Frederick County, Maryland ZIP Codes
- ZIP records
27 - Cities represented
23 - Sum of listed ZIP population estimates
300,100
Population sum includes positive estimates in these ZIP records; it is not an official county population.
Top ZIP Codes by Population
| Rank | ZIP Code | City | Population estimate |
|---|---|---|---|
| 1 | 21702 | Frederick | 49,605 |
| 2 | 21701 | Frederick | 43,048 |
| 3 | 21703 | Frederick | 41,960 |
| 4 | 21771 | Mount Airy | 33,031 |
| 5 | 21704 | Frederick | 20,006 |
| 6 | 21774 | New Market | 17,134 |
| 7 | 21769 | Middletown | 11,965 |
| 8 | 21788 | Thurmont | 11,654 |
| 9 | 21793 | Walkersville | 10,719 |
| 10 | 21770 | Monrovia | 8,751 |
Cities in Frederick County
- Adamstown
- Braddock Heights
- Brunswick
- Buckeystown
- Burkittsville
- Emmitsburg
- Frederick
- Ijamsville
- Jefferson
- Libertytown
- Middletown
- Monrovia
- Mount Airy
- Myersville
- New Market
- Point Of Rocks
- Rocky Ridge
- Sabillasville
- Thurmont
- Tuscarora
- Union Bridge
- Walkersville
- Woodsboro
ZIP Directory
- ZIP 21701
- ZIP 21702
- ZIP 21703
- ZIP 21704
- ZIP 21705
- ZIP 21710
- ZIP 21714
- ZIP 21716
- ZIP 21717
- ZIP 21718
- ZIP 21727
- ZIP 21754
- ZIP 21755
- ZIP 21762
- ZIP 21769
- ZIP 21770
- ZIP 21771
- ZIP 21773
- ZIP 21774
- ZIP 21777
- ZIP 21778
- ZIP 21780
- ZIP 21788
- ZIP 21790
- ZIP 21791
- ZIP 21793
- ZIP 21798
Browse all ZIP data for Maryland
Methodology: Records are grouped by the source file's listed county and state. Population sums add positive ZIP-level estimates and are not official county totals; city counts use distinct city labels in the source.