| Westphalia to Oerlinghausen | 3,999.51 mi (6,436.59 km) |
| Westphalia to Oestrich-Winkel | 4,028.02 mi (6,482.47 km) |
| Westphalia to Offenburg | 4,069.47 mi (6,549.17 km) |
| Westphalia to Oftersheim | 4,069.88 mi (6,549.84 km) |
| Westphalia to Ohrdruf | 4,113.17 mi (6,619.51 km) |
| Westphalia to Ohringen | 4,112.22 mi (6,617.98 km) |
| Westphalia to Olbernhau | 4,220.03 mi (6,791.48 km) |
| Westphalia to Olching | 4,217.13 mi (6,786.81 km) |
| Westphalia to Oldenburg | 3,950.17 mi (6,357.18 km) |
| Westphalia to Oldenburg in Holstein | 4,019.23 mi (6,468.32 km) |
| Westphalia to Olfen | 3,955.96 mi (6,366.50 km) |
| Westphalia to Olpe | 3,992.86 mi (6,425.89 km) |
| Westphalia to Olsberg | 4,009.40 mi (6,452.51 km) |
| Westphalia to Oranienburg | 4,151.80 mi (6,681.67 km) |
| Westphalia to Ortenberg | 4,060.34 mi (6,534.49 km) |
