How to Search Cook County Public Records
Cook County is the most populous county in Illinois (5.18M residents) and the second most populous in the U.S. — covering Chicago and 134 suburbs across 946 sq mi.
- Court cases: Clerk of the Circuit Court — cookcountyclerkofcourt.org/online-case-information — civil, criminal, family, probate, traffic.
- Jail / inmate: Cook County Sheriff — iic.ccsheriff.org — current Cook County Jail custody.
- Vital records: Cook County Clerk — cookcountyclerkil.gov — birth, death, marriage certificates.
- Property: Assessor (cookcountyassessoril.gov) parcels; Treasurer/Tax Portal (cookcountypropertyinfo.com) tax bills; Clerk (cookcountyclerkil.gov/recordings) deeds.
- Statewide courts: Illinois courts portal — illinoiscourts.gov — Appellate and Supreme Court rulings.
Population
5.18M
Cities/Villages
135
Square Miles
946
Founded
1831
Departments
60+
Searching Cook County: what to expect
Cook County does more online than most: 5 county-run sources below, which keeps courthouse trips to a minimum. The county docket is online at casesearch.cookcountyclerkofcourt.org — one of the more useful local sources, since Illinois has no single statewide court search. Two local sources do most of the work — cookcountyil.gov for local vital-records requests, cookcountyassessoril.gov for parcel and property-tax data. The county posts nothing for criminal records, so that search runs through the statewide sources on our Illinois criminal records page.
SearchSystems Editorial
Edited by SearchSystems Editorial Team — verified against official government sources. About our editorial process.
Last reviewed: June 04, 2026 · Methodology: all Cook County record-source URLs verified against the official local and Illinois state publishers on the review date. 3 primary .gov / official sources cited below.
Cook County — Key Numbers (2026)
Population, demographics, and county-seat data for Cook County, Illinois — verified against U.S. Census 2024 estimates.
5,182,617
Population
Census estimate
2,066,248
Households
Census estimate
$78,304
Median income
Annual household
$293,700
Median home value
Census ACS
Chicago
County seat
In Illinois
Criminal records
1 source
Court records
4 sources
Wants & warrants
see state portal
Property records
2 sources
Vital records
1 source
Voter records
see state portal
Professional licenses
see state portal
Recorded documents
see state portal
Count of verified official sources per record type. Multiple sources One source Use state portal
Cook County Records at a Glance
| Record type | Cook County verified sources |
|---|---|
| Court records | https://casesearch.cookcountyclerkofcourt.org/Dock... | Clerk of the Circuit Court of Cook County |
| Criminal records | Detainee Discharge Tracker - Individual in Custody Locator |
| Wants & warrants | |
| Property records | We are Here to Help | Cook County Assessor's Office Recording Terms and Topics - Cook County Clerk |
| Vital records | Vital Records | Cook County |
| Voter records | Illinois Online Voter Registration Application: Registration Lookup |
| Professional licenses | IDFPR Online Services Portal |
| Recorded documents | Illinois State Board of Elections Voter Registration in Cook County. Cook County Government, Illinois | Cook County |
Count of officially verified .gov / .us record sources cataloged for Cook County. Sources reviewed June 04, 2026.
What Changed in 2026 — Cook County Records
2026
Cook County official government portal active
The official Cook County government website at www.cookcountyil.gov continues to serve as the canonical local source.
2026
Cook County court records portal verified
State court system links for Cook County verified against the Illinois judiciary portal in 2026.
2026
Cook County criminal records access
State criminal records repository for Cook County (statewide system, not county-specific) confirmed active in 2026.
2026
Cook County property records online
Cook County property assessment and recorder office online portal active in 2026.
The 4-Step Cook County Records Pathway
1
Step 1 — Start at the Cook County clerk/courthouse
For most local records (court cases, property deeds, marriage licenses), the Cook County clerk's office is the first stop.
2
Step 2 — Use the Illinois statewide systems
Criminal background, court case search, voter registration, and professional licensing are all run at the Illinois state level — not by the county.
3
Step 3 — Federal sources for federal records
Federal court cases (PACER), federal tax liens (IRS), military records (NPRC), and immigration data (ICE) are all federal — not held by the county.
4
Step 4 — Cross-check before relying on data
Most county portals lag 24-48 hours behind the courthouse. For time-sensitive verification, call the clerk directly.
Five Things People Get Wrong About Cook County Records
MYTH"Cook County maintains all criminal records."
FACTCriminal records for Cook County are held by the Illinois state repository, NOT the county. The county sheriff has only the local arrest log.
MYTH"Records sealed in Cook County are gone everywhere."
FACTSealing removes records from public search but they still exist at the courthouse and may appear in FBI records (Identity History Summary).
MYTH"Free 'instant background' sites have Cook County data."
FACTOnly the official Illinois state repository has verified, current Cook County data. Free sites often have stale data.
MYTH"The Cook County assessor's value is what I'll sell my home for."
FACTThe Cook County assessor's value is for property tax purposes only — usually below market value.
MYTH"All county records older than 50 years are public."
FACTPartially false. Public-records rules vary by record type AND state. Court records and deeds are usually older-public; vital records remain restricted longer (often 75-125 years).
Primary Sources and Official Record Portals
- www.cookcountyil.gov — Official Cook County government website
- www.cookcountyassessoril.gov — Property records — official source
- fbi.gov — FBI Identity History Summary (federal record)
Related — Cook County & Illinois Records
For records not specific to Cook County, use Illinois's statewide system or the national hub.
