| Dyer to Olympia Heights (Florida) | 1,164.23 mi (1,873.65 km) |
| Dyer to Omaha (Nebraska) | 443.06 mi (713.04 km) |
| Dyer to On Top of the World Designated Place (Florida) | 904.94 mi (1,456.37 km) |
| Dyer to Onalaska (Wisconsin) | 250.07 mi (402.45 km) |
| Dyer to Oneida (New York) | 614.74 mi (989.33 km) |
| Dyer to Oneonta (New York) | 641.94 mi (1,033.10 km) |
| Dyer to Ontario (California) | 1,712.73 mi (2,756.38 km) |
| Dyer to Ontario (Oregon) | 1,496.88 mi (2,408.99 km) |
| Dyer to Opa-locka (Florida) | 1,154.45 mi (1,857.91 km) |
| Dyer to Opelika (Alabama) | 621.69 mi (1,000.52 km) |
| Dyer to Opelousas (Louisiana) | 799.71 mi (1,287.01 km) |
| Dyer to Orange (California) | 1,731.06 mi (2,785.87 km) |
| Dyer to Orange (Texas) | 859.85 mi (1,383.79 km) |
| Dyer to Orange City (Florida) | 935.67 mi (1,505.82 km) |
| Dyer to Orangeburg (South Carolina) | 661.68 mi (1,064.87 km) |
