ZIP codes

ZIP codes in Frederick County, Maryland

Frederick County has 35 ZIP codes. 24 lie entirely inside it and 11 are shared with neighboring counties, so part of their land and their people are elsewhere. About 288,213 people live in the parts inside it (ACS 2020–2024).

By the All Map Tools Team

ZIP codes: 35; With 1% or more of their land inside
Entirely inside: 24; 99% or more of their land
Shared with other counties: 11; Most with Carroll County (5)
Most populated ZIP: 21702; 49,605 people · Frederick
Least populated ZIP: 21705; 6 people · Frederick
Largest ZIP by land: 21771; 90 sq mi · Green Valley

Map of the ZIP codes in Frederick County

Entirely in the county (99% or more of its land)
Shared, mostly in this county
Shared, mostly in other counties
Neighboring counties

Open in the interactive tool

Each area is a ZIP code with its number where it fits. Hover over one to see its name.

All ZIP codes in Frederick County

35 ZIP codes in Frederick County, MD, by number
ZIP code	Main city	Population	Land in the county	Residents in the county
20842	—	2,369	23%	≈ 577
20871	Clarksburg	30,182	5.6%	≈ 1,428
21701	Frederick	43,048	100%	43,048
21702	Frederick	49,605	100%	49,605
21703	Ballenger Creek	41,960	100%	41,960
21704	Urbana	20,006	100%	20,006
21705	Frederick	6	100%	6
21710	Adamstown	4,661	100%	4,661
21714	Braddock Heights	95	100%	95
21716	Brunswick	7,200	100%	7,200
21717	Buckeystown	245	100%	245
21718	Burkittsville	134	100%	134
21719	Highfield-Cascade	1,178	2.6%	≈ 9
21727	Emmitsburg	6,052	100%	6,052
21754	Urbana	8,156	100%	8,156
21755	Jefferson	5,909	100%	5,909
21757	—	2,671	48%	≈ 1,499
21758	Garretts Mill	4,409	50%	≈ 3,516
21762	Libertytown	139	100%	139
21769	Middletown	11,965	99.3%	≈ 11,885
21770	Green Valley	8,751	100%	8,751
21771	Green Valley	33,031	51%	≈ 15,074
21773	Myersville	5,826	100%	5,826
21774	Linganore	17,134	100%	17,134
21776	New Windsor	6,261	21%	≈ 725
21777	Point of Rocks	2,462	100%	2,462
21778	—	745	100%	745
21780	Sabillasville	2,159	96%	≈ 1,781
21783	Cavetown	9,910	27%	≈ 1,189
21787	Taneytown	11,645	13%	≈ 414
21788	Thurmont	11,654	100%	11,654
21790	Point of Rocks	170	100%	170
21791	Union Bridge	5,340	61%	≈ 2,511
21793	Walkersville	10,719	100%	10,719
21798	Woodsboro	2,928	100%	2,928

ZIP codes shared with other counties

These 11 ZIP codes have part of their land in another county. The first figure is the share of their land in Frederick County; then, where the rest lies.

20842: 23% here; 77% in Montgomery County.
20871 (Clarksburg): 5.6% here; 94% in Montgomery County.
21719 (Highfield-Cascade): 2.6% here; 97% in Washington County.
21757: 48% here; 52% in Carroll County.
21758 (Garretts Mill): 50% here; 50% in Washington County.
21771 (Green Valley): 51% here; 26% in Carroll County, 18% in Howard County, and 4.2% in Montgomery County.
21776 (New Windsor): 21% here; 79% in Carroll County.
21780 (Sabillasville): 96% here; 4.3% in Washington County.
21783 (Cavetown): 27% here; 73% in Washington County.
21787 (Taneytown): 13% here; 87% in Carroll County.
21791 (Union Bridge): 61% here; 39% in Carroll County.

Cities and prefixes

By main city (the city, town or CDP each ZIP shares the most land with), the ones with the most are Frederick (3), Green Valley (2), Point of Rocks (2), Urbana (2), Adamstown (1), and Ballenger Creek (1); 27 places in all.

They start with 2 different three-digit prefixes, one per USPS sorting center: 208 and 217.

Neighboring counties

Each one with its ZIP codes. Those without a page of their own open in the tool.

Tools for this county

ZIP codes by county or city The same ZIP codes on an interactive map, with the list as CSV or to copy County map with cities Its cities, towns and CDPs with their population ZIP codes in a radius The ZIP codes within 10 miles of its center, or any distance you like

Sources

U.S. Census Bureau, 2020 ZCTA to County, ZCTA to Place and ZCTA to Census Tract Relationship Files (and the 2022 County Subdivision to ZCTA file for Connecticut). Public domain.
U.S. Census Bureau, American Community Survey 2020–2024 5-year estimates, table B01003 (population of each ZIP code, census tract and Connecticut town). Public domain.
U.S. Census Bureau, Vintage 2025 Population Estimates (county population) and 2025 Gazetteer Files (land area and interior point of each ZIP code). Public domain.
U.S. Census Bureau, Cartographic Boundary Files: ZCTAs 2020 and counties 2025, 1:500,000; county adjacency file 2025. Public domain.

How we count. ZIP codes here are the Census Bureau’s ZIP Code Tabulation Areas (ZCTAs), the areas it draws to match USPS ZIP codes; ZIPs with no area of their own (PO boxes, single buildings) aren’t included. A ZIP can cross county lines: “Land in the county” is the exact share of its land inside, from the Census relationship files. “Residents in the county” is the whole ZIP for those entirely inside; for shared ones it’s an estimate, spreading the people of each census tract over the land it shares with the ZIP. Population: ACS 2020–2024. Methodology.

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