| Aiken to Olympia Heights (Florida) | 545.75 mi (878.30 km) |
| Aiken to Omaha (Nebraska) | 948.69 mi (1,526.77 km) |
| Aiken to On Top of the World Designated Place (Florida) | 307.48 mi (494.84 km) |
| Aiken to Onalaska (Wisconsin) | 878.14 mi (1,413.23 km) |
| Aiken to Oneida (New York) | 736.52 mi (1,185.31 km) |
| Aiken to Oneonta (New York) | 714.82 mi (1,150.40 km) |
| Aiken to Ontario (California) | 2,050.00 mi (3,299.15 km) |
| Aiken to Ontario (Oregon) | 2,013.85 mi (3,240.97 km) |
| Aiken to Opa-locka (Florida) | 534.55 mi (860.28 km) |
| Aiken to Opelika (Alabama) | 219.62 mi (353.44 km) |
| Aiken to Opelousas (Louisiana) | 640.72 mi (1,031.15 km) |
| Aiken to Orange (California) | 2,064.86 mi (3,323.07 km) |
| Aiken to Orange (Texas) | 744.08 mi (1,197.48 km) |
| Aiken to Orange City (Florida) | 318.57 mi (512.70 km) |
| Aiken to Orangeburg (South Carolina) | 49.61 mi (79.84 km) |
