| Saarlouis to Oerlinghausen | 201.42 mi (324.16 km) |
| Saarlouis to Oestrich-Winkel | 73.17 mi (117.76 km) |
| Saarlouis to Offenburg | 79.61 mi (128.13 km) |
| Saarlouis to Oftersheim | 82.67 mi (133.05 km) |
| Saarlouis to Ohrdruf | 205.14 mi (330.14 km) |
| Saarlouis to Ohringen | 124.26 mi (199.98 km) |
| Saarlouis to Olbernhau | 306.82 mi (493.78 km) |
| Saarlouis to Olching | 221.81 mi (356.97 km) |
| Saarlouis to Oldenburg | 271.90 mi (437.58 km) |
| Saarlouis to Oldenburg in Holstein | 386.79 mi (622.48 km) |
| Saarlouis to Olfen | 168.14 mi (270.60 km) |
| Saarlouis to Olpe | 126.86 mi (204.17 km) |
| Saarlouis to Olsberg | 159.93 mi (257.38 km) |
| Saarlouis to Oranienburg | 368.33 mi (592.78 km) |
| Saarlouis to Ortenberg | 125.32 mi (201.69 km) |
