Most populous ZIP codes in Maryland
Top 25 most populous ZIP codes in Maryland. #1 is 20906 (Aspen Hill) with about 71,216 residents. Compare population, income, and housing on US5.
These ZIP codes have the largest populations in Maryland. Population totals are aggregated from published ZIP-area Census estimates on US5.
The largest codes are 20906 (Aspen Hill) with about 71,216 residents; 20878 (Gaithersburg) with about 65,236 residents; 21234 (Carney) with about 65,010 residents.
Open any ZIP for a full demographics, income, and housing profile, or return to the Maryland state page for the complete ZIP table.
Ranked ZIP codes
| # | ZIP | City | County | Population | Population | Income | Home value |
|---|---|---|---|---|---|---|---|
| 1 | 20906 | Aspen Hill | Montgomery County | 71,216 | 71,216 | $92,964 | $440,600 |
| 2 | 20878 | Gaithersburg | Montgomery County | 65,236 | 65,236 | $142,062 | $675,200 |
| 3 | 21234 | Carney | Baltimore County | 65,010 | 65,010 | $83,139 | $276,000 |
| 4 | 21740 | Hagerstown | Washington County | 63,140 | 63,140 | $59,410 | $241,600 |
| 5 | 20874 | Darnestown | Montgomery County | 62,233 | 62,233 | $109,648 | $385,300 |
| 6 | 21122 | Lake Shore | Anne Arundel County | 61,589 | 61,589 | $121,732 | $412,100 |
| 7 | 21117 | Owings Mills | Baltimore County | 61,337 | 61,337 | $100,934 | $370,700 |
| 8 | 21222 | Dundalk | Baltimore County | 58,935 | 58,935 | $61,934 | $200,800 |
| 9 | 20904 | Colesville | Montgomery County | 57,244 | 57,244 | $93,322 | $533,500 |
| 10 | 21061 | Glen Burnie | Anne Arundel County | 56,453 | 56,453 | $86,081 | $326,000 |
| 11 | 20744 | Fort Washington | Prince George's County | 56,236 | 56,236 | $124,838 | $418,100 |
| 12 | 20902 | Wheaton | Montgomery County | 53,170 | 53,170 | $111,408 | $531,200 |
| 13 | 20772 | Croom | Prince George's County | 52,768 | 52,768 | $135,576 | $443,500 |
| 14 | 20774 | Brock Hall | Prince George's County | 52,221 | 52,221 | $128,392 | $439,500 |
| 15 | 21215 | Baltimore | Baltimore city | 52,078 | 52,078 | $47,606 | $189,900 |
| 16 | 20783 | Adelphi | Prince George's County | 50,893 | 50,893 | $87,052 | $400,400 |
| 17 | 20850 | Rockville | Montgomery County | 50,365 | 50,365 | $122,691 | $687,200 |
| 18 | 21206 | Baltimore | Baltimore city | 49,901 | 49,901 | $62,965 | $213,700 |
| 19 | 20854 | Potomac | Montgomery County | 49,694 | 49,694 | $250,001 | $1,105,300 |
| 20 | 21207 | Lochearn | Baltimore County | 49,599 | 49,599 | $64,284 | $248,400 |
| 21 | 21228 | Catonsville | Baltimore County | 49,417 | 49,417 | $107,714 | $389,200 |
| 22 | 20852 | North Bethesda | Montgomery County | 47,857 | 47,857 | $121,496 | $646,100 |
| 23 | 21702 | Frederick | Frederick County | 47,437 | 47,437 | $104,659 | $384,800 |
| 24 | 21043 | Ellicott City | Howard County | 47,134 | 47,134 | $141,846 | $607,300 |
| 25 | 21224 | Baltimore | Baltimore city | 46,949 | 46,949 | $86,209 | $281,400 |
Frequently asked questions
What are the most populous ZIP codes in Maryland?
The largest ZIP on this board is 20906 (Aspen Hill) with about 71,216 residents. See the ranked table for the full top 25.
How does US5 rank ZIP codes in Maryland?
We rank indexable ZIP codes by population from high to low.
Where can I explore all ZIP codes in Maryland?
Visit the Maryland state page for the full ZIP table, demographics summary, and sortable income/housing columns.