| Boston to Olympia Heights (Florida) | 4,424.66 mi (7,120.80 km) |
| Boston to Omaha (Nebraska) | 4,241.09 mi (6,825.37 km) |
| Boston to On Top of the World Designated Place (Florida) | 4,329.90 mi (6,968.30 km) |
| Boston to Onalaska (Wisconsin) | 3,939.05 mi (6,339.28 km) |
| Boston to Oneida (New York) | 3,394.54 mi (5,462.98 km) |
| Boston to Oneonta (New York) | 3,398.68 mi (5,469.65 km) |
| Boston to Ontario (California) | 5,357.22 mi (8,621.62 km) |
| Boston to Ontario (Oregon) | 4,766.52 mi (7,670.97 km) |
| Boston to Opa-locka (Florida) | 4,412.10 mi (7,100.60 km) |
| Boston to Opelika (Alabama) | 4,272.88 mi (6,876.53 km) |
| Boston to Opelousas (Louisiana) | 4,645.91 mi (7,476.87 km) |
| Boston to Orange (California) | 5,377.60 mi (8,654.41 km) |
| Boston to Orange (Texas) | 4,732.08 mi (7,615.55 km) |
| Boston to Orange City (Florida) | 4,298.09 mi (6,917.11 km) |
| Boston to Orangeburg (South Carolina) | 4,051.43 mi (6,520.15 km) |
