| Mullingar to Octeville | 363.43 mi (584.88 km) |
| Mullingar to Oignies | 486.91 mi (783.61 km) |
| Mullingar to Oissel | 463.45 mi (745.85 km) |
| Mullingar to Olivet | 561.62 mi (903.84 km) |
| Mullingar to Ollioules | 935.81 mi (1,506.04 km) |
| Mullingar to Olonne-sur-Mer | 541.84 mi (872.01 km) |
| Mullingar to Oloron-Sainte-Marie | 776.81 mi (1,250.15 km) |
| Mullingar to Onet Village | 775.22 mi (1,247.59 km) |
| Mullingar to Onnaing | 512.85 mi (825.36 km) |
| Mullingar to Orange | 849.50 mi (1,367.14 km) |
| Mullingar to Orchies | 496.33 mi (798.76 km) |
| Mullingar to Orleans | 559.92 mi (901.10 km) |
| Mullingar to Orly | 534.94 mi (860.90 km) |
| Mullingar to Ormesson-sur-Marne | 537.99 mi (865.80 km) |
| Mullingar to Orsay | 530.12 mi (853.15 km) |
