| California to Opwijk | 3,858.40 mi (6,209.50 km) |
| California to Ostend | 3,800.75 mi (6,116.72 km) |
| California to Oud-Heverlee | 3,881.37 mi (6,246.46 km) |
| California to Oud-Turnhout | 3,882.25 mi (6,247.88 km) |
| California to Oudenaarde | 3,837.42 mi (6,175.73 km) |
| California to Oudenburg | 3,805.02 mi (6,123.59 km) |
| California to Oupeye | 3,924.25 mi (6,315.46 km) |
| California to Overijse | 3,877.17 mi (6,239.70 km) |
| California to Overpelt | 3,902.22 mi (6,280.01 km) |
| California to Paal | 3,896.80 mi (6,271.29 km) |
| California to Peer | 3,905.81 mi (6,285.80 km) |
| California to Pepinster | 3,934.94 mi (6,332.68 km) |
| California to Peruwelz | 3,844.77 mi (6,187.57 km) |
| California to Perwez | 3,892.63 mi (6,264.58 km) |
| California to Philippeville | 3,892.39 mi (6,264.20 km) |
