| Rorschach to Oberkirch | 98.59 mi (158.67 km) |
| Rorschach to Obernburg am Main | 164.79 mi (265.21 km) |
| Rorschach to Obernkirchen | 332.06 mi (534.40 km) |
| Rorschach to Oberschleissheim | 110.03 mi (177.08 km) |
| Rorschach to Oberstdorf | 36.63 mi (58.95 km) |
| Rorschach to Obertraubling | 160.62 mi (258.49 km) |
| Rorschach to Obertshausen | 182.19 mi (293.20 km) |
| Rorschach to Oberursel | 193.68 mi (311.70 km) |
| Rorschach to Ochsenfurt | 153.06 mi (246.33 km) |
| Rorschach to Ochsenhausen | 46.73 mi (75.20 km) |
| Rorschach to Ochtrup | 343.18 mi (552.29 km) |
| Rorschach to Odenthal | 268.81 mi (432.61 km) |
| Rorschach to Oelde | 307.67 mi (495.15 km) |
| Rorschach to Oelsnitz | 237.01 mi (381.43 km) |
| Rorschach to Oer-Erkenschwick | 305.57 mi (491.76 km) |
