| Rapid City to Oskaloosa (Iowa) | 570.16 mi (917.58 km) |
| Rapid City to Oswego (Illinois) | 770.27 mi (1,239.63 km) |
| Rapid City to Oswego (New York) | 1,328.17 mi (2,137.49 km) |
| Rapid City to Otsego (Minnesota) | 478.60 mi (770.23 km) |
| Rapid City to Ottawa (Illinois) | 753.37 mi (1,212.43 km) |
| Rapid City to Ottawa (Kansas) | 559.28 mi (900.07 km) |
| Rapid City to Ottumwa (Iowa) | 588.34 mi (946.84 km) |
| Rapid City to Overland (Missouri) | 761.50 mi (1,225.51 km) |
| Rapid City to Overland Park (Kansas) | 568.19 mi (914.41 km) |
| Rapid City to Overlea (Maryland) | 1,408.33 mi (2,266.49 km) |
| Rapid City to Oviedo (Florida) | 1,614.46 mi (2,598.22 km) |
| Rapid City to Owasso (Oklahoma) | 663.76 mi (1,068.21 km) |
| Rapid City to Owatonna (Minnesota) | 495.49 mi (797.42 km) |
| Rapid City to Owensboro (Kentucky) | 944.95 mi (1,520.75 km) |
| Rapid City to Owings Mills (Maryland) | 1,393.55 mi (2,242.71 km) |
