| Tucson Mountains to Oberkirch | 5,712.55 mi (9,193.45 km) |
| Tucson Mountains to Obernburg am Main | 5,687.29 mi (9,152.81 km) |
| Tucson Mountains to Obernkirchen | 5,573.55 mi (8,969.77 km) |
| Tucson Mountains to Oberschleissheim | 5,842.57 mi (9,402.70 km) |
| Tucson Mountains to Oberstdorf | 5,839.83 mi (9,398.30 km) |
| Tucson Mountains to Obertraubling | 5,827.43 mi (9,378.34 km) |
| Tucson Mountains to Obertshausen | 5,666.62 mi (9,119.54 km) |
| Tucson Mountains to Oberursel | 5,651.86 mi (9,095.80 km) |
| Tucson Mountains to Ochsenfurt | 5,726.51 mi (9,215.93 km) |
| Tucson Mountains to Ochsenhausen | 5,797.22 mi (9,329.72 km) |
| Tucson Mountains to Ochtrup | 5,515.29 mi (8,875.99 km) |
| Tucson Mountains to Odenthal | 5,565.93 mi (8,957.49 km) |
| Tucson Mountains to Oelde | 5,562.93 mi (8,952.67 km) |
| Tucson Mountains to Oelsnitz | 5,756.95 mi (9,264.91 km) |
| Tucson Mountains to Oer-Erkenschwick | 5,542.72 mi (8,920.15 km) |
