| Zip Code | Primary City | Secondary City | More Information |
| 20854 | Potomac | Rockville | Rockville population stats |
| 20855 | Derwood | Rockville | Rockville population stats |
| 20859 | Potomac | Rockville | Rockville population stats |
| 20847 | Rockville | Rockville | Rockville population stats |
| 20848 | Rockville | Rockville | Rockville population stats |
| 20850 | Rockville | Rockville | Rockville population stats |
| 20851 | Rockville | Rockville | Rockville population stats |
| 20852 | Rockville | Rockville | Rockville population stats |
| 20853 | Rockville | Rockville | Rockville population stats |
| 20857 | Rockville | Rockville | Rockville population stats |