| Monterotondo to Opwijk | 734.05 mi (1,181.34 km) |
| Monterotondo to Ostend | 781.88 mi (1,258.31 km) |
| Monterotondo to Oud-Heverlee | 714.30 mi (1,149.56 km) |
| Monterotondo to Oud-Turnhout | 734.51 mi (1,182.08 km) |
| Monterotondo to Oudenaarde | 743.08 mi (1,195.87 km) |
| Monterotondo to Oudenburg | 777.39 mi (1,251.09 km) |
| Monterotondo to Oupeye | 683.66 mi (1,100.25 km) |
| Monterotondo to Overijse | 714.84 mi (1,150.42 km) |
| Monterotondo to Overpelt | 718.79 mi (1,156.78 km) |
| Monterotondo to Paal | 713.92 mi (1,148.95 km) |
| Monterotondo to Peer | 713.00 mi (1,147.46 km) |
| Monterotondo to Pepinster | 671.35 mi (1,080.43 km) |
| Monterotondo to Peruwelz | 725.69 mi (1,167.88 km) |
| Monterotondo to Perwez | 698.74 mi (1,124.51 km) |
| Monterotondo to Philippeville | 682.00 mi (1,097.57 km) |
