County · Maryland · United States
Montgomery County ZIP codes
48 ZIP codes · 29 cities · FIPS 24031
Key facts
- State
- Maryland (MD)
- FIPS code
- 24031
- Population
- 1,057,586
- Median household income
- $128,733
- Median age
- 40.1
- Land area
- 493.1 sq mi (1,277.2 km²)
- Population density
- 2,145 / sq mi
- Area codes
- 227, 240, 301
Cities and ZIP codes in Montgomery County (29)
About this page
County figures are Census county-level values (ACS 5-year); the ZIP list shows the ZIPs whose primary county this is — a ZIP on a border can also serve neighbouring counties.
Sources: U.S. Census Bureau (2020 county relationship file, ACS 5-year) · GeoNames. Methodology.