| Truro to Olympia Heights (Florida) | 4,236.32 mi (6,817.70 km) |
| Truro to Omaha (Nebraska) | 4,151.39 mi (6,681.02 km) |
| Truro to On Top of the World Designated Place (Florida) | 4,157.24 mi (6,690.44 km) |
| Truro to Onalaska (Wisconsin) | 3,846.39 mi (6,190.17 km) |
| Truro to Oneida (New York) | 3,257.09 mi (5,241.78 km) |
| Truro to Oneonta (New York) | 3,256.80 mi (5,241.31 km) |
| Truro to Ontario (California) | 5,310.94 mi (8,547.13 km) |
| Truro to Ontario (Oregon) | 4,748.75 mi (7,642.38 km) |
| Truro to Opa-locka (Florida) | 4,224.04 mi (6,797.94 km) |
| Truro to Opelika (Alabama) | 4,120.75 mi (6,631.71 km) |
| Truro to Opelousas (Louisiana) | 4,506.45 mi (7,252.43 km) |
| Truro to Orange (California) | 5,331.37 mi (8,580.00 km) |
| Truro to Orange (Texas) | 4,596.42 mi (7,397.22 km) |
| Truro to Orange City (Florida) | 4,122.07 mi (6,633.83 km) |
| Truro to Orangeburg (South Carolina) | 3,889.34 mi (6,259.28 km) |
