Search Cook County Property Records, Understand Assessments, Check Exemptions, File Appeals and Pay the Correct Tax Bill
Use this guide to search a Cook County property by its 14-digit Property Index Number or address, review assessed values and exemptions, find township-specific appeal dates, check tax bills, claim refunds and research recorded deeds or liens.
Cook County does not have a Texas-style County Appraisal District. The Cook County Assessor values property and manages exemptions, the Board of Review hears assessment appeals, the Treasurer sends and collects tax bills, and the County Clerk maintains recorded land documents.
Independent guide — official portals are used only for the final search, application, appeal, payment or record request.Critical Corrections to the Existing Cook County CAD Article
| Existing Claim | Correct Cook County Information | Why It Matters |
|---|---|---|
| Cook County CAD | Cook County Assessor | Illinois does not use the Texas County Appraisal District system. |
| Search by owner name | The countywide Property Tax Portal begins with a 14-digit PIN or property address. | Using the wrong search method causes unnecessary failed searches. |
| Universal May 15 protest deadline | Assessor and Board of Review appeal windows vary by township. | A taxpayer must use the exact township opening and closing dates. |
| Universal April 30 exemption deadline | Application periods and renewal requirements differ by exemption and tax year. | Some exemptions renew automatically, while Senior Freeze requires annual reapplication. |
| One annual property-tax deadline | Cook County property taxes are billed in two installments with separately announced due dates. | The tax year and payable year are not the same thing. |
| Assessor collects taxes | The Cook County Treasurer sends bills and accepts payments. | Value questions and payment questions go to different offices. |
Which Cook County Office Handles Your Task?
Jump Directly to Your Task
How to Search Cook County Property Records
The official Cook County Property Tax Portal lets users search by a 14-digit Property Index Number or property address. It can display property description, values, exemptions, tax history, refund information, recorded-document summaries and appeal dates.
Use CookCountyPropertyInfo.com. This county-maintained portal connects information from several Cook County property-tax offices.
Use the PIN when available because it identifies the specific parcel or condominium unit. Use the address option when the PIN is unknown.
Enter the house number, street name and city. Do not include street directions such as N or S, and do not add abbreviations such as St. or Ave. unless the portal specifically requests them.
Compare the property address, municipality, township, classification, building details and PIN. Condominiums and multi-unit properties can have several PINs at one street address.
Open the property-description, exemptions, tax-history, documents, appeals and refund sections rather than relying only on the first value shown.
Print the result or save it as a PDF. The PIN is needed for tax payments, exemption checks, appeal filings, document research and most office enquiries.
Best Cook County Search Method by Situation
| Information You Have | Best Starting Search | What to Confirm |
|---|---|---|
| 14-digit PIN | PIN search | Address, municipality, township, unit and tax year. |
| Street address | Property-address search | Correct unit or parcel and associated PIN. |
| Condominium address | Address search followed by unit/PIN comparison | The unit’s separate PIN rather than the building’s other units. |
| Owner or seller name | Recorded-document search | Grantor, grantee, deed date and legal description. |
| Tax bill | Treasurer search using PIN | Tax year, installment, payment status and amount due. |
| Appeal notice | Property portal appeal section | Township, office, opening date and closing date. |
| Document number | County Clerk recordings search | Document type, parties, recording date and parcel connection. |
What Is a Cook County Property Index Number?
A Cook County Property Index Number, commonly called a PIN, is a unique 14-digit identifier assigned to a parcel or separately assessed unit. The PIN is more reliable than an owner name because ownership and mailing information can change.
