| Mullingar to Opwijk | 517.69 mi (833.15 km) |
| Mullingar to Ostend | 460.34 mi (740.85 km) |
| Mullingar to Oud-Heverlee | 540.68 mi (870.15 km) |
| Mullingar to Oud-Turnhout | 540.30 mi (869.54 km) |
| Mullingar to Oudenaarde | 498.13 mi (801.66 km) |
| Mullingar to Oudenburg | 464.73 mi (747.91 km) |
| Mullingar to Oupeye | 583.07 mi (938.36 km) |
| Mullingar to Overijse | 536.86 mi (864.00 km) |
| Mullingar to Overpelt | 560.27 mi (901.67 km) |
| Mullingar to Paal | 555.11 mi (893.36 km) |
| Mullingar to Peer | 563.90 mi (907.51 km) |
| Mullingar to Pepinster | 594.08 mi (956.08 km) |
| Mullingar to Peruwelz | 508.00 mi (817.54 km) |
| Mullingar to Perwez | 552.73 mi (889.54 km) |
| Mullingar to Philippeville | 555.88 mi (894.61 km) |
