| Heswall to Oberkirch | 587.92 mi (946.16 km) |
| Heswall to Obernburg am Main | 577.15 mi (928.83 km) |
| Heswall to Obernkirchen | 514.97 mi (828.76 km) |
| Heswall to Oberschleissheim | 728.44 mi (1,172.31 km) |
| Heswall to Oberstdorf | 715.70 mi (1,151.81 km) |
| Heswall to Obertraubling | 725.20 mi (1,167.09 km) |
| Heswall to Obertshausen | 557.59 mi (897.36 km) |
| Heswall to Oberursel | 543.13 mi (874.08 km) |
| Heswall to Ochsenfurt | 619.60 mi (997.16 km) |
| Heswall to Ochsenhausen | 675.12 mi (1,086.50 km) |
| Heswall to Ochtrup | 436.68 mi (702.77 km) |
| Heswall to Odenthal | 460.43 mi (740.99 km) |
| Heswall to Oelde | 482.89 mi (777.14 km) |
| Heswall to Oelsnitz | 680.05 mi (1,094.43 km) |
| Heswall to Oer-Erkenschwick | 450.33 mi (724.74 km) |
