Olney, MD ZIP Codes
Olney, Maryland has 4 ZIP codes: 3 for street addresses (, and ) and 1 for PO boxes ().
Your street decides which one you use.
Which Olney 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?
Olney ZIP code map
Tap or point to an area to see its ZIP code.Full-size map
20830 has no area on the map: it is a PO box or single-organization ZIP code. Dashed line: the Olney Census outline.
Map: Census Bureau ZIP Code Tabulation Areas (2020) and place limits (2024).
All Olney ZIP codes by type
| ZIP | Type and post office or station |
|---|---|
| 20830 | PO boxes at the Olney post office Olney |
| 20832 | street delivery Olney |
| 20833 | street delivery; mail may be addressed to Brookeville Brookeville |
| 20853 | street delivery; mail may be addressed to Rockville Twinbrook |
ZIP codes from nearby towns that reach into Olney
- 20906, mailing town Silver Spring, covers 8 percent of Olney
- 20860, mailing town Sandy Spring, covers 5 percent of Olney
Why your mail may say Olney when you live outside it
Olney ZIP codes also cover Aspen Hill and Brookeville, so a letter addressed to Olney can go to a home outside the town.
The reverse happens too: parts of Olney use 20906 and 20860, which mail under a neighboring town's name.
A ZIP code does not set your city, school district or tax. Montgomery County property records show which city you are in.
Olney ZIP code questions
What is the main ZIP code for Olney?
20832, the ZIP code of the main Olney post office at 3570 Olney Laytonsville Rd.
Which Olney ZIP codes are for PO boxes only?
20830. Mail to it goes to boxes at the post office, not to street addresses.
What county is Olney in?
Montgomery County.
ZIP codes for towns near Olney
More towns near Olney: Silver Spring, Germantown, Bethesda, Potomac, Clarksburg, Columbia, College Park, Chillum, McLean.
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