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County · code 55089

Ozaukee CountyWisconsin

Ozaukee County is a county in Wisconsin with its county seat in Port Washington. The county was created on March 7, 1853, from Washington County and named after the Sauk people.

  • Founded1853
  • County seatPort Washington
  • Named forSauk people
  • Land area233 sq mi + 883 sq mi water
  • Population91,503 2020 Census
  • Parcels mapped41,357 checked 14 October 2026
Open the free map Click any parcel in Ozaukee County: acreage, parcel id, address and who publishes the map. No sign-in.

Updated

MilwaukeeSheboyganWashingtonWaukeshaOceana, MIMuskegon, MI Port Washington Census outline · seat marked

Where it is

Ozaukee 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 CountyPepin CountyPierce CountyPolk CountyPortage CountyPrice CountyRacine CountyRichland CountyRock CountyRusk CountySt. Croix CountySauk CountySawyer CountyShawano CountySheboygan CountyTaylor CountyTrempealeau CountyVernon CountyVilas CountyWalworth CountyWashburn CountyWashington CountyWaukesha CountyWaupaca CountyWaushara CountyWinnebago CountyWood CountyOzaukee County Ozaukee
Counties of Wisconsin · Ozaukee highlighted

History

Formed in 1853 from Washington County

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

Ozaukee County was created from Washington County on March 7, 1853.

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

  1. 1853
    Ozaukee County created Ozaukee created from Washington.
    from Washington
    · Wis. Laws 1853, gen., ch. 21, secs. 1-2/pp. 18-21

Land and parcels

What the maps cover in Ozaukee

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

Ozaukee by the Census

Population
91,503 2020 Census count
Housing units
39,086 2020 Census count
Land area
233 square miles
Water area
883 square miles · 79% of the county, including large bodies of water
People per sq mi
393 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

Ozaukee 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

Open Ozaukee County on Parcel Chart's free map and click your parcel. Save it with a free account; the full record of your place (site map, projects, documents) is Pro, in early access.

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Questions

Common questions about Ozaukee County

When was Ozaukee County founded?
Ozaukee County was founded in 1853, formed from Washington County, and named after Sauk people.
What is the county seat of Ozaukee County?
The county seat of Ozaukee County is Port Washington.
Is there an online parcel map for Ozaukee County?
Yes. Ozaukee County publishes a parcel map of 41,357 parcels, rated good enough here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.
Has Ozaukee County's boundary or name changed?
Ozaukee County was created in 1853 from Washington County. The Atlas of Historical County Boundaries records no boundary change since.
Is my lot in a flood zone?
We do not have flood maps for Ozaukee 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