| Cities | Distance |
|---|---|
| Riom to Oria | 819.17 mi (1,318.33 km) |
| Riom to Oristano | 497.78 mi (801.11 km) |
| Riom to Orta Nova | 703.62 mi (1,132.36 km) |
| Riom to Orte | 516.70 mi (831.55 km) |
| Riom to Ortona | 610.33 mi (982.24 km) |
| Riom to Orvieto | 495.65 mi (797.67 km) |
| Riom to Orzinuovi | 331.11 mi (532.88 km) |
| Riom to Osimo | 535.49 mi (861.79 km) |
| Riom to Ospitaletto | 336.46 mi (541.48 km) |
| Riom to Ostuni | 808.53 mi (1,301.21 km) |
| Riom to Ottaviano | 667.82 mi (1,074.74 km) |
| Riom to Ovada | 282.65 mi (454.88 km) |
| Riom to Ozieri | 471.37 mi (758.60 km) |
| Riom to Paceco | 729.71 mi (1,174.35 km) |
| Riom to Pachino | 886.45 mi (1,426.60 km) |