| Tallaght to Oerlinghausen | 635.46 mi (1,022.67 km) |
| Tallaght to Oestrich-Winkel | 654.78 mi (1,053.76 km) |
| Tallaght to Offenburg | 704.74 mi (1,134.18 km) |
| Tallaght to Oftersheim | 697.89 mi (1,123.14 km) |
| Tallaght to Ohrdruf | 743.71 mi (1,196.88 km) |
| Tallaght to Ohringen | 739.77 mi (1,190.54 km) |
| Tallaght to Olbernhau | 854.44 mi (1,375.09 km) |
| Tallaght to Olching | 846.00 mi (1,361.50 km) |
| Tallaght to Oldenburg | 601.89 mi (968.64 km) |
| Tallaght to Oldenburg in Holstein | 705.30 mi (1,135.08 km) |
| Tallaght to Olfen | 587.06 mi (944.78 km) |
| Tallaght to Olpe | 620.56 mi (998.70 km) |
| Tallaght to Olsberg | 639.67 mi (1,029.46 km) |
| Tallaght to Oranienburg | 812.62 mi (1,307.79 km) |
| Tallaght to Ortenberg | 687.13 mi (1,105.83 km) |
