Washington County, Maryland ZIP codes
23 ZIP codes are in Washington County, plus 3 that cross in from neighboring counties. It's part of the Hagerstown-Martinsburg, MD-WV metro area.
- ZIP codes
- 23
- Population in these ZIPs
- 155,449
- Avg. median income
- $77,800population-weighted
- Cities & towns
- 18
Click anywhere on the map to see which ZIP code it's in.
ZIP codes in Washington County
| ZIP code | City | Population | Median income | Typical home value |
|---|---|---|---|---|
| 21711 | Big Pool | 929 | $91,250 | $352,700 |
| 21713 | Boonsboro | 9,846 | $96,199 | $409,300 |
| 21715 | Brownsville | 20 | — | — |
| 21719 | Cascade | 1,178 | $65,809 | $291,200 |
| 21720 PO Box | Cavetown | — | — | — |
| 21721 PO Box | Chewsville | — | — | — |
| 21722 | Clear Spring | 6,721 | $88,232 | $372,000 |
| 21733 | Fairplay | 1,275 | $109,896 | $411,100 |
| 21734 | Funkstown | 1,076 | $61,392 | $273,800 |
| 21740 | Hagerstown | 64,792 | $62,873 | $288,500 |
| 21741 PO Box | Hagerstown | — | — | — |
| 21742 | Hagerstown | 34,069 | $86,288 | $344,400 |
| 21746 | Hagerstown | 2,361 | — | — |
| 21747 PO Box | Hagerstown | — | — | — |
| 21749 PO Box | Hagerstown | — | — | — |
| 21750 | Hancock | 3,417 | $60,625 | $255,200 |
| 21756 | Keedysville | 3,640 | $101,786 | $461,600 |
| 21767 | Maugansville | 1,031 | $57,940 | $277,500 |
| 21779 | Rohrersville | 1,311 | — | $476,000 |
| 21781 | Saint James | 25 | — | — |
| 21782 | Sharpsburg | 3,704 | $94,130 | $350,100 |
| 21783 | Smithsburg | 9,910 | $100,750 | $370,300 |
| 21795 | Williamsport | 10,144 | $87,864 | $342,100 |
ZIP codes partly in Washington County
These ZIP codes are mostly in a neighboring county but cover part of Washington County.
| ZIP code | City | County | Population | Median income | Typical home value |
|---|---|---|---|---|---|
| 21758 | Knoxville | Frederick County | 4,409 | $111,528 | $461,300 |
| 21769 | Middletown | Frederick County | 11,965 | $151,563 | $558,100 |
| 21780 | Sabillasville | Frederick County | 2,159 | $83,785 | $405,200 |
Population and median household income: ACS 2020–2024 5-year estimates. Typical home value: Zillow Home Value Index (September 2026) where available, otherwise the ACS median owner-reported value. "PO Box" marks ZIP codes with no delivery area of their own. Methodology
Cities and towns in Washington County
Nearby counties
Frequently asked questions
How many ZIP codes are in Washington County, Maryland?
23 ZIP codes are mainly in Washington County, and 3 more ZIP codes from neighboring areas reach partly into it.
What cities are in Washington County?
ZIP codes in Washington County use the city names Big Pool, Boonsboro, Brownsville, Cascade, Cavetown, Chewsville, Clear Spring, Fairplay, Funkstown, Hagerstown, Hancock and Keedysville and others.
What metro area is Washington County in?
Washington County is part of the Hagerstown-Martinsburg, MD-WV metropolitan statistical area.