| Gilbert to Oerlinghausen | 5,534.50 mi (8,906.92 km) |
| Gilbert to Oestrich-Winkel | 5,605.68 mi (9,021.47 km) |
| Gilbert to Offenburg | 5,675.46 mi (9,133.78 km) |
| Gilbert to Oftersheim | 5,654.45 mi (9,099.96 km) |
| Gilbert to Ohrdruf | 5,653.23 mi (9,097.99 km) |
| Gilbert to Ohringen | 5,692.47 mi (9,161.15 km) |
| Gilbert to Olbernhau | 5,740.84 mi (9,238.99 km) |
| Gilbert to Olching | 5,799.97 mi (9,334.16 km) |
| Gilbert to Oldenburg | 5,465.33 mi (8,795.60 km) |
| Gilbert to Oldenburg in Holstein | 5,489.78 mi (8,834.94 km) |
| Gilbert to Olfen | 5,505.81 mi (8,860.74 km) |
| Gilbert to Olpe | 5,552.72 mi (8,936.24 km) |
| Gilbert to Olsberg | 5,557.78 mi (8,944.38 km) |
| Gilbert to Oranienburg | 5,633.66 mi (9,066.50 km) |
| Gilbert to Ortenberg | 5,622.98 mi (9,049.32 km) |
