| Piqua to Rosemont (California) | 1,971.49 mi (3,172.81 km) |
| Piqua to Rosemount (Minnesota) | 550.06 mi (885.24 km) |
| Piqua to Rosenberg (Texas) | 982.04 mi (1,580.44 km) |
| Piqua to Roseville (California) | 1,965.68 mi (3,163.45 km) |
| Piqua to Roseville (Michigan) | 176.39 mi (283.88 km) |
| Piqua to Roseville (Minnesota) | 563.77 mi (907.31 km) |
| Piqua to Rossmoor (California) | 1,906.57 mi (3,068.32 km) |
| Piqua to Rossville (Maryland) | 416.08 mi (669.62 km) |
| Piqua to Roswell (Georgia) | 422.30 mi (679.63 km) |
| Piqua to Roswell (New Mexico) | 1,213.01 mi (1,952.15 km) |
| Piqua to Round Lake (Illinois) | 251.36 mi (404.52 km) |
| Piqua to Round Lake Beach (Illinois) | 251.79 mi (405.21 km) |
| Piqua to Round Rock (Texas) | 1,004.99 mi (1,617.37 km) |
| Piqua to Rowland Heights (California) | 1,891.63 mi (3,044.29 km) |
| Piqua to Rowlett (Texas) | 845.15 mi (1,360.14 km) |
