| Green Bay to Olympia Heights (Florida) | 1,366.86 mi (2,199.75 km) |
| Green Bay to Omaha (Nebraska) | 465.64 mi (749.38 km) |
| Green Bay to On Top of the World Designated Place (Florida) | 1,109.67 mi (1,785.85 km) |
| Green Bay to Onalaska (Wisconsin) | 165.16 mi (265.79 km) |
| Green Bay to Oneida (New York) | 622.14 mi (1,001.24 km) |
| Green Bay to Oneonta (New York) | 662.52 mi (1,066.23 km) |
| Green Bay to Ontario (California) | 1,728.97 mi (2,782.51 km) |
| Green Bay to Ontario (Oregon) | 1,426.94 mi (2,296.43 km) |
| Green Bay to Opa-locka (Florida) | 1,356.69 mi (2,183.38 km) |
| Green Bay to Opelika (Alabama) | 830.94 mi (1,337.28 km) |
| Green Bay to Opelousas (Louisiana) | 991.91 mi (1,596.32 km) |
| Green Bay to Orange (California) | 1,748.28 mi (2,813.58 km) |
| Green Bay to Orange (Texas) | 1,043.03 mi (1,678.60 km) |
| Green Bay to Orange City (Florida) | 1,137.63 mi (1,830.83 km) |
| Green Bay to Orangeburg (South Carolina) | 851.34 mi (1,370.10 km) |
