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County ZIP codes · Maryland · FIPS 24043

Washington County, MD ZIP Codes

Washington County, Maryland has 25 ZIP codes (Census 2020 ZCTA-county file; GeoNames postal codes, October 2026): 20 residential and 5 for PO boxes or a single organization. 18 of the residential ones lie mainly in Washington County and 2 mainly in a neighboring county; 4 cross the county line. Median household income ranges from $62,873 in 21740 (Hagerstown) to $111,528 in 21758 (Knoxville) (Census Bureau, ACS 2020-2024).

  • ACS2020-24
  • Census2020

Where are the ZIP codes of Washington County?

21711 · Big Pool: $91k21713 · Boonsboro: $96k21715 · Brownsville: –21719 · Cascade: $66k21722 · Clear Spring: $88k21733 · Fairplay: $110k21734 · Funkstown: $61k21740 · Hagerstown: $63k21742 · Hagerstown: $86k21746 · Hagerstown: –21750 · Hancock: $61k21756 · Keedysville: $102k21758 · Knoxville: $112k21767 · Maugansville: $58k21779 · Rohrersville: –21780 · Sabillasville: $84k21781 · Saint James: –21782 · Sharpsburg: $94k21783 · Smithsburg: $101k21795 · Williamsport: $88k21740217502172221783217822171321742217952175821756217802171121779217332171921711 · Big Pool: $91k21713 · Boonsboro: $96k21715 · Brownsville: –21719 · Cascade: $66k21722 · Clear Spring: $88k21733 · Fairplay: $110k21734 · Funkstown: $61k21740 · Hagerstown: $63k21742 · Hagerstown: $86k21746 · Hagerstown: –21750 · Hancock: $61k21756 · Keedysville: $102k21758 · Knoxville: $112k21767 · Maugansville: $58k21779 · Rohrersville: –21780 · Sabillasville: $84k21781 · Saint James: –21782 · Sharpsburg: $94k21783 · Smithsburg: $101k21795 · Williamsport: $88k2174021750217222178321782217132174221795217582178021711217792173321711 · Big Pool: $91k21713 · Boonsboro: $96k21715 · Brownsville: –21719 · Cascade: $66k21722 · Clear Spring: $88k21733 · Fairplay: $110k21734 · Funkstown: $61k21740 · Hagerstown: $63k21742 · Hagerstown: $86k21746 · Hagerstown: –21750 · Hancock: $61k21756 · Keedysville: $102k21758 · Knoxville: $112k21767 · Maugansville: $58k21779 · Rohrersville: –21780 · Sabillasville: $84k21781 · Saint James: –21782 · Sharpsburg: $94k21783 · Smithsburg: $101k21795 · Williamsport: $88k2174021750217222178321782217132179521758
The residential ZIP codes of Washington County (whole outlines, including the parts in neighboring counties), shaded by median household income in national fifths (ACS 2020-2024). <$54.1k$98.1k+no figure

Source: U.S. Census Bureau, 2020 ZCTA cartographic boundaries; ACS 2020-2024 5-year estimates (B19013).

How different are its ZIP codes?

The middle half of its ranked ZIP codes (1,000+ people living in households) report median household incomes between $86,288 and $96,199.

They carry 18 postal town names.

Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B19013).

All 20 residential ZIP codes in Washington County

18 ZIP codes lie mainly in Washington County; 2 more reach into it from a neighboring county and follow the first table.

Residential ZIP codes mainly in Washington County, largest first; "In this county" is the share of the ZIP's land in the county
In this county
21740 Hagerstown 64,792 914 $63k $262k 100%
21742 Hagerstown 34,069 733 $86k $305k 100%
21795 Williamsport 10,144 316 $88k $296k 100%
21783 Smithsburg 9,910 208 $101k $340k 73%
21713 Boonsboro 9,846 249 $96k $369k 100%
21722 Clear Spring 6,721 118 $88k $313k 100%
21782 Sharpsburg 3,704 126 $94k $312k 100%
21756 Keedysville 3,640 156 $102k $413k 100%
21750 Hancock 3,417 55 $61k $233k 100%
21746 Hagerstown 2,361 8,977 – – 100%
21779 Rohrersville 1,311 135 – $609k 100%
21733 Fairplay 1,275 218 $110k $292k 100%
21719 Cascade 1,178 285 $66k $214k 97%
21734 Funkstown 1,076 2,228 $61k $278k 100%
21767 Maugansville 1,031 2,997 $58k $259k 100%
21711 Big Pool 929 38 $91k $311k 100%
21781 Saint James 25 104 – – 100%
21715 Brownsville 20 81 – – 100%

Partly in Washington County

Residential ZIP codes mainly in another county that reach at least 1% into Washington County, by their share here
In this county
21758 Knoxville 4,409 138 $112k $425k 50%
21780 Sabillasville 2,159 98 $84k $452k 4%

Download the 25 ZIP codes as CSV

Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates; county shares by land area (Census 2020 ZCTA-county relationship file).

Which ZIP codes cross the county line?

4 ZIP codes of Washington County extend into another county. A ZIP code follows mail routes, not county borders.

Share of each ZIP code's land in Washington County and in the neighboring counties
ZIPIn WashingtonElsewhere
2178373%Frederick County 27%
2175850%Frederick County 50%
217804%Frederick County 96%
2171997%Frederick County 3%

Source: U.S. Census Bureau, 2020 ZCTA-county relationship file (shares of land area).

PO Box and single-organization ZIP codes

ZIP codes in Washington County without a residential area (GeoNames postal codes)
ZIPPostal name
21720Cavetown
21721Chewsville
21741Hagerstown
21747Hagerstown
21749Hagerstown

Source: GeoNames postal codes (CC BY 4.0).

Which first three digits do Washington County's ZIP codes use?

The first three digits of a ZIP code name the sectional center, the mail processing plant that sorts it. Every ZIP code of Washington County starts with 217.

Three-digit prefixes of Washington County's ZIP codes, the sectional center for each (USPS labeling list L005, effective October 1, 2026) and how many of the prefix's codes are Washington County's
PrefixSectional centerHereAll codes
217 Baltimore, MD (SCF 212) 25 66

Source: U.S. Postal Service, labeling list L005 (3-digit ZIP Code prefix groups, SCF sortation), effective October 1, 2026.