Every ZIP code in the United States, with weather, radar, trivia and the numbers behind it. Five digits since 1963!

ZIP stands for Zone Improvement Plan. The codes went live on July 1, 1963.The lowest ZIP code is 00501 — the IRS in Holtsville, New York.The highest ZIP code is 99950, in Ketchikan, Alaska.Type 07734 into a calculator and turn it upside down: hELLO. It is Keansburg, New Jersey.12345 belongs to one company: General Electric in Schenectady, New York.The first digit is a region: 0 is New England and New Jersey, 9 is the West Coast, Alaska and Hawaii.Mr. ZIP, the cartoon mailman, was the mascot that sold the idea to America.ZIP+4 arrived in 1983 and can narrow a ZIP down to one side of one block.A ZIP code is a mail route, not a place: plenty of them cross county and even state lines.Play ZIP Hunt: guess the secret ZIP code of the day in six tries.
zipcodes.pro — STATE/MN/COUNTY/WASHINGTON

Washington County, MN ZIP codes

There are 17 ZIP codes in Washington County, MN, in 13 towns, from 55001 to 55129. The largest are 55125 (Saint Paul), 55016 (Cottage Grove) and 55082 (Stillwater). 2 more cross into it from neighbouring counties: 55033 and 55025.

The county seat is Stillwater.

ZIP codes
17
Partly in it
2 more
Towns
13
County seat
Stillwater
County FIPS
27163
Population
276,238
Median household income
$115,345
Land area
385 sq mi
Area code
651

Washington County ZIP codes by town

Stillwater (county seat)
55082, 55083

Each ZIP code is listed under the county most of its land lies in and the town the Postal Service names it for; a ZIP code's own page shows exactly how it is split.

ZIP codes partly in Washington County

These ZIP codes lie mostly in a neighbouring county but each cover a twentieth or more of Washington County.

Map of Washington County ZIP codes

5500155003550165503855042550435504755055550715507355082550835509055115551255512855129

The ZIP codes of Washington County, shaded. Outlines are Census ZIP Code Tabulation Areas (2020), which approximate the mail routes; PO-box and single-address codes have no area and are not drawn. Click any area to open its ZIP code.

Washington County in numbers

About 276,238 people live in Washington County, in 105,577 households, the 5th most populous of Minnesota's 87 counties. The median household income is $115,345 a year, 30% above the Minnesota median of $89,062 (US: $80,734). The median owner-occupied home is valued at $422,000 (28% above the Minnesota median), and median gross rent is $1,710 a month. The median age is 39.8; 49.1% of adults 25 and over hold a bachelor's degree or higher (39.4% across Minnesota); the average commute takes 24 minutes.

Population276,238Washington276,238
Households105,577Washington105,577
Median age39.8Washington39.8Minnesota38.8US 38.9
Median household income$115,345Washington$115,345Minnesota$89,062US $80,734
Median home value$422,000Washington$422,000Minnesota$329,300US $332,700
Median gross rent$1,710Washington$1,710Minnesota$1,280US $1,413
Bachelor's degree or higher49.1%Washington49.1%Minnesota39.4%US 35.7%
Mean commute24.0 minWashington24.0 minMinnesota22.7 minUS 26.4 min
Population density718 / sq miWashington718 / sq mi

U.S. Census Bureau, American Community Survey 2020–2024 5-year estimates. Survey estimates carry margins of error, wider for small places. Sources and methods.

Largest towns in Washington County

Largest towns in Washington County
TownZIP codesPopulation
St. Paul 4 307,284
Cottage Grove 1 40,992
Stillwater 2 19,355
Hugo 1 16,340
Lake Elmo 1 13,140
St. Paul Park 1 5,457
Newport 1 4,754
Scandia 1 3,950
Bayport 1 3,905
Afton 1 2,957
Lakeland 1 1,492
Marine on St. Croix 1 740
Willernie 1 495

Population of the census place of that name where there is one, otherwise of the ZIP codes the Postal Service addresses by it. A town's ZIP codes can reach past the county line.

Neighbouring counties

Counties that share a ZIP code with Washington County.

Not sure you are in Washington County? What county am I in? answers from your location, near a county line included.

Every ZIP code in Washington County, with figures

ZIP codes in Washington County
ZIP City Type Population Median income Median home
55001 Afton , MN Standard 3,027 $133,581 $673,900
55003 Bayport , MN Standard 3,905 $125,893 $376,900
55016 Cottage Grove , MN Standard 40,695 $120,715 $377,700
55038 Hugo , MN Standard 25,061 $130,931 $422,800
55042 Lake Elmo , MN Standard 13,705 $154,341 $602,100
55043 Lakeland , MN Standard 3,424 $102,966 $383,500
55047 Marine On Saint Croix , MN Standard 2,244 $107,361 $497,900
55055 Newport , MN Standard 4,754 $71,979 $378,100
55071 Saint Paul Park , MN Standard 5,719 $100,798 $267,500
55073 Scandia , MN Standard 4,169 $128,723 $462,400
55082 Stillwater , MN Standard 36,277 $115,040 $474,400
55083 Stillwater , MN No street area — — —
55090 Willernie , MN Standard 401 $85,119 $330,600
55115 Saint Paul , MN Standard 8,949 $124,234 $488,400
55125 Saint Paul , MN Standard 44,185 $119,260 $416,100
55128 Saint Paul , MN Standard 29,384 $93,210 $312,800
55129 Saint Paul , MN Standard 34,120 $143,795 $534,900

Cite this page

zipcodes.pro. “Washington County ZIP codes.” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/state/mn/county/washington

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