Montgomery County ZIP Codes
Montgomery County is a county of Maryland.
- ZIP codes
- 76
- Cities & towns
- 30
- Area codes
- 3
- Land area
- 493 sq mi
Every ZIP code in Montgomery County
| ZIP code | City |
|---|---|
| 20810 | Bethesda |
| 20811 | Bethesda |
| 20812 | Glen Echo |
| 20813 | Bethesda |
| 20814 | Bethesda |
| 20815 | Chevy Chase |
| 20816 | Bethesda |
| 20817 | Bethesda |
| 20818 | Cabin John |
| 20824 | Bethesda |
| 20825 | Chevy Chase |
| 20827 | Bethesda |
| 20830 | Olney |
| 20832 | Olney |
| 20833 | Brookeville |
| 20837 | Poolesville |
| 20838 | Barnesville |
| 20839 | Beallsville |
| 20841 | Boyds |
| 20842 | Dickerson |
| 20847 | Rockville |
| 20848 | Rockville |
| 20849 | Rockville |
| 20850 | Rockville |
| 20851 | Rockville |
| 20852 | Rockville |
| 20853 | Rockville |
| 20854 | Potomac |
| 20855 | Derwood |
| 20857 | Rockville |
| 20859 | Potomac |
| 20860 | Sandy Spring |
| 20861 | Ashton |
| 20862 | Brinklow |
| 20866 | Burtonsville |
| 20868 | Spencerville |
| 20871 | Clarksburg |
| 20872 | Damascus |
| 20874 | Germantown |
| 20875 | Germantown |
| 20876 | Germantown |
| 20877 | Gaithersburg |
| 20878 | Gaithersburg |
| 20879 | Gaithersburg |
| 20880 | Washington Grove |
| 20882 | Gaithersburg |
| 20883 | Gaithersburg |
| 20884 | Gaithersburg |
| 20885 | Gaithersburg |
| 20886 | Montgomery Village |
| 20889 | Bethesda |
| 20891 | Kensington |
| 20892 | Bethesda |
| 20894 | Bethesda |
| 20895 | Kensington |
| 20896 | Garrett Park |
| 20897 | Suburb Maryland Fac |
| 20898 | Gaithersburg |
| 20899 | Gaithersburg |
| 20901 | Silver Spring |
| 20902 | Silver Spring |
| 20903 | Silver Spring |
| 20904 | Silver Spring |
| 20905 | Silver Spring |
| 20906 | Silver Spring |
| 20907 | Silver Spring |
| 20908 | Silver Spring |
| 20910 | Silver Spring |
| 20911 | Silver Spring |
| 20912 | Takoma Park |
| 20914 | Silver Spring |
| 20915 | Silver Spring |
| 20916 | Silver Spring |
| 20918 | Silver Spring |
| 20993 | Silver Spring |
| 20997 | Silver Spring |
We do not publish a delivery type (standard, PO box, unique) or a neighbourhood for each ZIP. USPS delivery-type products are licensed, and no clean-rights source maps ZIP codes to neighbourhoods — so the Montgomery County codes above are listed without a column we would have to invent.
Cities and towns in Montgomery County
A further 16 places in Montgomery County appear in the postal source without a page of its own; their codes are in the table above and each one links to its own page.
Area codes covering Montgomery County
Telephone and postal boundaries are drawn by different bodies, so these codes overlap the county without matching its edges.
Where Montgomery County's ZIP codes sit
- Reference points and footprint
- Not an official NANPA boundary
- Not a USPS delivery area
Scope every ZIP code recorded in Montgomery County. Source GeoNames US postal codes (2026-07 postal dump), Census 2024 county Gazetteer (2024 Gazetteer) and geoinfo-dataset (full_dataset) ZIP→NPA (2018 snapshot). Updated . The outline is a convex envelope of ZIP reference points, not a jurisdiction boundary.