| Serpa to Oerlinghausen | 1,247.54 mi (2,007.72 km) |
| Serpa to Oestrich-Winkel | 1,133.66 mi (1,824.45 km) |
| Serpa to Offenburg | 1,064.13 mi (1,712.55 km) |
| Serpa to Oftersheim | 1,125.83 mi (1,811.85 km) |
| Serpa to Ohrdruf | 1,262.87 mi (2,032.40 km) |
| Serpa to Ohringen | 1,151.54 mi (1,853.22 km) |
| Serpa to Olbernhau | 1,349.44 mi (2,171.72 km) |
| Serpa to Olching | 1,183.57 mi (1,904.77 km) |
| Serpa to Oldenburg | 1,293.16 mi (2,081.14 km) |
| Serpa to Oldenburg in Holstein | 1,426.25 mi (2,295.33 km) |
| Serpa to Olfen | 1,196.89 mi (1,926.22 km) |
| Serpa to Olpe | 1,176.00 mi (1,892.60 km) |
| Serpa to Olsberg | 1,212.26 mi (1,950.94 km) |
| Serpa to Oranienburg | 1,428.85 mi (2,299.52 km) |
| Serpa to Ortenberg | 1,185.10 mi (1,907.24 km) |
