ZIP codes

ZIP codes in Washington County, Wisconsin

Washington County has 17 ZIP codes. 5 lie entirely inside it and 12 are shared with neighboring counties, so part of their land and their people are elsewhere. About 138,430 people live in the parts inside it (ACS 2020–2024).

By the All Map Tools Team

ZIP codes: 17; 1 more just touches the border (under 1% of their land)
Entirely inside: 5; 99% or more of their land
Shared with other counties: 12; Most with Ozaukee County (5)
Most populated ZIP: 53095; 27,817 people · West Bend
Least populated ZIP: 53002; 2,584 people · Allenton
Largest ZIP by land: 53027; 91 sq mi · Hartford

Map of the ZIP codes in Washington County

Entirely in the county (99% or more of its land)
Shared, mostly in this county
Shared, mostly in other counties
Neighboring counties

Open in the interactive tool

Each area is a ZIP code with its number where it fits. Hover over one to see its name.

All ZIP codes in Washington County

17 ZIP codes in Washington County, WI, by number
ZIP code	Main city	Population	Land in the county	Residents in the county
53002	Allenton	2,584	98%	≈ 2,551
53010	Campbellsport	7,444	4.9%	≈ 388
53012	Cedarburg	19,183	31%	≈ 2,261
53017	Richfield	5,458	88%	≈ 4,615
53021	Fredonia	4,537	18%	≈ 679
53022	Germantown	20,046	100%	20,046
53027	Hartford	23,118	83%	≈ 22,305
53029	Hartland	21,778	3.2%	≈ 127
53033	Richfield	6,286	100%	6,286
53037	Jackson	10,254	100%	10,254
53040	Kewaskum	8,630	77%	≈ 7,770
53075	Random Lake	3,402	3.3%	≈ 124
53076	Richfield	3,109	100%	3,109
53086	Slinger	9,426	100%	9,426
53090	West Bend	21,625	97%	≈ 21,351
53091	Theresa	2,123	3.6%	≈ 70
53095	West Bend	27,817	94%	≈ 27,043

They also touch the county with under 1% of their land, so they aren’t counted: 53066.

ZIP codes shared with other counties

These 12 ZIP codes have part of their land in another county. The first figure is the share of their land in Washington County; then, where the rest lies.

53002 (Allenton): 98% here; 2.1% in Dodge County.
53010 (Campbellsport): 4.9% here; 95% in Fond du Lac County.
53012 (Cedarburg): 31% here; 69% in Ozaukee County.
53017 (Richfield): 88% here; 12% in Waukesha County.
53021 (Fredonia): 18% here; 81% in Ozaukee County.
53027 (Hartford): 83% here; 17% in Dodge County.
53029 (Hartland): 3.2% here; 97% in Waukesha County.
53040 (Kewaskum): 77% here; 13% in Sheboygan County and 11% in Fond du Lac County.
53075 (Random Lake): 3.3% here; 87% in Sheboygan County and 10% in Ozaukee County.
53090 (West Bend): 97% here; 3.1% in Ozaukee County.
53091 (Theresa): 3.6% here; 96% in Dodge County.
53095 (West Bend): 94% here; 6.1% in Ozaukee County.

Cities and prefixes

By main city (the city, town or CDP each ZIP shares the most land with), the ones with the most are Richfield (3), West Bend (2), Allenton (1), Campbellsport (1), Cedarburg (1), and Fredonia (1); 14 places in all.

All 17 start with the same three digits, 530: the prefix of the USPS sorting center that handles them.

Neighboring counties

Each one with its ZIP codes. Those without a page of their own open in the tool.

Tools for this county

ZIP codes by county or city The same ZIP codes on an interactive map, with the list as CSV or to copy County map with cities Its cities, towns and CDPs with their population ZIP codes in a radius The ZIP codes within 10 miles of its center, or any distance you like

Sources

U.S. Census Bureau, 2020 ZCTA to County, ZCTA to Place and ZCTA to Census Tract Relationship Files (and the 2022 County Subdivision to ZCTA file for Connecticut). Public domain.
U.S. Census Bureau, American Community Survey 2020–2024 5-year estimates, table B01003 (population of each ZIP code, census tract and Connecticut town). Public domain.
U.S. Census Bureau, Vintage 2025 Population Estimates (county population) and 2025 Gazetteer Files (land area and interior point of each ZIP code). Public domain.
U.S. Census Bureau, Cartographic Boundary Files: ZCTAs 2020 and counties 2025, 1:500,000; county adjacency file 2025. Public domain.

How we count. ZIP codes here are the Census Bureau’s ZIP Code Tabulation Areas (ZCTAs), the areas it draws to match USPS ZIP codes; ZIPs with no area of their own (PO boxes, single buildings) aren’t included. A ZIP can cross county lines: “Land in the county” is the exact share of its land inside, from the Census relationship files. “Residents in the county” is the whole ZIP for those entirely inside; for shared ones it’s an estimate, spreading the people of each census tract over the land it shares with the ZIP. Population: ACS 2020–2024. Methodology.

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