| Gabrovo to Obernburg am Main | 907.27 mi (1,460.11 km) |
| Gabrovo to Obernkirchen | 992.62 mi (1,597.47 km) |
| Gabrovo to Oberschleissheim | 761.23 mi (1,225.08 km) |
| Gabrovo to Oberstdorf | 796.34 mi (1,281.59 km) |
| Gabrovo to Obertraubling | 758.71 mi (1,221.02 km) |
| Gabrovo to Obertshausen | 926.45 mi (1,490.98 km) |
| Gabrovo to Oberursel | 940.80 mi (1,514.08 km) |
| Gabrovo to Ochsenfurt | 864.44 mi (1,391.18 km) |
| Gabrovo to Ochsenhausen | 825.73 mi (1,328.89 km) |
| Gabrovo to Ochtrup | 1,059.27 mi (1,704.74 km) |
| Gabrovo to Odenthal | 1,023.59 mi (1,647.30 km) |
| Gabrovo to Oelde | 1,011.05 mi (1,627.14 km) |
| Gabrovo to Oelsnitz | 811.69 mi (1,306.30 km) |
| Gabrovo to Oer-Erkenschwick | 1,037.87 mi (1,670.30 km) |
| Gabrovo to Oerlinghausen | 997.17 mi (1,604.79 km) |
