Frederick, MD ZIP Codes
Frederick, Maryland has 6 ZIP codes: 4 for street addresses (, , and ), 1 for PO boxes () and 1 for a single organization.
Your street decides which one you use.
Which Frederick ZIP code is my address in?
Street ranges from the Census Bureau, 2026. PO box and organization ZIP codes are not found by street. A new street may be missing: address not found?
Frederick ZIP code map
Tap or point to an area to see its ZIP code.Full-size map
21705 and 21709 have no area on the map: they are PO box or single-organization ZIP codes. Dashed line: Frederick city limits.
Map: Census Bureau ZIP Code Tabulation Areas (2020) and place limits (2024).
All Frederick ZIP codes by type
| ZIP | Type and post office or station |
|---|---|
| 21701 | street delivery Frederick Sorting and Delivery Center |
| 21702 | street delivery College Estates |
| 21703 | street delivery Frederick Sorting and Delivery Center |
| 21704 | street delivery Frederick Sorting and Delivery Center |
| 21705 | PO boxes at the Frederick Sorting and Delivery Center post office Frederick Sorting and Delivery Center |
| 21709 | one organization Frederick Sorting and Delivery Center |
Why your mail may say Frederick when you live outside it
Frederick ZIP codes also cover Ballenger Creek, Braddock Heights and Urbana, so a letter addressed to Frederick can go to a home outside the city limits.
A ZIP code does not set your city, school district or tax. Frederick County property records show which city you are in.
Frederick ZIP code questions
What is the main ZIP code for Frederick?
21701, the ZIP code of the main Frederick Sorting and Delivery Center post office at 201 E Patrick St.
Which Frederick ZIP codes are for PO boxes only?
21705. Mail to it goes to boxes at the post office, not to street addresses.
What county is Frederick in?
Frederick County.
ZIP codes for towns near Frederick
More towns near Frederick: Eldersburg, Olney, Rockville, Ashburn, Aspen Hill, Sterling, Potomac, North Bethesda, Ellicott City.
Sources and last checked
USPS ZIP Locale Detail (October 1, 2026), GeoNames (CC BY 4.0), U.S. Census Bureau, HUD-USPS crosswalk.
Checked October 20, 2026. Sources · How we build our lists · Corrections