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County · code 55131

Washington CountyWisconsin

Washington County is in Wisconsin, with its county seat in West Bend. It was created in 1836 from parts of Brown and Milwaukee counties and named after George Washington.

  • Founded1836
  • County seatWest Bend
  • Named forGeorge Washington
  • Land area431 sq mi + 5 sq mi water
  • Population136,761 2020 Census
  • Parcels mapped65,174 checked 16 October 2026
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Updated

WaukeshaFond du LacDodgeOzaukee West Bend Census outline · seat marked

Where it is

Washington on the map of Wisconsin

Wisconsin has 72 counties and county equivalents, each with its own records office. Shapes with a page are links.

Adams CountyAshland CountyBarron CountyBayfield CountyBrown CountyBuffalo CountyBurnett CountyCalumet CountyChippewa CountyClark CountyColumbia CountyCrawford CountyDane CountyDodge CountyDoor CountyDouglas CountyDunn CountyEau Claire CountyFlorence CountyFond du Lac CountyForest CountyGrant CountyGreen CountyGreen Lake CountyIowa CountyIron CountyJackson CountyJefferson CountyJuneau CountyKenosha CountyKewaunee CountyLa Crosse CountyLafayette CountyLanglade CountyLincoln CountyManitowoc CountyMarathon CountyMarinette CountyMarquette CountyMenominee CountyMilwaukee CountyMonroe CountyOconto CountyOneida CountyOutagamie CountyOzaukee CountyPepin CountyPierce CountyPolk CountyPortage CountyPrice CountyRacine CountyRichland CountyRock CountyRusk CountySt. Croix CountySauk CountySawyer CountyShawano CountySheboygan CountyTaylor CountyTrempealeau CountyVernon CountyVilas CountyWalworth CountyWashburn CountyWaukesha CountyWaupaca CountyWaushara CountyWinnebago CountyWood CountyWashington County Washington
Counties of Wisconsin · Washington highlighted

History

Formed in 1836 from Brown County and Milwaukee County

An old deed may name a county that no longer exists, or a boundary that has since moved.

Washington County was created by Wisconsin Territory on December 7, 1836, from Brown and Milwaukee counties, but was not fully organized and remained attached to Milwaukee for judicial purposes. In 1840, Washington was organized for county purposes while still remaining attached to Milwaukee for judicial matters, and in 1845 it became fully organized and detached from Milwaukee. In 1853, the county lost territory when Ozaukee County was created from it.

Boundary changes from the Newberry Library, Atlas of Historical County Boundaries.

  1. 1836
    Washington County created Washington created by Wisconsin Territory from Brown and Milwaukee; Washington not fully organized, attached to Milwaukee "for judicial purposes."
    from Brownfrom Milwaukee
    · Wis. Terr. Laws 1836, no. 28, secs. 7, 14/pp. 93-94
  2. 1840
    Changed Washington organized "for county purposes;" Washington remained attached to Milwaukee "for all judicial purposes."
    Milwaukee
    · Wis. Terr. Laws 1840, spec. sess., ch. 40, secs. 1-2/pp. 76-77
  3. 1845
    Changed Washington fully organized, detached from Milwaukee.
    Milwaukee
    · Wis. Terr. Laws 1845, pp. 32-33
  4. 1848
    Became part of Wisconsin Washington became a county in the state of Wisconsin. · U.S. Stat., vol. 9, ch. 89 [1846]/pp. 56-58, and ch. 50 [1848]/pp. 233-235; Van Zandt, 128, 130
  5. 1850
    Changed Legislature authorized creation of Tuskola (proposed) from Washington, dependent on local referendum that failed (no change).
    Tuskola
    · Kellogg, "Organization," 193; Wis. Laws 1850, ch. 114, secs. 4-5, 14-15/pp. 75-78
  6. 1853
    Lost territory Washington lost to creation of Ozaukee.
    to Ozaukee
    · Wis. Laws 1853, gen., ch. 21, secs. 1-2/pp. 18-21

Land and parcels

What the maps cover in Washington

Who publishes each layer, how good it is, and when we last checked.

Official
from the office that keeps the record
Good enough
a reliable statewide or national copy
Fallback
a guide only; check the official record
Missing
nothing public found yet

People and land

Washington by the Census

Population
136,761 2020 Census count
Housing units
58,311 2020 Census count
Land area
431 square miles
Water area
5 square miles
People per sq mi
318 population ÷ land area

Source: US Census Bureau, 2020 Census; US Census Bureau, 2020 Gazetteer Files. Not endorsed or certified by the Census Bureau.

Rules and offices

Washington County's official site

We have found the county's site but not its offices yet; start there.

County government

See your own lot on these maps

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Questions

Common questions about Washington County

When was Washington County founded?
Washington County was founded in 1836, formed from Brown County and Milwaukee County, and named after George Washington.
What is the county seat of Washington County?
The county seat of Washington County is West Bend.
Is there an online parcel map for Washington County?
Yes. A public source publishes a parcel map of 65,174 parcels, rated good enough here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.
Has Washington County's boundary or name changed?
Washington County was created in 1836 from Brown County and Milwaukee County. Since then the Atlas of Historical County Boundaries records 4 later changes, chiefly involving Milwaukee County and Ozaukee County.
Is my lot in a flood zone?
We do not have flood maps for Washington County yet. Look up the address on FEMA's Flood Map Service Center, which shows the effective flood map for any lot.

Nearby

Counties next door