| Piqua to Red Bank (New Jersey) | 536.55 mi (863.50 km) |
| Piqua to Red Bank (Tennessee) | 352.87 mi (567.89 km) |
| Piqua to Red Bluff (California) | 1,990.70 mi (3,203.72 km) |
| Piqua to Red Hill (South Carolina) | 526.40 mi (847.15 km) |
| Piqua to Red Oak (Texas) | 873.29 mi (1,405.43 km) |
| Piqua to Red Wing (Minnesota) | 524.77 mi (844.54 km) |
| Piqua to Redan (Georgia) | 442.99 mi (712.93 km) |
| Piqua to Redding (California) | 1,991.30 mi (3,204.69 km) |
| Piqua to Redland (Maryland) | 384.00 mi (617.99 km) |
| Piqua to Redlands (California) | 1,851.50 mi (2,979.70 km) |
| Piqua to Redmond (Oregon) | 1,895.33 mi (3,050.24 km) |
| Piqua to Redmond (Washington) | 1,934.27 mi (3,112.91 km) |
| Piqua to Redondo Beach (California) | 1,920.32 mi (3,090.46 km) |
| Piqua to Redwood City (California) | 2,037.03 mi (3,278.27 km) |
| Piqua to Reedley (California) | 1,909.97 mi (3,073.80 km) |
