| Riihimaki to Opwijk | 1,037.52 mi (1,669.73 km) |
| Riihimaki to Ostend | 1,061.35 mi (1,708.08 km) |
| Riihimaki to Oud-Heverlee | 1,030.60 mi (1,658.59 km) |
| Riihimaki to Oud-Turnhout | 996.42 mi (1,603.58 km) |
| Riihimaki to Oudenaarde | 1,060.45 mi (1,706.63 km) |
| Riihimaki to Oudenburg | 1,061.10 mi (1,707.67 km) |
| Riihimaki to Oupeye | 1,009.74 mi (1,625.02 km) |
| Riihimaki to Overijse | 1,037.02 mi (1,668.92 km) |
| Riihimaki to Overpelt | 989.25 mi (1,592.04 km) |
| Riihimaki to Paal | 1,005.44 mi (1,618.10 km) |
| Riihimaki to Peer | 992.59 mi (1,597.42 km) |
| Riihimaki to Pepinster | 1,012.53 mi (1,629.50 km) |
| Riihimaki to Peruwelz | 1,078.20 mi (1,735.19 km) |
| Riihimaki to Perwez | 1,037.40 mi (1,669.54 km) |
| Riihimaki to Philippeville | 1,067.40 mi (1,717.81 km) |
