| Piqua to Romeoville (Illinois) | 225.86 mi (363.49 km) |
| Piqua to Romulus (Michigan) | 150.34 mi (241.94 km) |
| Piqua to Ronkonkoma (New York) | 585.75 mi (942.67 km) |
| Piqua to Roosevelt (New York) | 561.64 mi (903.87 km) |
| Piqua to Rosamond (California) | 1,885.48 mi (3,034.39 km) |
| Piqua to Rosaryville (Maryland) | 406.94 mi (654.90 km) |
| Piqua to Roscoe (Illinois) | 293.00 mi (471.53 km) |
| Piqua to Rose Hill (Virginia) | 391.96 mi (630.80 km) |
| Piqua to Roseburg (Oregon) | 2,010.58 mi (3,235.71 km) |
| Piqua to Rosedale (California) | 1,924.92 mi (3,097.86 km) |
| Piqua to Rosedale (Maryland) | 414.79 mi (667.54 km) |
| Piqua to Roselle (Illinois) | 236.71 mi (380.95 km) |
| Piqua to Roselle (New Jersey) | 526.19 mi (846.82 km) |
| Piqua to Roselle Park (New Jersey) | 525.85 mi (846.27 km) |
| Piqua to Rosemead (California) | 1,899.11 mi (3,056.32 km) |
