| Gaithersburg to Petersburg (Virginia) | 133.72 mi (215.20 km) |
| Gaithersburg to Pflugerville (Texas) | 1,298.98 mi (2,090.51 km) |
| Gaithersburg to Pharr (Texas) | 1,507.54 mi (2,426.15 km) |
| Gaithersburg to Phelan (California) | 2,235.60 mi (3,597.84 km) |
| Gaithersburg to Phenix City (Alabama) | 635.45 mi (1,022.65 km) |
| Gaithersburg to Philadelphia (Pennsylvania) | 126.10 mi (202.93 km) |
| Gaithersburg to Phillipsburg (New Jersey) | 152.06 mi (244.72 km) |
| Gaithersburg to Phoenix (Arizona) | 1,965.87 mi (3,163.75 km) |
| Gaithersburg to Phoenixville (Pennsylvania) | 113.58 mi (182.79 km) |
| Gaithersburg to Picayune (Mississippi) | 921.74 mi (1,483.40 km) |
| Gaithersburg to Pickerington (Ohio) | 300.59 mi (483.76 km) |
| Gaithersburg to Pico Rivera (California) | 2,276.72 mi (3,664.03 km) |
| Gaithersburg to Piedmont (California) | 2,411.36 mi (3,880.71 km) |
| Gaithersburg to Pierre (South Dakota) | 1,240.05 mi (1,995.68 km) |
| Gaithersburg to Pike Creek Valley (Delaware) | 90.66 mi (145.90 km) |
