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County · code 55127

Walworth CountyWisconsin

Walworth County is a county in Wisconsin with its seat in Elkhorn. It was created on December 7, 1836, from parts of Milwaukee and Racine counties.

  • Founded1836
  • County seatElkhorn
  • Named forReuben H. Walworth
  • Land area555 sq mi + 21 sq mi water
  • Population106,478 2020 Census
  • Parcels mapped70,682 checked 14 October 2026
Open the free map Click any parcel in Walworth County: acreage, parcel id, address and who publishes the map. No sign-in.

Updated

McHenry, ILJeffersonBoone, ILRockRacine Elkhorn Census outline · seat marked

Where it is

Walworth 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 CountyWashburn CountyWashington CountyWaukesha CountyWaupaca CountyWaushara CountyWinnebago CountyWood CountyWalworth County Walworth
Counties of Wisconsin · Walworth highlighted

History

Formed in 1836 from Milwaukee County and Racine County

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

Walworth County was created by Wisconsin Territory from Milwaukee and Racine counties but was not fully organized at first, so it was attached to Racine County for judicial purposes. The county was fully organized and detached from Racine in 1839, and became a county in the state of Wisconsin in 1848. Walworth County was named after Reuben H. Walworth.

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

  1. 1836
    Walworth County created Walworth created by Wisconsin Territory from Milwaukee; Walworth not fully organized, attached to Racine "for judicial purposes."
    from Milwaukeefrom Racine
    · Wis. Terr. Laws 1836, no. 28, secs. 1-2/p. 92
  2. 1839
    Changed Walworth fully organized, detached from Racine.
    Racine
    · Wis. Terr. Laws 1837, no. 62, secs. 1-2/p. 368; Wis. Terr. Laws 1838-1839, loc. acts, no. 1, sec. 2/p. 3
  3. 1848
    Became part of Wisconsin Walworth 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 Walworth

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

Walworth by the Census

Population
106,478 2020 Census count
Housing units
53,146 2020 Census count
Land area
555 square miles
Water area
21 square miles
People per sq mi
192 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

Who to ask before you build, dig or sell

Official county pages only. We link to them; we do not copy them, because they change.

Inside a city or town, permits usually come from that city rather than the county.

Records

Permits

Zoning and code

County government

See your own lot on these maps

Open Walworth 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 Walworth County

When was Walworth County founded?
Walworth County was founded in 1836, formed from Milwaukee County and Racine County, and named after Reuben H. Walworth.
What is the county seat of Walworth County?
The county seat of Walworth County is Elkhorn.
Is there an online parcel map for Walworth County?
Yes. A public source publishes a parcel map of 70,682 parcels, rated good enough here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.
Has Walworth County's boundary or name changed?
Walworth County was created in 1836 from Milwaukee County and Racine County. Since then the Atlas of Historical County Boundaries records 2 later changes, chiefly involving Racine County.
Who issues building permits in Walworth County?
The county's page on building permits: Permits & Fees. Inside a city or town, ask that city first.
Who issues septic and well permits in Walworth County?
The county's page on septic systems and wells: Division of Public Health.
Is my lot in a flood zone?
We do not have flood maps for Walworth 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