| Horley to Olympia Heights (Florida) | 4,438.57 mi (7,143.19 km) |
| Horley to Omaha (Nebraska) | 4,301.54 mi (6,922.65 km) |
| Horley to On Top of the World Designated Place (Florida) | 4,352.38 mi (7,004.48 km) |
| Horley to Onalaska (Wisconsin) | 3,998.08 mi (6,434.29 km) |
| Horley to Oneida (New York) | 3,433.80 mi (5,526.17 km) |
| Horley to Oneonta (New York) | 3,435.88 mi (5,529.52 km) |
| Horley to Ontario (California) | 5,434.52 mi (8,746.02 km) |
| Horley to Ontario (Oregon) | 4,852.84 mi (7,809.89 km) |
| Horley to Opa-locka (Florida) | 4,426.17 mi (7,123.23 km) |
| Horley to Opelika (Alabama) | 4,305.80 mi (6,929.52 km) |
| Horley to Opelousas (Louisiana) | 4,685.13 mi (7,540.00 km) |
| Horley to Orange (California) | 5,454.93 mi (8,778.86 km) |
| Horley to Orange (Texas) | 4,773.13 mi (7,681.61 km) |
| Horley to Orange City (Florida) | 4,318.76 mi (6,950.37 km) |
| Horley to Orangeburg (South Carolina) | 4,079.24 mi (6,564.90 km) |
