Eldersburg, MD ZIP Codes
Eldersburg, Maryland has 2 ZIP codes: 2 for street addresses ( and ).
Your street decides which one you use.
Which Eldersburg 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?
Eldersburg ZIP code map
Tap or point to an area to see its ZIP code.Full-size map
Dashed line: the Eldersburg Census outline.
Map: Census Bureau ZIP Code Tabulation Areas (2020) and place limits (2024).
All Eldersburg ZIP codes by type
| ZIP | Type and post office or station |
|---|---|
| 21104 | street delivery; mail may be addressed to Marriottsville Randallstown |
| 21784 | street delivery; mail may be addressed to Sykesville Sykesville |
ZIP codes from nearby towns that reach into Eldersburg
- 21797, mailing town Woodbine, covers 3 percent of Eldersburg
Why your mail may say Eldersburg when you live outside it
Eldersburg ZIP codes also cover Sykesville, so a letter addressed to Eldersburg can go to a home outside the town.
The reverse happens too: parts of Eldersburg use 21797, which mails under a neighboring town's name.
A ZIP code does not set your city, school district or tax. Carroll County property records show which city you are in.
Eldersburg ZIP code questions
What is the main ZIP code for Eldersburg?
21104, the ZIP code of the main Randallstown post office at 3608 Offutt Rd.
What county is Eldersburg in?
Carroll County.
ZIP codes for towns near Eldersburg
More towns near Eldersburg: Catonsville, Columbia, Towson, Olney, Baltimore, Montgomery Village, Clarksburg, Parkville, Gaithersburg.
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