| Zip Code | Primary City | Secondary City | More Information |
| 20886 | Montgomery Village | Gaithersburg | Gaithersburg population stats |
| 20877 | Gaithersburg | Gaithersburg | Gaithersburg population stats |
| 20878 | Gaithersburg | Gaithersburg | Gaithersburg population stats |
| 20879 | Gaithersburg | Gaithersburg | Gaithersburg population stats |
| 20882 | Gaithersburg | Gaithersburg | Gaithersburg population stats |
| 20884 | Gaithersburg | Gaithersburg | Gaithersburg population stats |
| 20885 | Gaithersburg | Gaithersburg | Gaithersburg population stats |
| 20898 | Gaithersburg | Gaithersburg | Gaithersburg population stats |
| 20899 | Gaithersburg | Gaithersburg | Gaithersburg population stats |