| Cal to Oberkirch | 1,285.25 mi (2,068.40 km) |
| Cal to Obernburg am Main | 1,286.93 mi (2,071.11 km) |
| Cal to Obernkirchen | 1,382.30 mi (2,224.60 km) |
| Cal to Oberschleissheim | 1,135.86 mi (1,827.99 km) |
| Cal to Oberstdorf | 1,159.70 mi (1,866.35 km) |
| Cal to Obertraubling | 1,140.00 mi (1,834.66 km) |
| Cal to Obertshausen | 1,306.78 mi (2,103.07 km) |
| Cal to Oberursel | 1,321.39 mi (2,126.58 km) |
| Cal to Ochsenfurt | 1,244.94 mi (2,003.54 km) |
| Cal to Ochsenhausen | 1,194.45 mi (1,922.28 km) |
| Cal to Ochtrup | 1,446.39 mi (2,327.74 km) |
| Cal to Odenthal | 1,405.83 mi (2,262.46 km) |
| Cal to Oelde | 1,398.18 mi (2,250.15 km) |
| Cal to Oelsnitz | 1,199.99 mi (1,931.20 km) |
| Cal to Oer-Erkenschwick | 1,423.00 mi (2,290.09 km) |
