Frederick County, Maryland ZIP codes
32 ZIP codes are in Frederick County, plus 7 that cross in from neighboring counties. It's part of the Washington-Arlington-Alexandria, DC-VA-MD-WV metro area.
- ZIP codes
- 32
- Population in these ZIPs
- 304,509
- Avg. median income
- $128,100population-weighted
- Cities & towns
- 27
Click anywhere on the map to see which ZIP code it's in.
ZIP codes in Frederick County
| ZIP code | City | Population | Median income | Typical home value |
|---|---|---|---|---|
| 21701 | Frederick | 43,048 | $106,577 | $443,300 |
| 21702 | Frederick | 49,605 | $106,983 | $451,900 |
| 21703 | Frederick | 41,960 | $106,334 | $410,300 |
| 21704 | Frederick | 20,006 | $161,063 | $644,600 |
| 21705 | Frederick | 6 | — | — |
| 21709 PO Box | Frederick | — | — | — |
| 21710 | Adamstown | 4,661 | $163,864 | $653,400 |
| 21714 | Braddock Heights | 95 | $161,806 | $415,600 |
| 21716 | Brunswick | 7,200 | $109,382 | $413,000 |
| 21717 | Buckeystown | 245 | $158,413 | $430,600 |
| 21718 | Burkittsville | 134 | $93,500 | $576,400 |
| 21727 | Emmitsburg | 6,052 | $95,236 | $368,500 |
| 21754 | Ijamsville | 8,156 | $182,188 | $680,000 |
| 21755 | Jefferson | 5,909 | $137,417 | $560,000 |
| 21758 | Knoxville | 4,409 | $111,528 | $461,300 |
| 21759 PO Box | Ladiesburg | — | — | — |
| 21762 | Libertytown | 139 | — | $324,400 |
| 21769 | Middletown | 11,965 | $151,563 | $558,100 |
| 21770 | Monrovia | 8,751 | $183,571 | $652,500 |
| 21771 | Mount Airy | 33,031 | $157,302 | $625,900 |
| 21773 | Myersville | 5,826 | $161,908 | $547,500 |
| 21774 | New Market | 17,134 | $171,103 | $591,200 |
| 21775 PO Box | New Midway | — | — | — |
| 21777 | Point Of Rocks | 2,462 | $159,708 | $515,000 |
| 21778 | Rocky Ridge | 745 | $76,458 | $440,100 |
| 21780 | Sabillasville | 2,159 | $83,785 | $405,200 |
| 21788 | Thurmont | 11,654 | $98,856 | $391,500 |
| 21790 | Tuscarora | 170 | $77,656 | — |
| 21791 | Union Bridge | 5,340 | $93,015 | $444,900 |
| 21792 PO Box | Unionville | — | — | — |
| 21793 | Walkersville | 10,719 | $121,971 | $460,800 |
| 21798 | Woodsboro | 2,928 | $116,607 | $500,700 |
ZIP codes partly in Frederick County
These ZIP codes are mostly in a neighboring county but cover part of Frederick County.
| ZIP code | City | County | Population | Median income | Typical home value |
|---|---|---|---|---|---|
| 20842 | Dickerson | Montgomery County | 2,369 | $204,013 | $730,500 |
| 20871 | Clarksburg | Montgomery County | 30,182 | $177,523 | $624,100 |
| 21719 | Cascade | Washington County | 1,178 | $65,809 | $291,200 |
| 21757 | Keymar | Carroll County | 2,671 | $100,500 | $454,300 |
| 21776 | New Windsor | Carroll County | 6,261 | $133,409 | $481,500 |
| 21783 | Smithsburg | Washington County | 9,910 | $100,750 | $370,300 |
| 21787 | Taneytown | Carroll County | 11,645 | $91,682 | $395,600 |
Population and median household income: ACS 2020–2024 5-year estimates. Typical home value: Zillow Home Value Index (September 2026) where available, otherwise the ACS median owner-reported value. "PO Box" marks ZIP codes with no delivery area of their own. Methodology
Cities and towns in Frederick County
Nearby counties
Frequently asked questions
How many ZIP codes are in Frederick County, Maryland?
32 ZIP codes are mainly in Frederick County, and 7 more ZIP codes from neighboring areas reach partly into it.
What cities are in Frederick County?
ZIP codes in Frederick County use the city names Adamstown, Braddock Heights, Brunswick, Buckeystown, Burkittsville, Emmitsburg, Frederick, Ijamsville, Jefferson, Knoxville, Ladiesburg and Libertytown and others.
What metro area is Frederick County in?
Frederick County is part of the Washington-Arlington-Alexandria, DC-VA-MD-WV metropolitan statistical area.