| Glencullen to Oerlinghausen | 629.46 mi (1,013.02 km) |
| Glencullen to Oestrich-Winkel | 647.99 mi (1,042.84 km) |
| Glencullen to Offenburg | 697.62 mi (1,122.71 km) |
| Glencullen to Oftersheim | 690.99 mi (1,112.04 km) |
| Glencullen to Ohrdruf | 737.42 mi (1,186.76 km) |
| Glencullen to Ohringen | 732.91 mi (1,179.50 km) |
| Glencullen to Olbernhau | 848.28 mi (1,365.18 km) |
| Glencullen to Olching | 839.08 mi (1,350.36 km) |
| Glencullen to Oldenburg | 596.47 mi (959.93 km) |
| Glencullen to Oldenburg in Holstein | 700.61 mi (1,127.53 km) |
| Glencullen to Olfen | 580.85 mi (934.79 km) |
| Glencullen to Olpe | 614.10 mi (988.30 km) |
| Glencullen to Olsberg | 633.40 mi (1,019.35 km) |
| Glencullen to Oranienburg | 807.24 mi (1,299.13 km) |
| Glencullen to Ortenberg | 680.54 mi (1,095.23 km) |
