| Green Bay to Orbetello | 4,636.90 mi (7,462.38 km) |
| Green Bay to Oria | 4,973.53 mi (8,004.13 km) |
| Green Bay to Oristano | 4,644.94 mi (7,475.31 km) |
| Green Bay to Orta Nova | 4,861.10 mi (7,823.18 km) |
| Green Bay to Orte | 4,681.50 mi (7,534.14 km) |
| Green Bay to Ortona | 4,763.79 mi (7,666.58 km) |
| Green Bay to Orvieto | 4,659.24 mi (7,498.32 km) |
| Green Bay to Orzinuovi | 4,457.96 mi (7,174.39 km) |
| Green Bay to Osimo | 4,677.24 mi (7,527.30 km) |
| Green Bay to Ospitaletto | 4,456.58 mi (7,172.17 km) |
| Green Bay to Ostuni | 4,960.50 mi (7,983.15 km) |
| Green Bay to Ottaviano | 4,836.06 mi (7,782.89 km) |
| Green Bay to Ovada | 4,441.27 mi (7,147.54 km) |
| Green Bay to Ozieri | 4,631.60 mi (7,453.84 km) |
| Green Bay to Paceco | 4,892.62 mi (7,873.92 km) |
