| Santa Maria a Monte to Orbetello | 91.10 mi (146.61 km) |
| Santa Maria a Monte to Oria | 419.10 mi (674.48 km) |
| Santa Maria a Monte to Oristano | 283.40 mi (456.09 km) |
| Santa Maria a Monte to Orta Nova | 303.84 mi (488.98 km) |
| Santa Maria a Monte to Orte | 121.33 mi (195.25 km) |
| Santa Maria a Monte to Ortona | 209.60 mi (337.32 km) |
| Santa Maria a Monte to Orvieto | 98.82 mi (159.03 km) |
| Santa Maria a Monte to Orzinuovi | 123.13 mi (198.15 km) |
| Santa Maria a Monte to Osimo | 140.91 mi (226.77 km) |
| Santa Maria a Monte to Ospitaletto | 131.65 mi (211.87 km) |
| Santa Maria a Monte to Ostuni | 408.07 mi (656.72 km) |
| Santa Maria a Monte to Ottaviano | 276.35 mi (444.74 km) |
| Santa Maria a Monte to Ovada | 120.00 mi (193.12 km) |
| Santa Maria a Monte to Ozieri | 231.79 mi (373.03 km) |
| Santa Maria a Monte to Paceco | 406.83 mi (654.72 km) |
