| Saarlouis to Oberkirch | 81.20 mi (130.68 km) |
| Saarlouis to Obernburg am Main | 113.07 mi (181.96 km) |
| Saarlouis to Obernkirchen | 228.51 mi (367.75 km) |
| Saarlouis to Oberschleissheim | 231.29 mi (372.23 km) |
| Saarlouis to Oberstdorf | 208.79 mi (336.01 km) |
| Saarlouis to Obertraubling | 245.99 mi (395.88 km) |
| Saarlouis to Obertshausen | 106.56 mi (171.49 km) |
| Saarlouis to Oberursel | 101.98 mi (164.13 km) |
| Saarlouis to Ochsenfurt | 150.64 mi (242.43 km) |
| Saarlouis to Ochsenhausen | 169.29 mi (272.45 km) |
| Saarlouis to Ochtrup | 200.53 mi (322.72 km) |
| Saarlouis to Odenthal | 119.71 mi (192.65 km) |
| Saarlouis to Oelde | 184.40 mi (296.77 km) |
| Saarlouis to Oelsnitz | 252.86 mi (406.93 km) |
| Saarlouis to Oer-Erkenschwick | 162.18 mi (261.00 km) |
