| Kardzhali to Olympia Heights (Florida) | 5,797.06 mi (9,329.47 km) |
| Kardzhali to Omaha (Nebraska) | 5,640.37 mi (9,077.30 km) |
| Kardzhali to On Top of the World Designated Place (Florida) | 5,721.13 mi (9,207.27 km) |
| Kardzhali to Onalaska (Wisconsin) | 5,341.04 mi (8,595.58 km) |
| Kardzhali to Oneida (New York) | 4,805.06 mi (7,732.99 km) |
| Kardzhali to Oneonta (New York) | 4,808.09 mi (7,737.87 km) |
| Kardzhali to Ontario (California) | 6,703.86 mi (10,788.82 km) |
| Kardzhali to Ontario (Oregon) | 6,073.77 mi (9,774.78 km) |
| Kardzhali to Opa-locka (Florida) | 5,784.92 mi (9,309.92 km) |
| Kardzhali to Opelika (Alabama) | 5,678.95 mi (9,139.38 km) |
| Kardzhali to Opelousas (Louisiana) | 6,056.61 mi (9,747.17 km) |
| Kardzhali to Orange (California) | 6,723.96 mi (10,821.16 km) |
| Kardzhali to Orange (Texas) | 6,143.47 mi (9,886.95 km) |
| Kardzhali to Orange City (Florida) | 5,685.89 mi (9,150.55 km) |
| Kardzhali to Orangeburg (South Carolina) | 5,451.43 mi (8,773.22 km) |
