| Thatto Heath to Olympia Heights (Florida) | 4,308.53 mi (6,933.91 km) |
| Thatto Heath to Omaha (Nebraska) | 4,127.77 mi (6,643.01 km) |
| Thatto Heath to On Top of the World Designated Place (Florida) | 4,212.93 mi (6,780.06 km) |
| Thatto Heath to Onalaska (Wisconsin) | 3,825.32 mi (6,156.25 km) |
| Thatto Heath to Oneida (New York) | 3,277.55 mi (5,274.71 km) |
| Thatto Heath to Oneonta (New York) | 3,281.58 mi (5,281.19 km) |
| Thatto Heath to Ontario (California) | 5,250.48 mi (8,449.84 km) |
| Thatto Heath to Ontario (Oregon) | 4,664.93 mi (7,507.47 km) |
| Thatto Heath to Opa-locka (Florida) | 4,295.96 mi (6,913.68 km) |
| Thatto Heath to Opelika (Alabama) | 4,155.65 mi (6,687.87 km) |
| Thatto Heath to Opelousas (Louisiana) | 4,528.97 mi (7,288.68 km) |
| Thatto Heath to Orange (California) | 5,270.88 mi (8,482.65 km) |
| Thatto Heath to Orange (Texas) | 4,615.30 mi (7,427.60 km) |
| Thatto Heath to Orange City (Florida) | 4,181.26 mi (6,729.09 km) |
| Thatto Heath to Orangeburg (South Carolina) | 3,934.22 mi (6,331.52 km) |
