| Rockville to Pottstown (Pennsylvania) | 113.85 mi (183.22 km) |
| Rockville to Pottsville (Pennsylvania) | 121.17 mi (195.01 km) |
| Rockville to Poughkeepsie (New York) | 248.01 mi (399.14 km) |
| Rockville to Poulsbo (Washington) | 2,324.01 mi (3,740.13 km) |
| Rockville to Poway (California) | 2,248.39 mi (3,618.43 km) |
| Rockville to Powder Springs (Georgia) | 551.83 mi (888.08 km) |
| Rockville to Powell (Ohio) | 324.17 mi (521.71 km) |
| Rockville to Powell (Tennessee) | 431.22 mi (693.98 km) |
| Rockville to Prairie Ridge (Washington) | 2,302.45 mi (3,705.44 km) |
| Rockville to Prairie Village (Kansas) | 936.75 mi (1,507.55 km) |
| Rockville to Prairieville (Louisiana) | 988.84 mi (1,591.39 km) |
| Rockville to Prattville (Alabama) | 693.10 mi (1,115.44 km) |
| Rockville to Preakness (New Jersey) | 201.18 mi (323.78 km) |
| Rockville to Prescott (Arizona) | 1,963.72 mi (3,160.30 km) |
| Rockville to Prescott Valley (Arizona) | 1,956.51 mi (3,148.70 km) |
