| Heum to Orbetello | 1,151.80 mi (1,853.65 km) |
| Heum to Oria | 1,325.99 mi (2,133.98 km) |
| Heum to Oristano | 1,327.53 mi (2,136.46 km) |
| Heum to Orta Nova | 1,251.15 mi (2,013.52 km) |
| Heum to Orte | 1,153.53 mi (1,856.43 km) |
| Heum to Ortona | 1,171.57 mi (1,885.45 km) |
| Heum to Orvieto | 1,134.80 mi (1,826.28 km) |
| Heum to Orzinuovi | 946.29 mi (1,522.91 km) |
| Heum to Osimo | 1,088.19 mi (1,751.27 km) |
| Heum to Ospitaletto | 935.54 mi (1,505.60 km) |
| Heum to Ostuni | 1,309.68 mi (2,107.72 km) |
| Heum to Ottaviano | 1,274.87 mi (2,051.70 km) |
| Heum to Ovada | 1,000.71 mi (1,610.48 km) |
| Heum to Ozieri | 1,279.86 mi (2,059.73 km) |
| Heum to Paceco | 1,462.76 mi (2,354.08 km) |
