| Sigmaringen to Oberkirch | 60.53 mi (97.41 km) |
| Sigmaringen to Obernburg am Main | 121.19 mi (195.03 km) |
| Sigmaringen to Obernkirchen | 288.82 mi (464.81 km) |
| Sigmaringen to Oberschleissheim | 108.89 mi (175.24 km) |
| Sigmaringen to Oberstdorf | 68.01 mi (109.46 km) |
| Sigmaringen to Obertraubling | 148.03 mi (238.23 km) |
| Sigmaringen to Obertshausen | 137.90 mi (221.93 km) |
| Sigmaringen to Oberursel | 149.07 mi (239.91 km) |
| Sigmaringen to Ochsenfurt | 114.72 mi (184.62 km) |
| Sigmaringen to Ochsenhausen | 33.79 mi (54.38 km) |
| Sigmaringen to Ochtrup | 298.36 mi (480.17 km) |
| Sigmaringen to Odenthal | 224.26 mi (360.92 km) |
| Sigmaringen to Oelde | 263.16 mi (423.52 km) |
| Sigmaringen to Oelsnitz | 208.82 mi (336.07 km) |
| Sigmaringen to Oer-Erkenschwick | 260.77 mi (419.67 km) |
