| California to Oerlinghausen | 4,012.07 mi (6,456.80 km) |
| California to Oestrich-Winkel | 4,038.97 mi (6,500.10 km) |
| California to Offenburg | 4,079.26 mi (6,564.94 km) |
| California to Oftersheim | 4,080.49 mi (6,566.92 km) |
| California to Ohrdruf | 4,125.32 mi (6,639.06 km) |
| California to Ohringen | 4,122.91 mi (6,635.18 km) |
| California to Olbernhau | 4,232.63 mi (6,811.77 km) |
| California to Olching | 4,227.52 mi (6,803.53 km) |
| California to Oldenburg | 3,963.52 mi (6,378.67 km) |
| California to Oldenburg in Holstein | 4,033.93 mi (6,491.98 km) |
| California to Olfen | 3,968.08 mi (6,386.00 km) |
| California to Olpe | 4,004.54 mi (6,444.69 km) |
| California to Olsberg | 4,021.46 mi (6,471.92 km) |
| California to Oranienburg | 4,165.85 mi (6,704.28 km) |
| California to Ortenberg | 4,071.79 mi (6,552.91 km) |
