| Rockville to Prichard (Alabama) | 845.05 mi (1,359.97 km) |
| Rockville to Princeton (Florida) | 954.55 mi (1,536.19 km) |
| Rockville to Princeton (New Jersey) | 158.70 mi (255.40 km) |
| Rockville to Princeton (Texas) | 1,151.45 mi (1,853.09 km) |
| Rockville to Princeton Meadows (New Jersey) | 162.56 mi (261.62 km) |
| Rockville to Prineville (Oregon) | 2,256.37 mi (3,631.28 km) |
| Rockville to Prior Lake (Minnesota) | 921.58 mi (1,483.14 km) |
| Rockville to Progress (Pennsylvania) | 85.05 mi (136.87 km) |
| Rockville to Prospect Heights (Illinois) | 601.90 mi (968.67 km) |
| Rockville to Prosper (Texas) | 1,165.39 mi (1,875.51 km) |
| Rockville to Providence (Rhode Island) | 355.96 mi (572.86 km) |
| Rockville to Provo (Utah) | 1,824.63 mi (2,936.45 km) |
| Rockville to Prunedale (California) | 2,405.52 mi (3,871.31 km) |
| Rockville to Pueblo (Colorado) | 1,476.41 mi (2,376.05 km) |
| Rockville to Pueblo West (Colorado) | 1,481.46 mi (2,384.18 km) |
