| Rockville to Pelham (Alabama) | 666.94 mi (1,073.34 km) |
| Rockville to Pell City (Alabama) | 634.16 mi (1,020.58 km) |
| Rockville to Pella (Iowa) | 845.43 mi (1,360.59 km) |
| Rockville to Pembroke Pines (Florida) | 921.74 mi (1,483.40 km) |
| Rockville to Pendleton (Oregon) | 2,149.35 mi (3,459.05 km) |
| Rockville to Pensacola (Florida) | 824.18 mi (1,326.38 km) |
| Rockville to Peoria (Arizona) | 1,974.91 mi (3,178.32 km) |
| Rockville to Peoria (Illinois) | 669.68 mi (1,077.74 km) |
| Rockville to Perris (California) | 2,238.72 mi (3,602.87 km) |
| Rockville to Perry (Georgia) | 586.50 mi (943.89 km) |
| Rockville to Perry Hall (Maryland) | 42.58 mi (68.52 km) |
| Rockville to Perrysburg (Ohio) | 381.35 mi (613.72 km) |
| Rockville to Perth Amboy (New Jersey) | 182.39 mi (293.53 km) |
| Rockville to Peru (Indiana) | 486.42 mi (782.81 km) |
| Rockville to Petal (Mississippi) | 865.08 mi (1,392.21 km) |
