Parcel Chartplaces Open the free map

County · code 17197

Will CountyIllinois

Will County is a county in Illinois with its county seat in Joliet, formed in 1836.

  • Founded1836
  • County seatJoliet
  • Named forConrad Will
  • Land area836 sq mi + 13 sq mi water
  • Population696,355 2020 Census
  • Parcels mapped282,293 checked 14 October 2026
Open the free map Click any parcel in Will County: acreage, parcel id, address and who publishes the map. No sign-in.

Updated

KankakeeDuPageKendallCookLake, IN Joliet Census outline · seat marked

Where it is

Will on the map of Illinois

Illinois has 102 counties and county equivalents, each with its own records office. Shapes with a page are links.

Adams CountyAlexander CountyBond CountyBoone CountyBrown CountyBureau CountyCalhoun CountyCarroll CountyCass CountyChampaign CountyChristian CountyClark CountyClay CountyClinton CountyColes CountyCook CountyCrawford CountyCumberland CountyDeKalb CountyDe Witt CountyDouglas CountyDuPage CountyEdgar CountyEdwards CountyEffingham CountyFayette CountyFord CountyFranklin CountyFulton CountyGallatin CountyGreene CountyGrundy CountyHamilton CountyHancock CountyHardin CountyHenderson CountyHenry CountyIroquois CountyJackson CountyJasper CountyJefferson CountyJersey CountyJo Daviess CountyJohnson CountyKane CountyKankakee CountyKendall CountyKnox CountyLake CountyLaSalle CountyLawrence CountyLee CountyLivingston CountyLogan CountyMcDonough CountyMcHenry CountyMcLean CountyMacon CountyMacoupin CountyMadison CountyMarion CountyMarshall CountyMason CountyMassac CountyMenard CountyMercer CountyMonroe CountyMontgomery CountyMorgan CountyMoultrie CountyOgle CountyPeoria CountyPerry CountyPiatt CountyPike CountyPope CountyPulaski CountyPutnam CountyRandolph CountyRichland CountyRock Island CountySt. Clair CountySaline CountySangamon CountySchuyler CountyScott CountyShelby CountyStark CountyStephenson CountyTazewell CountyUnion CountyVermilion CountyWabash CountyWarren CountyWashington CountyWayne CountyWhite CountyWhiteside CountyWilliamson CountyWinnebago CountyWoodford CountyWill County Will
Counties of Illinois · Will highlighted

History

Formed in 1836 from Cook County, Iroquois County and Vermilion County

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

Will County was created on January 12, 1836, from Cook, Iroquois, and Vermilion counties. The county was named after Conrad Will. In 1853, Will County lost territory to the creation of Kankakee County.

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

  1. 1836
    Will County created Will created from Cook, Iroquois, Non-County Area 9, and Non-County Area 4 attached to Vermilion.
    from Cookfrom Iroquoisfrom Vermilion
    · Ill. Laws 1835-1836, pp. 262-263
  2. 1839
    Changed In August 1839, the legislature authorized Du Page to gain the northern halves of township 37 north, ranges 9 and 10 east, from Will, dependent on local referendum that failed (no change).
    Du Page
    · History of Will, 358-359; Ill. Laws 1838-1839, pp. 73-74
  3. 1851
    Changed Legislature authorized creation of Kankakee from Will and Iroquois, dependent on local referendum that failed.
    KankakeeIroquois
    · Ill. Laws 1851, gen., pp. 30-35
  4. 1853
    Lost territory Will lost to creation of Kankakee.
    to Kankakee
    · Ill. Laws 1853, gen., pp. 159-163

Land and parcels

What the maps cover in Will

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

Will by the Census

Population
696,355 2020 Census count
Housing units
250,678 2020 Census count
Land area
836 square miles
Water area
13 square miles
People per sq mi
833 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.

Permits

Zoning and code

County government

See your own lot on these maps

Open Will 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.

Open the free map no sign-in Pro early access

Questions

Common questions about Will County

When was Will County founded?
Will County was founded in 1836, formed from Cook County, Iroquois County and Vermilion County, and named after Conrad Will.
What is the county seat of Will County?
The county seat of Will County is Joliet.
Is there an online parcel map for Will County?
Yes. Will County publishes a parcel map of 282,293 parcels, rated good enough here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.
Has Will County's boundary or name changed?
Will County was created in 1836 from Cook County, Iroquois County and Vermilion County. Since then the Atlas of Historical County Boundaries records 1 later change, chiefly involving Kankakee County.
Who issues building permits in Will County?
The county's page on building permits: Apply and View Permits Online. Inside a city or town, ask that city first.
Is my lot in a flood zone?
We do not have flood maps for Will 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