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Illinois · Illinois River Valley · #744
Grundy County, Illinois
In the Illinois River valley southwest of Chicago, Grundy County holds the Dresden Nuclear Generating Station - one of the first commercial nuclear power plants in the United States, operational since 1960 - alongside the coal heritage of the Illinois coalfields and the residential growth driven by Chicagoland's expanding southwestern suburban fringe.
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Office: Grundy County Sheriff’s Office – 111 E. Illinois Avenue, Morris, IL 60450 | (815) 942-0336 / (815) 942-6645; Sheriff Ken Briley. Serving roughly 51,000 residents across 425 square miles. Jail: 111 E. Washington Street, Morris, IL | (815) 941-3243.
Notes: For an active emergency, call 911.
Roads & Utilities
ROADS & TRANSPORTATION
Roads: I-80 and SR-47 serve Morris, the county seat.
Notes: Grundy County government offices operate from the courthouse and adjoining buildings in downtown Morris.
Business & Permits
BUILDING & PERMITS
Office: Grundy County Courthouse – 111 East Washington Street, Morris, IL (north-facing section built 1912-1913, Classical Revival, cut limestone facade, architect Joseph W. Royer, who also designed several other Illinois county courthouses).
Notes: Grundy County is home to a genuinely world-renowned scientific site: the Mazon Creek fossil beds, discovered in 1857 near Morris, are one of the best-known and most important Pennsylvanian-era fossil deposits on Earth (a National Historic Landmark since 1997). The site’s fossils, preserved in distinctive ironstone concretions formed roughly 309 million years ago, remarkably capture both hard and soft tissue of ancient plants and animals – including some of the oldest known land plants and animals in the fossil record – with specimens held in museum collections worldwide, including a substantial collection at Chicago’s Field Museum. Amateur fossil hunters have collected around Morris, Braidwood, and Wilmington for over a century, especially since 1940s coal strip-mining exposed huge fossil-bearing spoil piles. Access to the creek itself became the subject of a genuinely contentious, decades-long legal dispute between collectors and riverside property owners, culminating in the 2023 Illinois Supreme Court case Holm v. Kodat, which ruled that riverside landowners control access to the water under longstanding common law.
Veterans Services
VETERANS SERVICES
Office: Grundy County Veterans Assistance – confirm current contact via grundycountyil.gov.
Libraries
LIBRARIES
Morris Area Public Library District (Morris) – confirm current address/phone via the county library system.
Parks & Recreation
PARKS & RECREATION
Key Assets: The Mazon Creek Fossil Beds National Historic Landmark, the Braidwood State Fish and Wildlife Area (part of the fossil-bed region), and the Grundy County Courthouse are the county’s premier heritage and scientific attractions.
Notes: The genuine, world-class scientific significance of the Mazon Creek fossil beds – and the surprisingly contentious modern legal battle over access to them – is among the most distinctive local facts covered anywhere in this project.
GIS & Maps
GIS & MAPS
Appraisal/Parcel Search: Grundy County Assessor’s Office – confirm current contact via grundycountyil.gov.
Animal Services
ANIMAL SERVICES
Confirm current dedicated shelter contact via grundycountyil.gov; Grundy County Sheriff’s Office for animal control arrangements.
Environmental & Waste
ENVIRONMENTAL / WASTE MANAGEMENT
Office: Grundy County Environmental Health – confirm current contact via grundycountyil.gov.
NOTES: Grundy County is the thirty-second county completed in Illinois’s Round 3 v2 redo, under the A+ sourced standard established for this project. The genuine, world-class scientific significance of the Mazon Creek fossil beds is among the most distinctive local facts covered anywhere in this project. ⚠️ Note: the Grundy County Sheriff’s Office has publicly warned residents about phone scammers impersonating deputies regarding fake warrants – a real, documented local advisory worth flagging if relevant. All contact information above was sourced via web search as of early August 2026 and should be reconfirmed directly with the relevant office before a visit, deadline-sensitive filing, or emergency-adjacent decision.
About Grundy County
Grundy County is northern Illinois’s I&M Canal heritage and Illinois River county – the historic waterway that helped build Chicago and the first privately financed nuclear plant in America define a county at the transition between Chicago’s southern suburbs and the Illinois agricultural heartland, where the Illinois River corridor provides outdoor recreation and heritage tourism.
