| Stone Ridge to Orbetello | 4,430.79 mi (7,130.68 km) |
| Stone Ridge to Oria | 4,783.45 mi (7,698.22 km) |
| Stone Ridge to Oristano | 4,400.64 mi (7,082.15 km) |
| Stone Ridge to Orta Nova | 4,668.08 mi (7,512.56 km) |
| Stone Ridge to Orte | 4,481.63 mi (7,212.48 km) |
| Stone Ridge to Ortona | 4,573.39 mi (7,360.16 km) |
| Stone Ridge to Orvieto | 4,460.47 mi (7,178.44 km) |
| Stone Ridge to Orzinuovi | 4,275.40 mi (6,880.59 km) |
| Stone Ridge to Osimo | 4,493.03 mi (7,230.83 km) |
| Stone Ridge to Ospitaletto | 4,276.30 mi (6,882.04 km) |
| Stone Ridge to Ostuni | 4,772.26 mi (7,680.21 km) |
| Stone Ridge to Ottaviano | 4,631.87 mi (7,454.27 km) |
| Stone Ridge to Ovada | 4,244.65 mi (6,831.11 km) |
| Stone Ridge to Ozieri | 4,396.01 mi (7,074.70 km) |
| Stone Ridge to Paceco | 4,651.37 mi (7,485.65 km) |
