| Santa Eulalia del Rio to Oerlinghausen | 960.11 mi (1,545.14 km) |
| Santa Eulalia del Rio to Oestrich-Winkel | 824.35 mi (1,326.66 km) |
| Santa Eulalia del Rio to Offenburg | 728.28 mi (1,172.06 km) |
| Santa Eulalia del Rio to Oftersheim | 797.29 mi (1,283.11 km) |
| Santa Eulalia del Rio to Ohrdruf | 932.29 mi (1,500.38 km) |
| Santa Eulalia del Rio to Ohringen | 807.93 mi (1,300.23 km) |
| Santa Eulalia del Rio to Olbernhau | 990.28 mi (1,593.71 km) |
| Santa Eulalia del Rio to Olching | 801.80 mi (1,290.37 km) |
| Santa Eulalia del Rio to Oldenburg | 1,028.28 mi (1,654.86 km) |
| Santa Eulalia del Rio to Oldenburg in Holstein | 1,145.03 mi (1,842.75 km) |
| Santa Eulalia del Rio to Olfen | 923.66 mi (1,486.49 km) |
| Santa Eulalia del Rio to Olpe | 885.66 mi (1,425.33 km) |
| Santa Eulalia del Rio to Olsberg | 917.97 mi (1,477.33 km) |
| Santa Eulalia del Rio to Oranienburg | 1,102.35 mi (1,774.07 km) |
| Santa Eulalia del Rio to Ortenberg | 867.18 mi (1,395.60 km) |
