| Mullingar to Oria | 1,468.07 mi (2,362.62 km) |
| Mullingar to Oristano | 1,200.36 mi (1,931.79 km) |
| Mullingar to Orta Nova | 1,357.16 mi (2,184.14 km) |
| Mullingar to Orte | 1,182.92 mi (1,903.72 km) |
| Mullingar to Ortona | 1,259.62 mi (2,027.16 km) |
| Mullingar to Orvieto | 1,160.32 mi (1,867.35 km) |
| Mullingar to Orzinuovi | 953.28 mi (1,534.16 km) |
| Mullingar to Osimo | 1,171.68 mi (1,885.64 km) |
| Mullingar to Ospitaletto | 951.16 mi (1,530.74 km) |
| Mullingar to Ostuni | 1,454.65 mi (2,341.04 km) |
| Mullingar to Ottaviano | 1,337.87 mi (2,153.09 km) |
| Mullingar to Ovada | 944.89 mi (1,520.65 km) |
| Mullingar to Ozieri | 1,173.62 mi (1,888.76 km) |
| Mullingar to Paceco | 1,429.59 mi (2,300.70 km) |
| Mullingar to Pachino | 1,581.96 mi (2,545.92 km) |
