| Riom to Navodari | 1,242.94 mi (2,000.33 km) |
| Riom to Negresti-Oas | 966.03 mi (1,554.68 km) |
| Riom to Nehoiu | 1,117.38 mi (1,798.24 km) |
| Riom to Ocna Mures | 990.99 mi (1,594.85 km) |
| Riom to Odobesti | 1,148.92 mi (1,849.00 km) |
| Riom to Odorheiu Secuiesc | 1,059.92 mi (1,705.77 km) |
| Riom to Oltenita | 1,152.03 mi (1,854.02 km) |
| Riom to Onesti | 1,129.94 mi (1,818.46 km) |
| Riom to Oradea | 896.35 mi (1,442.53 km) |
| Riom to Orastie | 963.80 mi (1,551.08 km) |
| Riom to Oravita | 899.86 mi (1,448.19 km) |
| Riom to Orsova | 938.19 mi (1,509.87 km) |
| Riom to Otelu Rosu | 926.47 mi (1,491.00 km) |
| Riom to Otopeni | 1,117.24 mi (1,798.02 km) |
| Riom to Ovidiu | 1,241.25 mi (1,997.59 km) |
