| Cologno al Serio to Olympia Heights (Florida) | 4,972.33 mi (8,002.18 km) |
| Cologno al Serio to Omaha (Nebraska) | 4,894.43 mi (7,876.82 km) |
| Cologno al Serio to On Top of the World Designated Place (Florida) | 4,902.81 mi (7,890.32 km) |
| Cologno al Serio to Onalaska (Wisconsin) | 4,590.48 mi (7,387.67 km) |
| Cologno al Serio to Oneida (New York) | 4,010.93 mi (6,454.97 km) |
| Cologno al Serio to Oneonta (New York) | 4,010.58 mi (6,454.41 km) |
| Cologno al Serio to Ontario (California) | 6,027.02 mi (9,699.55 km) |
| Cologno al Serio to Ontario (Oregon) | 5,438.10 mi (8,751.77 km) |
| Cologno al Serio to Opa-locka (Florida) | 4,960.28 mi (7,982.80 km) |
| Cologno al Serio to Opelika (Alabama) | 4,873.08 mi (7,842.47 km) |
| Cologno al Serio to Opelousas (Louisiana) | 5,260.18 mi (8,465.44 km) |
| Cologno al Serio to Orange (California) | 6,047.41 mi (9,732.36 km) |
| Cologno al Serio to Orange (Texas) | 5,350.26 mi (8,610.40 km) |
| Cologno al Serio to Orange City (Florida) | 4,866.02 mi (7,831.10 km) |
| Cologno al Serio to Orangeburg (South Carolina) | 4,639.36 mi (7,466.33 km) |
