| Mastic Beach to Orbetello | 4,152.08 mi (6,682.13 km) |
| Mastic Beach to Oria | 4,505.34 mi (7,250.64 km) |
| Mastic Beach to Oristano | 4,120.44 mi (6,631.20 km) |
| Mastic Beach to Orta Nova | 4,389.90 mi (7,064.87 km) |
| Mastic Beach to Orte | 4,203.22 mi (6,764.43 km) |
| Mastic Beach to Ortona | 4,295.46 mi (6,912.87 km) |
| Mastic Beach to Orvieto | 4,182.15 mi (6,730.51 km) |
| Mastic Beach to Orzinuovi | 3,998.33 mi (6,434.70 km) |
| Mastic Beach to Osimo | 4,215.59 mi (6,784.34 km) |
| Mastic Beach to Ospitaletto | 3,999.40 mi (6,436.42 km) |
| Mastic Beach to Ostuni | 4,494.27 mi (7,232.83 km) |
| Mastic Beach to Ottaviano | 4,353.09 mi (7,005.62 km) |
| Mastic Beach to Ovada | 3,966.67 mi (6,383.74 km) |
| Mastic Beach to Ozieri | 4,116.06 mi (6,624.16 km) |
| Mastic Beach to Paceco | 4,371.15 mi (7,034.68 km) |
