| Gaithersburg to Portage (Michigan) | 487.16 mi (784.01 km) |
| Gaithersburg to Portage (Wisconsin) | 704.04 mi (1,133.04 km) |
| Gaithersburg to Portales (New Mexico) | 1,483.49 mi (2,387.44 km) |
| Gaithersburg to Porterville (California) | 2,278.97 mi (3,667.65 km) |
| Gaithersburg to Portland (Maine) | 477.10 mi (767.82 km) |
| Gaithersburg to Portland (Oregon) | 2,330.33 mi (3,750.30 km) |
| Gaithersburg to Portland (Tennessee) | 537.09 mi (864.37 km) |
| Gaithersburg to Portland (Texas) | 1,389.82 mi (2,236.69 km) |
| Gaithersburg to Portsmouth (New Hampshire) | 430.58 mi (692.96 km) |
| Gaithersburg to Portsmouth (Ohio) | 309.06 mi (497.39 km) |
| Gaithersburg to Portsmouth (Virginia) | 164.85 mi (265.29 km) |
| Gaithersburg to Post Falls (Idaho) | 2,054.62 mi (3,306.59 km) |
| Gaithersburg to Potomac (Maryland) | 8.39 mi (13.50 km) |
| Gaithersburg to Potomac Park (California) | 2,290.83 mi (3,686.73 km) |
| Gaithersburg to Pottstown (Pennsylvania) | 113.59 mi (182.80 km) |
