Columbia, MD ZIP Codes
Columbia, Maryland has 3 ZIP codes: 3 for street addresses (, and ).
Your street decides which one you use.
Which Columbia 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?
Columbia ZIP code map
Tap or point to an area to see its ZIP code.Full-size map
Dashed line: the Columbia Census outline.
Map: Census Bureau ZIP Code Tabulation Areas (2020) and place limits (2024).
All Columbia ZIP codes by type
| ZIP | Type and post office or station |
|---|---|
| 21044 | street delivery American Cities |
| 21045 | street delivery Columbia Sorting and Delivery Center |
| 21046 | street delivery Columbia Sorting and Delivery Center |
ZIP codes from nearby towns that reach into Columbia
- 21029, mailing town Clarksville, covers 9 percent of Columbia
Why your mail may say Columbia when you live outside it
A letter addressed to Columbia can go to a home outside the town, because ZIP areas follow delivery routes, not town lines.
The reverse happens too: parts of Columbia use 21029, which mails under a neighboring town's name.
A ZIP code does not set your city, school district or tax. Howard County property records show which city you are in.
Columbia ZIP code questions
What is the main ZIP code for Columbia?
21045, the ZIP code of the main Columbia Sorting and Delivery Center post office at 6801 Oak Hall Ln.
What county is Columbia in?
Howard County.
ZIP codes for towns near Columbia
More towns near Columbia: Randallstown, Odenton, Glen Burnie, Aspen Hill, College Park, Eldersburg, Owings Mills, Baltimore, Wheaton.
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