ZIP codes

ZIP codes in Washington County, Minnesota

Washington County has 19 ZIP codes. 14 lie entirely inside it and 5 are shared with neighboring counties, so part of their land and their people are elsewhere. About 276,601 people live in the parts inside it (ACS 2020–2024).

By the All Map Tools Team

ZIP codes: 19; With 1% or more of their land inside
Entirely inside: 14; 99% or more of their land
Shared with other counties: 5; Most with Anoka County (3)
Most populated ZIP: 55125; 44,185 people · Woodbury
Least populated ZIP: 55090; 401 people · Willernie
Largest ZIP by land: 55082; 79 sq mi · Grant

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

19 ZIP codes in Washington County, MN, by number
ZIP code	Main city	Population	Land in the county	Residents in the county
55001	Afton	3,027	100%	3,027
55003	Bayport	3,905	100%	3,905
55016	Cottage Grove	40,695	100%	40,695
55025	Columbus	25,891	39%	≈ 19,513
55033	Hastings	29,674	21%	≈ 4,464
55038	Hugo	25,061	70%	≈ 14,357
55042	Lake Elmo	13,705	100%	13,705
55043	Lakeland	3,424	100%	3,424
55047	Scandia	2,244	100%	2,244
55055	Newport	4,754	100%	4,754
55071	St. Paul Park	5,719	100%	5,719
55073	Scandia	4,169	86%	≈ 3,678
55082	Grant	36,277	100%	36,277
55090	Willernie	401	100%	401
55110	White Bear Lake	37,305	31%	≈ 3,809
55115	Mahtomedi	8,949	100%	8,949
55125	Woodbury	44,185	99.9%	≈ 44,176
55128	Oakdale	29,384	100%	29,384
55129	Woodbury	34,120	100%	34,120

ZIP codes shared with other counties

These 5 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.

55025 (Columbus): 39% here; 54% in Anoka County and 7.3% in Chisago County.
55033 (Hastings): 21% here; 75% in Dakota County and 3.4% in Goodhue County.
55038 (Hugo): 70% here; 30% in Anoka County.
55073 (Scandia): 86% here; 14% in Chisago County.
55110 (White Bear Lake): 31% here; 65% in Ramsey County and 4.0% in Anoka 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 Scandia (2), Woodbury (2), Afton (1), Bayport (1), Columbus (1), and Cottage Grove (1); 17 places in all.

They start with 2 different three-digit prefixes, one per USPS sorting center: 550 and 551.

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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