Catonsville, MD ZIP Codes
Catonsville, Maryland has 2 ZIP codes: for street addresses and for a single organization.
Mail addressed to Catonsville covers nearby places too.
Where the 21228 ZIP code reaches
Tap or point to an area to see its ZIP code.Full-size map
21250 has no area on the map: it is a PO box or single-organization ZIP code. Dashed line: the Catonsville Census outline.
Map: Census Bureau ZIP Code Tabulation Areas (2020) and place limits (2024).
Check an address in Catonsville
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?
Catonsville PO box and business ZIP codes
| ZIP | Type and post office or station |
|---|---|
| 21228 | street delivery Catonsville |
| 21250 | one organization Catonsville |
ZIP codes from nearby towns that reach into Catonsville
- 21227, mailing town Halethorpe, covers 5 percent of Catonsville
- 21043, mailing town Ellicott City, covers 4 percent of Catonsville
- 21229, mailing town Baltimore, covers 3 percent of Catonsville
Why your mail may say Catonsville when you live outside it
Catonsville ZIP codes also cover Woodlawn, so a letter addressed to Catonsville can go to a home outside the town.
The reverse happens too: parts of Catonsville use 21227, 21043 and 21229, which mail under a neighboring town's name.
A ZIP code does not set your city, school district or tax. Baltimore County property records show which city you are in.
Catonsville ZIP code questions
What is the main ZIP code for Catonsville?
21228, the ZIP code of the main Catonsville post office at 1001 Frederick Rd.
What county is Catonsville in?
Baltimore County.
ZIP codes for towns near Catonsville
More towns near Catonsville: Pikesville, Severn, Glen Burnie, Owings Mills, Towson, Pasadena, Parkville, Dundalk, Odenton.
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