| Sligo to Oberkirch | 813.81 mi (1,309.71 km) |
| Sligo to Obernburg am Main | 806.15 mi (1,297.38 km) |
| Sligo to Obernkirchen | 738.33 mi (1,188.22 km) |
| Sligo to Oberschleissheim | 956.99 mi (1,540.13 km) |
| Sligo to Oberstdorf | 941.63 mi (1,515.40 km) |
| Sligo to Obertraubling | 954.23 mi (1,535.69 km) |
| Sligo to Obertshausen | 786.62 mi (1,265.95 km) |
| Sligo to Oberursel | 772.16 mi (1,242.67 km) |
| Sligo to Ochsenfurt | 848.64 mi (1,365.75 km) |
| Sligo to Ochsenhausen | 902.19 mi (1,451.94 km) |
| Sligo to Ochtrup | 662.13 mi (1,065.60 km) |
| Sligo to Odenthal | 689.31 mi (1,109.34 km) |
| Sligo to Oelde | 709.17 mi (1,141.30 km) |
| Sligo to Oelsnitz | 907.59 mi (1,460.62 km) |
| Sligo to Oer-Erkenschwick | 677.96 mi (1,091.08 km) |
