| Piqua to Rockville (Maryland) | 384.32 mi (618.51 km) |
| Piqua to Rockville Centre (New York) | 558.77 mi (899.26 km) |
| Piqua to Rockwall (Texas) | 840.13 mi (1,352.05 km) |
| Piqua to Rocky Mount (North Carolina) | 453.92 mi (730.51 km) |
| Piqua to Rocky Point (New York) | 595.76 mi (958.79 km) |
| Piqua to Rocky River (Ohio) | 154.76 mi (249.07 km) |
| Piqua to Roessleville (New York) | 568.70 mi (915.24 km) |
| Piqua to Rogers (Arkansas) | 598.99 mi (963.98 km) |
| Piqua to Rogers (Minnesota) | 587.54 mi (945.55 km) |
| Piqua to Rohnert Park (California) | 2,045.12 mi (3,291.31 km) |
| Piqua to Rolla (Missouri) | 430.96 mi (693.57 km) |
| Piqua to Rolling Meadows (Illinois) | 237.48 mi (382.19 km) |
| Piqua to Roma (Texas) | 1,272.10 mi (2,047.25 km) |
| Piqua to Rome (Georgia) | 409.86 mi (659.60 km) |
| Piqua to Rome (New York) | 498.79 mi (802.72 km) |
