| Stamford to Olympia Heights (Florida) | 4,408.97 mi (7,095.54 km) |
| Stamford to Omaha (Nebraska) | 4,236.12 mi (6,817.38 km) |
| Stamford to On Top of the World Designated Place (Florida) | 4,315.96 mi (6,945.86 km) |
| Stamford to Onalaska (Wisconsin) | 3,933.67 mi (6,330.64 km) |
| Stamford to Oneida (New York) | 3,384.20 mi (5,446.34 km) |
| Stamford to Oneonta (New York) | 3,387.87 mi (5,452.24 km) |
| Stamford to Ontario (California) | 5,357.10 mi (8,621.42 km) |
| Stamford to Ontario (Oregon) | 4,769.18 mi (7,675.25 km) |
| Stamford to Opa-locka (Florida) | 4,396.44 mi (7,075.39 km) |
| Stamford to Opelika (Alabama) | 4,261.20 mi (6,857.73 km) |
| Stamford to Opelousas (Louisiana) | 4,635.70 mi (7,460.44 km) |
| Stamford to Orange (California) | 5,377.49 mi (8,654.23 km) |
| Stamford to Orange (Texas) | 4,722.31 mi (7,599.83 km) |
| Stamford to Orange City (Florida) | 4,283.77 mi (6,894.05 km) |
| Stamford to Orangeburg (South Carolina) | 4,038.60 mi (6,499.49 km) |
