| Gaithersburg to Parma Heights (Ohio) | 285.90 mi (460.12 km) |
| Gaithersburg to Parole (Maryland) | 36.93 mi (59.43 km) |
| Gaithersburg to Parsippany (New Jersey) | 190.36 mi (306.35 km) |
| Gaithersburg to Pasadena (California) | 2,275.22 mi (3,661.61 km) |
| Gaithersburg to Pasadena (Maryland) | 35.36 mi (56.91 km) |
| Gaithersburg to Pasadena (Texas) | 1,210.79 mi (1,948.58 km) |
| Gaithersburg to Pasadena Hills (Florida) | 802.77 mi (1,291.93 km) |
| Gaithersburg to Pascagoula (Mississippi) | 882.52 mi (1,420.28 km) |
| Gaithersburg to Pasco (Washington) | 2,158.16 mi (3,473.23 km) |
| Gaithersburg to Passaic (New Jersey) | 202.05 mi (325.16 km) |
| Gaithersburg to Pataskala (Ohio) | 299.19 mi (481.49 km) |
| Gaithersburg to Patchogue (New York) | 248.98 mi (400.69 km) |
| Gaithersburg to Paterson (New Jersey) | 202.91 mi (326.55 km) |
| Gaithersburg to Patterson (California) | 2,361.75 mi (3,800.87 km) |
| Gaithersburg to Pawtucket (Rhode Island) | 360.33 mi (579.89 km) |
