| Colleferro to Olympia Heights (Florida) | 5,219.85 mi (8,400.53 km) |
| Colleferro to Omaha (Nebraska) | 5,194.61 mi (8,359.91 km) |
| Colleferro to On Top of the World Designated Place (Florida) | 5,162.68 mi (8,308.52 km) |
| Colleferro to Onalaska (Wisconsin) | 4,889.89 mi (7,869.52 km) |
| Colleferro to Oneida (New York) | 4,293.95 mi (6,910.45 km) |
| Colleferro to Oneonta (New York) | 4,291.51 mi (6,906.52 km) |
| Colleferro to Ontario (California) | 6,337.20 mi (10,198.73 km) |
| Colleferro to Ontario (Oregon) | 5,751.07 mi (9,255.45 km) |
| Colleferro to Opa-locka (Florida) | 5,208.09 mi (8,381.61 km) |
| Colleferro to Opelika (Alabama) | 5,146.25 mi (8,282.08 km) |
| Colleferro to Opelousas (Louisiana) | 5,539.47 mi (8,914.91 km) |
| Colleferro to Orange (California) | 6,357.60 mi (10,231.57 km) |
| Colleferro to Orange (Texas) | 5,631.36 mi (9,062.79 km) |
| Colleferro to Orange City (Florida) | 5,123.62 mi (8,245.67 km) |
| Colleferro to Orangeburg (South Carolina) | 4,907.24 mi (7,897.44 km) |
