| Tucson Mountains to Oerlinghausen | 5,573.22 mi (8,969.24 km) |
| Tucson Mountains to Oestrich-Winkel | 5,642.21 mi (9,080.25 km) |
| Tucson Mountains to Offenburg | 5,710.50 mi (9,190.16 km) |
| Tucson Mountains to Oftersheim | 5,690.71 mi (9,158.31 km) |
| Tucson Mountains to Ohrdruf | 5,692.02 mi (9,160.42 km) |
| Tucson Mountains to Ohringen | 5,729.09 mi (9,220.08 km) |
| Tucson Mountains to Olbernhau | 5,780.94 mi (9,303.52 km) |
| Tucson Mountains to Olching | 5,836.74 mi (9,393.32 km) |
| Tucson Mountains to Oldenburg | 5,504.92 mi (8,859.31 km) |
| Tucson Mountains to Oldenburg in Holstein | 5,531.75 mi (8,902.49 km) |
| Tucson Mountains to Olfen | 5,543.63 mi (8,921.61 km) |
| Tucson Mountains to Olpe | 5,590.11 mi (8,996.42 km) |
| Tucson Mountains to Olsberg | 5,595.83 mi (9,005.62 km) |
| Tucson Mountains to Oranienburg | 5,675.49 mi (9,133.82 km) |
| Tucson Mountains to Ortenberg | 5,660.42 mi (9,109.57 km) |
