| Donegal to Oschatz | 908.73 mi (1,462.46 km) |
| Donegal to Oschersleben | 816.44 mi (1,313.93 km) |
| Donegal to Osnabruck | 682.84 mi (1,098.93 km) |
| Donegal to Ostbevern | 680.80 mi (1,095.65 km) |
| Donegal to Osterburg | 820.04 mi (1,319.72 km) |
| Donegal to Ostercappeln | 688.54 mi (1,108.09 km) |
| Donegal to Osterhofen | 989.28 mi (1,592.08 km) |
| Donegal to Osterholz-Scharmbeck | 693.21 mi (1,115.61 km) |
| Donegal to Osternienburg | 852.31 mi (1,371.66 km) |
| Donegal to Osterode | 784.02 mi (1,261.77 km) |
| Donegal to Osterwieck | 796.44 mi (1,281.74 km) |
| Donegal to Ostfildern | 845.39 mi (1,360.52 km) |
| Donegal to Osthofen | 773.28 mi (1,244.47 km) |
| Donegal to Ostrhauderfehn | 647.78 mi (1,042.50 km) |
| Donegal to Ostringen | 806.14 mi (1,297.36 km) |
