| Green Bay to Oerlinghausen | 4,139.68 mi (6,662.17 km) |
| Green Bay to Oestrich-Winkel | 4,194.60 mi (6,750.56 km) |
| Green Bay to Offenburg | 4,254.32 mi (6,846.67 km) |
| Green Bay to Oftersheim | 4,241.28 mi (6,825.67 km) |
| Green Bay to Ohrdruf | 4,257.95 mi (6,852.51 km) |
| Green Bay to Ohringen | 4,281.45 mi (6,890.33 km) |
| Green Bay to Olbernhau | 4,354.88 mi (7,008.51 km) |
| Green Bay to Olching | 4,389.23 mi (7,063.78 km) |
| Green Bay to Oldenburg | 4,077.79 mi (6,562.57 km) |
| Green Bay to Oldenburg in Holstein | 4,121.94 mi (6,633.63 km) |
| Green Bay to Olfen | 4,104.51 mi (6,605.57 km) |
| Green Bay to Olpe | 4,148.02 mi (6,675.59 km) |
| Green Bay to Olsberg | 4,157.79 mi (6,691.31 km) |
| Green Bay to Oranienburg | 4,263.08 mi (6,860.76 km) |
| Green Bay to Ortenberg | 4,218.09 mi (6,788.36 km) |
