| Riom to Orzesze | 778.33 mi (1,252.60 km) |
| Riom to Osowa | 896.45 mi (1,442.70 km) |
| Riom to Ostroda | 921.43 mi (1,482.90 km) |
| Riom to Ostroleka | 961.20 mi (1,546.90 km) |
| Riom to Ostrow Mazowiecka | 966.85 mi (1,555.99 km) |
| Riom to Ostrow Wielkopolski | 776.68 mi (1,249.95 km) |
| Riom to Ostrowiec Swietokrzyski | 905.04 mi (1,456.53 km) |
| Riom to Ostrzeszow | 774.63 mi (1,246.65 km) |
| Riom to Oswiecim | 796.39 mi (1,281.66 km) |
| Riom to Otwock | 924.87 mi (1,488.44 km) |
| Riom to Ozarow Mazowiecki | 908.91 mi (1,462.74 km) |
| Riom to Ozimek | 766.95 mi (1,234.28 km) |
| Riom to Ozorkow | 842.82 mi (1,356.39 km) |
| Riom to Pabianice | 838.33 mi (1,349.16 km) |
| Riom to Parczew | 979.21 mi (1,575.88 km) |
