| Calhoun to Oberkirch | 4,608.45 mi (7,416.59 km) |
| Calhoun to Obernburg am Main | 4,611.07 mi (7,420.80 km) |
| Calhoun to Obernkirchen | 4,536.59 mi (7,300.94 km) |
| Calhoun to Oberschleissheim | 4,759.26 mi (7,659.29 km) |
| Calhoun to Oberstdorf | 4,734.29 mi (7,619.10 km) |
| Calhoun to Obertraubling | 4,759.58 mi (7,659.81 km) |
| Calhoun to Obertshausen | 4,591.84 mi (7,389.85 km) |
| Calhoun to Oberursel | 4,577.49 mi (7,366.76 km) |
| Calhoun to Ochsenfurt | 4,653.86 mi (7,489.66 km) |
| Calhoun to Ochsenhausen | 4,699.28 mi (7,562.76 km) |
| Calhoun to Ochtrup | 4,464.38 mi (7,184.73 km) |
| Calhoun to Odenthal | 4,495.09 mi (7,234.14 km) |
| Calhoun to Oelde | 4,512.20 mi (7,261.69 km) |
| Calhoun to Oelsnitz | 4,711.74 mi (7,582.82 km) |
| Calhoun to Oer-Erkenschwick | 4,482.81 mi (7,214.39 km) |