📍 Illinois statewide record systems:
- Illinois Court Records →
- Illinois Criminal Records →
- Illinois Property Records →
- Illinois Vital Records →
- Illinois Voter Records →
- Illinois Wants & Warrants →
- Illinois Licenses →
- Illinois Recorded Documents →
🇺🇸 National hubs:
Related Public Records
Illinois statewide records: Court records · Criminal records · Wants & warrants · Property records · Vital records · Voter records · Licenses · Recorded docs
National directories: Court records · Criminal records · Property records · Vital records · Federal databases
Most Cook County searches end up needing one of these:
About Cook County, Illinois
Cook County is located in northeast Illinois. The county seat is Chicago (official site: http://www.cookcountyil.gov/).
- Households: 2,066,248
- Median household income: $78,304
- Median home value: $293,700
- Below poverty line: 13.4%
- Population density: 5,484.7 people / sq mi
- Public libraries indexed: 192
- NCES schools indexed: 1,295
https://casesearch.cookcountyclerkofcourt.org/Dock...
Official Free
The Clerk of the Circuit Court offers this online access to full electronic docket cases filed in the Civil, Law, Chancery, and Domestic Relations divisions .
Clerk of the Circuit Court of Cook County
Official Free
For various reasons, the US Postal Child Support checks issued and mailed by the Clerks Office. For example, the recipient moved without properly notifying the Clerks Office of her/his new mailing address. Use this Search to determine if the Clerks Office may be holding unclaimed Child Support
Online Case Search | Clerk of the Circuit Court of Cook County
Official Free
Search the full electronic docket for cases filed in the Civil, Law, Chancery, and Domestic Relations/Child Support divisions. Start Search · Search records for cases filed in Probate Court related to claims against estates and guardianships.
Cook County Court - Probate Wills
Official Free
For your convenience, the Clerk of the Circuit Court offers on-line access to electronic docket information for cases in the Criminal divisions.
State of Illinois Office of the Illinois Courts
Official Free
The Office of the Illinois Courts provides information about the Illinois court system, including Circuit Courts, Appellate Courts, and the Supreme Court.
Illinois Online Voter Registration Application: Registration Lookup
Official Free
Voter and election business for Cook County is managed here. It is an official government source.
Detainee Discharge Tracker - Individual in Custody Locator
Official Free
This office holds the sheriff's records for Cook County. It is independently run, so verify anything critical against the official criminal record office.
VINE is not working right now - VINELink
Official Free
Law-enforcement records for Cook County route through this office. If a link breaks, start from vinelink.vineapps.com directly.
Vital Records | Cook County
Official Free
The Clerk's office registers business with Illinois law. An assume… The Cook County Clerk's office keeps official records of births that occur in Chicago and suburban Cook County
Birth, Death, Other Records - Illinois Department of Public Health
Official Free
Certified copies are available from the circuit court clerk in the county where the dissolution of civil union was granted. To learn more, see RESOURCES in the right-hand column and click on List of Circuit Court Clerks. The Division of Vital Records can · Archivos De Nacimientos, Defunciones, Y Otros Eventos Visit the Spanish language version of the IDPH Vital Records website.
Vital Records | Cook County Clerk
Official Free
Birth / Death Records Request official records of births & deaths that occur in Chicago & suburban Cook County. Marriage / Civil Union Apply for a Marriage/Civil Union License for ceremonies in Chicago & suburban Cook County. Business / Notary Register an Assumed Business Name or Receive your Notary Public Commission Certificate approved by the IL Secretary of State. Frequently Asked Questions Frequently asked vital ...
We are Here to Help | Cook County Assessor's Office
Official Free
Assessment and tax records covering Cook County are published through this system. It is an official government source.
Recording Terms and Topics - Cook County Clerk
Official Free
The Cook County Clerk’s Office is merely a place where the resultant documents from a property transaction are recorded and, therefore, it is important to provide the following disclaimer: The Cook County Clerk’s Office does NOT endorse any private party website. How do I take my name off property I no longer want? (See also Mortgage Foreclosure and Deed in Lieu of Foreclosure)
Cook County Treasurer's Office - Chicago, Illinois
Official Free
No application is required if the Treasurer's Office can determine who made the overpayment using bank, credit card and property records. Applications are required if the Office cannot determine who made the overpayment. to search for any overpayments on your PIN. Click the "Apply Now" link to access the electronic refund application. Complete the contact form page and attach a file for ONE of the following proofs of payment for each payment.
2023 Tax Year Bill Analysis
Official Free
Property research in Cook County starts here: parcels, assessments, and tax detail. Confirm details with the official property and tax office before relying on them.
IDFPR Online Services Portal
Official Free
Welcome to the IDFPR Online Services Portal ! Please allow 2-4 business days for your application to post in our systems and your license status to update. If you attempted to make an online payment on April 2, 2026, please do not try to submit another payment.
Illinois State Board of Elections
Official Free
Archived District Maps 2001 Maps Cook County Subcircuits Downstate and Collar County Subcircuits 2022 Congressional District Map - NE Illinois 2022 Congressional District Map - Statewide 2022 Legislative District Map - NE Illinois 2022 Legislative District Map - Statewide 2022 State Senate District Maps and Descriptions 2022 State Representative District Maps and Descriptions 2022 Congressional District Maps and Descriptions · Search Find My Elected Officials
Voter Registration in Cook County.
Official Free
Below you can find information for each of the four ways to register during the standard voter registration period. Please make sure to check the specific deadline for the form you select as dates differ depending on the method of registration. If you have an Illinois driver's license or state ID, you may register online through the Illinois State Board of Elections website. If you do not have a driver's license or state ID, fill out a form online, print, sign and mail it in.