| Greentree to Orbetello | 4,278.60 mi (6,885.74 km) |
| Greentree to Oria | 4,631.66 mi (7,453.94 km) |
| Greentree to Oristano | 4,247.35 mi (6,835.45 km) |
| Greentree to Orta Nova | 4,516.25 mi (7,268.20 km) |
| Greentree to Orte | 4,329.64 mi (6,967.88 km) |
| Greentree to Ortona | 4,421.72 mi (7,116.07 km) |
| Greentree to Orvieto | 4,308.54 mi (6,933.92 km) |
| Greentree to Orzinuovi | 4,124.29 mi (6,637.40 km) |
| Greentree to Osimo | 4,341.68 mi (6,987.26 km) |
| Greentree to Ospitaletto | 4,125.30 mi (6,639.03 km) |
| Greentree to Ostuni | 4,620.56 mi (7,436.07 km) |
| Greentree to Ottaviano | 4,479.63 mi (7,209.27 km) |
| Greentree to Ovada | 4,092.95 mi (6,586.96 km) |
| Greentree to Ozieri | 4,242.92 mi (6,828.32 km) |
| Greentree to Paceco | 4,498.06 mi (7,238.93 km) |
