| Cal to Oerlinghausen | 1,385.43 mi (2,229.64 km) |
| Cal to Oestrich-Winkel | 1,336.25 mi (2,150.48 km) |
| Cal to Offenburg | 1,289.40 mi (2,075.08 km) |
| Cal to Oftersheim | 1,292.05 mi (2,079.36 km) |
| Cal to Ohrdruf | 1,267.10 mi (2,039.20 km) |
| Cal to Ohringen | 1,250.40 mi (2,012.33 km) |
| Cal to Olbernhau | 1,171.98 mi (1,886.12 km) |
| Cal to Olching | 1,143.90 mi (1,840.93 km) |
| Cal to Oldenburg | 1,449.12 mi (2,332.14 km) |
| Cal to Oldenburg in Holstein | 1,419.05 mi (2,283.74 km) |
| Cal to Olfen | 1,421.00 mi (2,286.87 km) |
| Cal to Olpe | 1,378.66 mi (2,218.74 km) |
| Cal to Olsberg | 1,367.58 mi (2,200.91 km) |
| Cal to Oranienburg | 1,275.16 mi (2,052.16 km) |
| Cal to Ortenberg | 1,309.05 mi (2,106.71 km) |
