| Trevignano to Olympia Heights (Florida) | 5,077.92 mi (8,172.12 km) |
| Trevignano to Omaha (Nebraska) | 4,975.36 mi (8,007.06 km) |
| Trevignano to On Top of the World Designated Place (Florida) | 5,004.94 mi (8,054.68 km) |
| Trevignano to Onalaska (Wisconsin) | 4,672.28 mi (7,519.31 km) |
| Trevignano to Oneida (New York) | 4,104.13 mi (6,604.96 km) |
| Trevignano to Oneonta (New York) | 4,104.85 mi (6,606.12 km) |
| Trevignano to Ontario (California) | 6,094.15 mi (9,807.58 km) |
| Trevignano to Ontario (Oregon) | 5,496.44 mi (8,845.67 km) |
| Trevignano to Opa-locka (Florida) | 5,065.80 mi (8,152.62 km) |
| Trevignano to Opelika (Alabama) | 4,970.40 mi (7,999.09 km) |
| Trevignano to Opelousas (Louisiana) | 5,354.59 mi (8,617.37 km) |
| Trevignano to Orange (California) | 6,114.50 mi (9,840.34 km) |
| Trevignano to Orange (Texas) | 5,443.73 mi (8,760.84 km) |
| Trevignano to Orange City (Florida) | 4,968.87 mi (7,996.62 km) |
| Trevignano to Orangeburg (South Carolina) | 4,738.86 mi (7,626.46 km) |
