| Rockville to Petaluma (California) | 2,427.79 mi (3,907.16 km) |
| Rockville to Petersburg (Virginia) | 130.46 mi (209.96 km) |
| Rockville to Pflugerville (Texas) | 1,300.60 mi (2,093.11 km) |
| Rockville to Pharr (Texas) | 1,508.45 mi (2,427.62 km) |
| Rockville to Phelan (California) | 2,238.96 mi (3,603.26 km) |
| Rockville to Phenix City (Alabama) | 635.22 mi (1,022.30 km) |
| Rockville to Philadelphia (Pennsylvania) | 125.20 mi (201.50 km) |
| Rockville to Phillipsburg (New Jersey) | 152.49 mi (245.41 km) |
| Rockville to Phoenix (Arizona) | 1,968.95 mi (3,168.72 km) |
| Rockville to Phoenixville (Pennsylvania) | 113.42 mi (182.53 km) |
| Rockville to Picayune (Mississippi) | 922.16 mi (1,484.07 km) |
| Rockville to Pickerington (Ohio) | 304.36 mi (489.82 km) |
| Rockville to Pico Rivera (California) | 2,280.06 mi (3,669.41 km) |
| Rockville to Piedmont (California) | 2,415.15 mi (3,886.81 km) |
| Rockville to Pierre (South Dakota) | 1,244.34 mi (2,002.57 km) |
