| Gaithersburg to Pell City (Alabama) | 633.60 mi (1,019.68 km) |
| Gaithersburg to Pella (Iowa) | 841.49 mi (1,354.24 km) |
| Gaithersburg to Pembroke Pines (Florida) | 924.53 mi (1,487.89 km) |
| Gaithersburg to Pendleton (Oregon) | 2,145.02 mi (3,452.08 km) |
| Gaithersburg to Pensacola (Florida) | 824.37 mi (1,326.69 km) |
| Gaithersburg to Peoria (Arizona) | 1,971.80 mi (3,173.30 km) |
| Gaithersburg to Peoria (Illinois) | 665.83 mi (1,071.55 km) |
| Gaithersburg to Perris (California) | 2,235.42 mi (3,597.57 km) |
| Gaithersburg to Perry (Georgia) | 587.17 mi (944.96 km) |
| Gaithersburg to Perry Hall (Maryland) | 43.59 mi (70.15 km) |
| Gaithersburg to Perrysburg (Ohio) | 376.94 mi (606.63 km) |
| Gaithersburg to Perth Amboy (New Jersey) | 183.05 mi (294.59 km) |
| Gaithersburg to Peru (Indiana) | 482.44 mi (776.42 km) |
| Gaithersburg to Petal (Mississippi) | 864.54 mi (1,391.35 km) |
| Gaithersburg to Petaluma (California) | 2,423.96 mi (3,900.99 km) |
