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County · code 17063

Grundy CountyIllinois

Grundy County is a county in Illinois with its seat in Morris. It was formed on February 17, 1841, from La Salle County.

  • Founded1841
  • County seatMorris
  • Named forFelix Grundy
  • Land area418 sq mi + 12 sq mi water
  • Population52,533 2020 Census
  • Parcels mapped27,032 checked 16 October 2026
Open the free map Click any parcel in Grundy County: acreage, parcel id, address and who publishes the map. No sign-in.

Updated

KendallLivingstonLaSalleKankakee Morris Census outline · seat marked

Where it is

Grundy 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 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 CountyWill CountyWilliamson CountyWinnebago CountyWoodford CountyGrundy County Grundy
Counties of Illinois · Grundy highlighted

History

Formed in 1841 from La Salle County

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

Grundy County was created from La Salle County in 1841 and named after Felix Grundy.

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

  1. 1841
    Grundy County created Grundy created from La Salle.
    from La Salle
    · Ill. Laws 1840-1841, pp. 74-75

Land and parcels

What the maps cover in Grundy

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

Grundy by the Census

Population
52,533 2020 Census count
Housing units
21,174 2020 Census count
Land area
418 square miles
Water area
12 square miles
People per sq mi
126 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.

Zoning and code

County government

See your own lot on these maps

Open Grundy 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 Grundy County

When was Grundy County founded?
Grundy County was founded in 1841, formed from La Salle County, and named after Felix Grundy.
What is the county seat of Grundy County?
The county seat of Grundy County is Morris.
Is there an online parcel map for Grundy County?
Yes. Grundy County publishes a parcel map of 27,032 parcels, rated good enough here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.
Has Grundy County's boundary or name changed?
Grundy County was created in 1841 from La Salle 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 Grundy 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