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County · code 55079

Milwaukee CountyWisconsin

Milwaukee County is a county in Wisconsin, established September 6, 1834, with its seat in Milwaukee.

  • Founded1834
  • County seatMilwaukee
  • Land area241 sq mi + 948 sq mi water
  • Population939,489 2020 Census
  • Parcels mapped280,670 checked 16 October 2026
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Updated

RacineOzaukeeWaukeshaWashingtonMuskegon, MIOttawa, MI Milwaukee Census outline · seat marked

Where it is

Milwaukee 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 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 CountyWashington CountyWaukesha CountyWaupaca CountyWaushara CountyWinnebago CountyWood CountyMilwaukee County Milwaukee
Counties of Wisconsin · Milwaukee highlighted

History

Formed in 1834 from Brown County and Iowa County

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

Milwaukee County was created by Michigan Territory from Brown and Iowa counties in present-day Wisconsin. Initially not fully organized, it was attached to Brown County for judicial purposes until September 7, 1835, when it was fully organized and detached from Brown. When Wisconsin Territory was created from Michigan Territory on July 3, 1836, Milwaukee became a county within the new territory, and later became a county in the state of Wisconsin on May 29, 1848.

Boundary changes from the Newberry Library, Atlas of Historical County Boundaries; the 5 that matter most are shown first.

  1. 1834
    Milwaukee County created Milwaukee created by Michigan Territory from Brown and Iowa; Milwaukee not fully organized, attached to Brown "for judicial purposes."
    from Brownfrom Iowa
    · Mich. Terr. Laws, 3:1325
  2. 1836
    Became part of Wisconsin Milwaukee became a county in Wisconsin Territory when Wisconsin Territory was created from Michigan Territory. · Terr. Papers U.S., 27:41-52; U.S. Stat., vol. 5, ch. 54 [1836]/pp. 10-16
  3. 1836
    Lost territory Milwaukee lost to creation of Dane, Dodge, Jefferson, Portage, Racine, Rock, Walworth, Washington, and Non-County Area 2. Dodge, Jefferson, and Washington not fully organized, attached to Milwaukee "for judicial purposes."
    to Daneto Dodgeto Jeffersonto Portageto Racineto Rockto Walworthto Washington
    · Wis. Terr. Laws 1836, no. 28, secs. 1-7, 13-14/pp. 92-94
  4. 1846
    Lost territory Milwaukee lost to creation of Waukesha.
    to Waukesha
    · History of Waukesha, 358-359; Milwaukee Sentinel, 9 Apr. 1846; Wis. Terr. Laws 1846, pp. 22-23
  5. 1848
    Became part of Wisconsin Milwaukee 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
Show all 10 changes (5 more)
  1. 1834
    Milwaukee County created Milwaukee created by Michigan Territory from Brown and Iowa; Milwaukee not fully organized, attached to Brown "for judicial purposes."
    from Brownfrom Iowa
    · Mich. Terr. Laws, 3:1325
  2. 1835
    Changed Milwaukee fully organized, detached from Brown.
    Brown
    · Mich. Terr. Laws, 4:136-137
  3. 1836
    Became part of Wisconsin Milwaukee became a county in Wisconsin Territory when Wisconsin Territory was created from Michigan Territory. · Terr. Papers U.S., 27:41-52; U.S. Stat., vol. 5, ch. 54 [1836]/pp. 10-16
  4. 1836
    Lost territory Milwaukee lost to creation of Dane, Dodge, Jefferson, Portage, Racine, Rock, Walworth, Washington, and Non-County Area 2. Dodge, Jefferson, and Washington not fully organized, attached to Milwaukee "for judicial purposes."
    to Daneto Dodgeto Jeffersonto Portageto Racineto Rockto Walworthto Washington
    · Wis. Terr. Laws 1836, no. 28, secs. 1-7, 13-14/pp. 92-94
  5. 1839
    Changed Jefferson fully organized, detached from Milwaukee.
    Jefferson
    · Wis. Terr. Laws 1838-1839, loc. acts, no. 35, sec. 1/p. 63
  6. 1840
    Changed Dodge detached from Milwaukee, attached to Jefferson "for judicial purposes."
    DodgeJefferson
    · Wis. Terr. Laws 1839-1840, no. 42, secs. 1, 5-6/pp. 50-51
  7. 1840
    Changed Washington organized "for county purposes;" Washington remained attached to Milwaukee "for all judicial purposes."
    Washington
    · Wis. Terr. Laws 1840, spec. sess., ch. 40, secs. 1-2/pp. 76-77
  8. 1845
    Changed Washington fully organized, detached from Milwaukee.
    Washington
    · Wis. Terr. Laws 1845, pp. 32-33
  9. 1846
    Lost territory Milwaukee lost to creation of Waukesha.
    to Waukesha
    · History of Waukesha, 358-359; Milwaukee Sentinel, 9 Apr. 1846; Wis. Terr. Laws 1846, pp. 22-23
  10. 1848
    Became part of Wisconsin Milwaukee 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

Land and parcels

What the maps cover in Milwaukee

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

Milwaukee by the Census

Population
939,489 2020 Census count
Housing units
424,191 2020 Census count
Land area
241 square miles
Water area
948 square miles · 80% of the county, including large bodies of water
People per sq mi
3,891 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

Milwaukee 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 Milwaukee County

When was Milwaukee County founded?
Milwaukee County was founded in 1834, formed from Brown County and Iowa County.
What is the county seat of Milwaukee County?
The county seat of Milwaukee County is Milwaukee.
Is there an online parcel map for Milwaukee County?
Yes. Milwaukee County publishes a parcel map of 280,670 parcels, rated good enough here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.
Has Milwaukee County's boundary or name changed?
Milwaukee County was created in 1834 from Brown County and Iowa County. Since then the Atlas of Historical County Boundaries records 9 later changes, chiefly involving Jefferson County, Washington County and Dodge County.
Is my lot in a flood zone?
We do not have flood maps for Milwaukee 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