| California to Oberkirch | 4,083.61 mi (6,571.94 km) |
| California to Obernburg am Main | 4,089.86 mi (6,582.00 km) |
| California to Obernkirchen | 4,021.63 mi (6,472.19 km) |
| California to Oberschleissheim | 4,236.27 mi (6,817.61 km) |
| California to Oberstdorf | 4,208.64 mi (6,773.16 km) |
| California to Obertraubling | 4,238.63 mi (6,821.42 km) |
| California to Obertshausen | 4,070.95 mi (6,551.56 km) |
| California to Oberursel | 4,056.75 mi (6,528.70 km) |
| California to Ochsenfurt | 4,132.88 mi (6,651.23 km) |
| California to Ochsenhausen | 4,174.74 mi (6,718.60 km) |
| California to Ochtrup | 3,947.81 mi (6,353.39 km) |
| California to Odenthal | 3,975.36 mi (6,397.73 km) |
| California to Oelde | 3,995.31 mi (6,429.83 km) |
| California to Oelsnitz | 4,194.29 mi (6,750.05 km) |
| California to Oer-Erkenschwick | 3,964.76 mi (6,380.67 km) |
