| Piqua to Ridgeland (Mississippi) | 626.65 mi (1,008.49 km) |
| Piqua to Ridgewood (New Jersey) | 534.55 mi (860.28 km) |
| Piqua to Rifle (Colorado) | 1,245.27 mi (2,004.07 km) |
| Piqua to Rincon (Georgia) | 568.01 mi (914.12 km) |
| Piqua to Ringwood (New Jersey) | 526.62 mi (847.52 km) |
| Piqua to Río Grande (Puerto Rico) | 1,860.65 mi (2,994.42 km) |
| Piqua to Rio Grande City (Texas) | 1,267.04 mi (2,039.10 km) |
| Piqua to Rio Linda (California) | 1,973.50 mi (3,176.04 km) |
| Piqua to Rio Rancho (New Mexico) | 1,268.53 mi (2,041.50 km) |
| Piqua to Rio Rico (Arizona) | 1,605.42 mi (2,583.68 km) |
| Piqua to Ripon (California) | 1,974.92 mi (3,178.32 km) |
| Piqua to River Edge (New Jersey) | 538.24 mi (866.21 km) |
| Piqua to River Falls (Wisconsin) | 536.31 mi (863.11 km) |
| Piqua to River Forest (Illinois) | 221.92 mi (357.14 km) |
| Piqua to River Grove (Illinois) | 223.79 mi (360.16 km) |