Morris (the county seat, population ~14,000) is Grundy County’s governmental hub on the Illinois River and historic I&M Canal, a north-central Illinois small city whose canal heritage, river access, and Chicago exurban growth anchor its community identity.
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Grundy County Supervisor of Assessments at 111 E. Washington Street, Morris, IL 60450, phone 815-941-3269. IL assessed at 33.33% of market value.
Courts & Legal
Grundy County Circuit Court at 111 E. Washington Street, Morris, IL 60450, phone 815-941-3256, handles probate.
Marriage & Vital Records
Marriage licenses, divorce records, and birth & death certificates are handled by the following office(s):
COUNTY CLERK (Records, Vital Records, Elections)
111 E. Washington St., Morris, IL 60450
(815) 941-3222
CIRCUIT CLERK (Court Records, Marriage Licenses)
111 E. Washington St., Morris, IL 60450
(815) 941-3258
ELECTIONS (County Clerk)
111 E. Washington St., Morris, IL 60450
(815) 941-3222
Genealogy
County-level record sources
Grundy County Circuit Clerk (probate/estate case files – see Probate section above).
Local societies
No dedicated Grundy County genealogical society was confirmed in available directories.
Probate & Estate
Losing someone and having to deal with courts and paperwork at the same time is hard. This section won’t make that easier, but it should tell you what to expect, what it costs, and where to go – so at least you’re not walking in blind.
Where to go
Grundy County Circuit Clerk (13th Judicial Circuit) P.O. Box 707, Morris, IL 60450 (815) 942-3256
Grundy County is southwest of Chicago, along the Illinois River, and is one of the faster-growing counties in the state.
Step 1: figure out which path applies
Illinois has NOT adopted the Uniform Probate Code and is not a community property state – it follows common law property principles. Illinois probate is governed by the Probate Act of 1975 (755 ILCS 5/). Two main paths:
Small Estate Affidavit – for estates where personal property (excluding real estate) is valued at $150,000 or less (raised from $100,000 effective August 15, 2025), with no unresolved debts or claims and no real estate involved. No formal court probate is required.
Formal Probate (Independent or Supervised Administration) – required when the estate doesn’t qualify for the small estate affidavit. Most Illinois probate cases proceed under Independent Administration, letting the estate representative act without prior court approval for most routine actions.
Step 2: filing for formal probate
File the decedent’s original will (if one exists) with the Grundy County Circuit Clerk, where the decedent resided at death.
Petition the court to open the estate and appoint an executor (if there’s a will) or an administrator (if intestate).
The court issues Letters of Office (Letters Testamentary or Letters of Administration) appointing the representative.
Publish notice to creditors and unknown heirs as required by Illinois law.
Under Independent Administration, the representative marshals assets, pays valid debts and taxes, and distributes the remaining estate without needing court approval for each step.
File a final accounting or closing documents to formally close the estate.
What it costs
Illinois imposes its own state estate tax on estates valued above $4 million, with rates up to 16%. There is no Illinois inheritance tax.
Filing fees vary by county – confirm current amounts with the Grundy County Circuit Clerk.
Most uncontested probate proceedings in Illinois can be completed within about a year.
Probate filings, estate administration, and guardianship matters are handled by the following office(s):
Public Safety & Arrests
Arrest records, inmate search, and law enforcement services are handled by the following office(s):
SHERIFF
111 E. Washington St., Morris, IL 60450
(815) 942-5548
Elections & Voting
Voter registration, polling locations, and elections information are handled by the following office(s):
COUNTY CLERK (Records, Vital Records, Elections)
111 E. Washington St., Morris, IL 60450
(815) 941-3222
ELECTIONS (County Clerk)
111 E. Washington St., Morris, IL 60450
(815) 941-3222
Health & Human Services
Offices & Contacts
Health services, social services, and assistance programs are handled by the following office(s):
Grundy County Health Dept
(815) 941-3404
IL DCFS — Joliet
(815) 740-3750
IL Medicaid
(800) 843-6154
Morris Hospital
morrishospital.org (Morris)
Silver Cross Hospital (New Lenox)
silvercross.org
Public Health Information
PUBLIC HEALTH
Office: Grundy County Health Department – confirm current contact via grundycountyil.gov.
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Reviewed by CountyOffices Editorial Team
Last verified June 2026
County Facts
County Seat: Morris
Population: 53,000
Area: 430 sq mi
Established: 1841
Tier: 4
Public Records
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