| Dun Dealgan to Octeville | 364.56 mi (586.70 km) |
| Dun Dealgan to Oignies | 466.29 mi (750.42 km) |
| Dun Dealgan to Oissel | 454.67 mi (731.72 km) |
| Dun Dealgan to Olivet | 556.97 mi (896.36 km) |
| Dun Dealgan to Ollioules | 934.07 mi (1,503.24 km) |
| Dun Dealgan to Olonne-sur-Mer | 555.07 mi (893.30 km) |
| Dun Dealgan to Oloron-Sainte-Marie | 792.14 mi (1,274.83 km) |
| Dun Dealgan to Onet Village | 779.05 mi (1,253.76 km) |
| Dun Dealgan to Onnaing | 491.34 mi (790.73 km) |
| Dun Dealgan to Orange | 848.01 mi (1,364.74 km) |
| Dun Dealgan to Orchies | 475.10 mi (764.60 km) |
| Dun Dealgan to Orleans | 555.09 mi (893.33 km) |
| Dun Dealgan to Orly | 524.93 mi (844.80 km) |
| Dun Dealgan to Ormesson-sur-Marne | 527.35 mi (848.69 km) |
| Dun Dealgan to Orsay | 520.96 mi (838.40 km) |
