 km) |
| Fort Oglethorpe to Olching | 4,741.80 mi (7,631.19 km) |
| Fort Oglethorpe to Oldenburg | 4,465.39 mi (7,186.35 km) |
| Fort Oglethorpe to Oldenburg in Holstein | 4,528.98 mi (7,288.69 km) |
| Fort Oglethorpe to Olfen | 4,475.55 mi (7,202.70 km) |
| Fort Oglethorpe to Olpe | 4,513.85 mi (7,264.34 km) |
| Fort Oglethorpe to Olsberg | 4,529.13 mi (7,288.94 km) |
| Fort Oglethorpe to Oranienburg | 4,664.06 mi (7,506.07 km) |
| Fort Oglethorpe to Ortenberg | 4,582.03 mi (7,374.06 km) |
