Rockville, MD ZIP Codes
Rockville, Maryland has 8 ZIP codes: 4 for street addresses (, , and ), 3 for PO boxes (, and ) and 1 for a single organization.
Your street decides which one you use.
Which Rockville 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?
Rockville ZIP code map
Tap or point to an area to see its ZIP code.Full-size map
20847, 20848, 20849 and 20857 have no area on the map: they are PO box or single-organization ZIP codes. Dashed line: Rockville city limits.
Map: Census Bureau ZIP Code Tabulation Areas (2020) and place limits (2024).
All Rockville ZIP codes by type
| ZIP | Type and post office or station |
|---|---|
| 20847 | PO boxes at the Pike post office Pike |
| 20848 | PO boxes at the Twinbrook post office Twinbrook |
| 20849 | PO boxes at the Rockville post office Rockville |
| 20850 | street delivery Rockville |
| 20851 | street delivery Twinbrook |
| 20852 | street delivery Rockville Carrier Annex |
| 20853 | street delivery Twinbrook |
| 20857 | one organization Rockville |
ZIP codes from nearby towns that reach into Rockville
- 20854, mailing town Potomac, covers 10 percent of Rockville
Why your mail may say Rockville when you live outside it
Rockville ZIP codes also cover Aspen Hill, North Bethesda and North Potomac, so a letter addressed to Rockville can go to a home outside the city limits.
The reverse happens too: parts of Rockville use 20854, which mails 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.
Rockville ZIP code questions
What is the main ZIP code for Rockville?
20850, the ZIP code of the main Rockville post office at 500 N Washington St.
Which Rockville ZIP codes are for PO boxes only?
20847, 20848 and 20849. Mail to them goes to boxes at the post office, not to street addresses.
What county is Rockville in?
Montgomery County.
ZIP codes for towns near Rockville
More towns near Rockville: Bethesda, Montgomery Village, Germantown, Silver Spring, McLean, Clarksburg, Chillum, College Park, Reston.
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