| Gallup to Oerlinghausen | 5,312.92 mi (8,550.31 km) |
| Gallup to Oestrich-Winkel | 5,382.39 mi (8,662.11 km) |
| Gallup to Offenburg | 5,451.15 mi (8,772.77 km) |
| Gallup to Oftersheim | 5,430.97 mi (8,740.30 km) |
| Gallup to Ohrdruf | 5,431.70 mi (8,741.48 km) |
| Gallup to Ohringen | 5,469.25 mi (8,801.90 km) |
| Gallup to Olbernhau | 5,520.45 mi (8,884.31 km) |
| Gallup to Olching | 5,576.86 mi (8,975.09 km) |
| Gallup to Oldenburg | 5,244.49 mi (8,440.18 km) |
| Gallup to Oldenburg in Holstein | 5,271.18 mi (8,483.14 km) |
| Gallup to Olfen | 5,283.49 mi (8,502.96 km) |
| Gallup to Olpe | 5,330.07 mi (8,577.92 km) |
| Gallup to Olsberg | 5,335.65 mi (8,586.90 km) |
| Gallup to Oranienburg | 5,414.92 mi (8,714.47 km) |
| Gallup to Ortenberg | 5,400.37 mi (8,691.06 km) |
