| Glencullen to Oberkirch | 700.85 mi (1,127.91 km) |
| Glencullen to Obernburg am Main | 698.59 mi (1,124.27 km) |
| Glencullen to Obernkirchen | 643.51 mi (1,035.62 km) |
| Glencullen to Oberschleissheim | 847.19 mi (1,363.43 km) |
| Glencullen to Oberstdorf | 828.47 mi (1,333.29 km) |
| Glencullen to Obertraubling | 847.28 mi (1,363.57 km) |
| Glencullen to Obertshausen | 679.56 mi (1,093.65 km) |
| Glencullen to Oberursel | 665.33 mi (1,070.75 km) |
| Glencullen to Ochsenfurt | 741.52 mi (1,193.37 km) |
| Glencullen to Ochsenhausen | 790.14 mi (1,271.61 km) |
| Glencullen to Ochtrup | 564.67 mi (908.75 km) |
| Glencullen to Odenthal | 584.44 mi (940.57 km) |
| Glencullen to Oelde | 610.38 mi (982.31 km) |
| Glencullen to Oelsnitz | 806.22 mi (1,297.49 km) |
| Glencullen to Oer-Erkenschwick | 576.80 mi (928.28 km) |
