| Heath to Olympia Heights (Florida) | 995.46 mi (1,602.03 km) |
| Heath to Omaha (Nebraska) | 717.97 mi (1,155.46 km) |
| Heath to On Top of the World Designated Place (Florida) | 754.43 mi (1,214.14 km) |
| Heath to Onalaska (Wisconsin) | 523.19 mi (841.99 km) |
| Heath to Oneida (New York) | 408.90 mi (658.06 km) |
| Heath to Oneonta (New York) | 418.16 mi (672.97 km) |
| Heath to Ontario (California) | 1,969.80 mi (3,170.09 km) |
| Heath to Ontario (Oregon) | 1,780.64 mi (2,865.67 km) |
| Heath to Opa-locka (Florida) | 984.00 mi (1,583.60 km) |
| Heath to Opelika (Alabama) | 534.23 mi (859.75 km) |
| Heath to Opelousas (Louisiana) | 851.18 mi (1,369.85 km) |
| Heath to Orange (California) | 1,987.47 mi (3,198.53 km) |
| Heath to Orange (Texas) | 935.29 mi (1,505.20 km) |
| Heath to Orange City (Florida) | 768.99 mi (1,237.56 km) |
| Heath to Orangeburg (South Carolina) | 459.58 mi (739.62 km) |
