| Haddington to Olympia Heights (Florida) | 4,288.99 mi (6,902.46 km) |
| Haddington to Omaha (Nebraska) | 4,042.14 mi (6,505.20 km) |
| Haddington to On Top of the World Designated Place (Florida) | 4,181.41 mi (6,729.33 km) |
| Haddington to Onalaska (Wisconsin) | 3,742.14 mi (6,022.38 km) |
| Haddington to Oneida (New York) | 3,224.09 mi (5,188.68 km) |
| Haddington to Oneonta (New York) | 3,231.11 mi (5,199.97 km) |
| Haddington to Ontario (California) | 5,140.01 mi (8,272.04 km) |
| Haddington to Ontario (Oregon) | 4,542.12 mi (7,309.84 km) |
| Haddington to Opa-locka (Florida) | 4,276.23 mi (6,881.93 km) |
| Haddington to Opelika (Alabama) | 4,109.34 mi (6,613.34 km) |
| Haddington to Opelousas (Louisiana) | 4,472.99 mi (7,198.59 km) |
| Haddington to Orange (California) | 5,160.34 mi (8,304.77 km) |
| Haddington to Orange (Texas) | 4,556.59 mi (7,333.13 km) |
| Haddington to Orange City (Florida) | 4,152.40 mi (6,682.64 km) |
| Haddington to Orangeburg (South Carolina) | 3,895.71 mi (6,269.54 km) |