Where to find the PIN
- Cook County property-tax bill
- Cook County Property Tax Portal result
- Assessor property record
- Closing statement or title paperwork
- Previous tax-payment receipt
- Recorded deed or related document in some cases
What the Cook County Property Record Shows
| Record Field | Plain-Language Meaning | What to Check |
|---|---|---|
| PIN | The unique 14-digit parcel or unit identifier. | Use the same PIN across Assessor, Treasurer, Clerk and appeal records. |
| Property location | The physical address associated with the parcel. | Unit, municipality and ZIP code. |
| Township | The assessment area used for scheduling and administrative purposes. | Township-specific Assessor and Board of Review appeal dates. |
| Classification | The county’s category for the property type and assessment treatment. | Residential, condominium, commercial, industrial, vacant or another class. |
| Estimated market value | The Assessor’s estimate of the property’s market value. | Property characteristics, condition and comparable evidence. |
| Assessed value | The value produced after applying the assessment level to estimated market value. | Do not confuse it with the final taxable EAV or bill. |
| Equalized assessed value | The assessed value after the state equalization factor is applied. | Exemptions are generally deducted from EAV when the bill is calculated. |
| Building and lot size | Physical characteristics used in property analysis. | Living area, lot size, units and other displayed attributes. |
| Exemptions | Approved reductions in equalized assessed value. | Review the five-year exemption history and the second-installment bill. |
| Tax code and rate | The local taxing-district combination and resulting rate. | Nearby properties can have different rates because taxing districts differ. |
How Cook County Assessment Numbers Become a Tax Bill
An assessment appeal challenges valuation or property-record issues. It does not directly challenge the budgets or levies adopted by school districts, municipalities and other local governments.
Cook County Property Description and Data Checks
Incorrect property characteristics can affect comparisons and estimated value. Review the record before beginning an appeal.
Cook County Homeowner, Senior, Disability and Other Exemptions
Exemptions reduce equalized assessed value rather than directly subtracting a fixed dollar amount from the tax bill. Approved exemptions generally appear on the second-installment bill.
| Exemption or Program | General Benefit | Important Filing Detail |
|---|---|---|
| Homeowner Exemption | Reduces EAV by $10,000 for a qualifying principal residence. | Check exemption history after buying, transferring or changing occupancy. |
| Senior Citizen Homestead Exemption | Reduces EAV by an additional $8,000 for a qualifying homeowner age 65 or older. | Generally renews automatically if the property was not sold to a new owner. |
| Senior Freeze | Can freeze qualifying EAV at a base level, although the tax bill can still increase. | The official current guidance lists a household-income limit of $65,000 and requires annual reapplication. |
| Persons with Disabilities Exemption | Reduces EAV by $2,000 for an eligible owner-occupant. | Proof of disability is required; current recipients are generally renewed automatically. |
| Veterans with Disabilities Exemption | Provides relief based on qualifying service-connected disability. | Use the application matching the veteran’s eligibility and supporting documentation. |
| Home Improvement Exemption | Can temporarily exempt qualifying value added by improvements to an existing home. | Confirm whether the improvement and value increase satisfy current rules. |
| Returning Veterans Exemption | Provides limited relief for eligible veterans returning from active duty. | Military-service dates and documentation are required. |
| First Responder Surviving Spouse Abatement | May provide relief to an eligible surviving spouse. | Review the Assessor or Board of Review instructions for the correct procedure. |
Exemption application checklist
- Correct 14-digit PIN
- Property address and unit
- Owner’s legal name
- Purchase or ownership date
- Principal-residence occupancy date
- Government-issued identification
- Prior residence information when requested
- Age, income, disability, military or surviving-spouse evidence where applicable
- Submission confirmation or mailed receipt
How to Check Whether an Exemption Was Applied
Use the Cook County Property Tax Portal and open the exemptions section.
Confirm which exemptions were applied for each tax year rather than relying only on the latest year.
Exemptions are reflected when the final annual tax calculation appears on the second installment.
A missed eligible exemption from an earlier bill may require a Certificate of Error application rather than an ordinary current-year application.
How Cook County Property Assessment Appeals Work
Cook County has more than one assessment-appeal level. Property owners must follow the filing window for the township in which the property is located.
Step-by-step appeal preparation
The Property Tax Portal displays the township and can show whether appeal filing is open at the Assessor or Board of Review.
Record the opening date, closing date, tax year and office. The Assessor and Board of Review do not necessarily use the same dates.
Check classification, building size, lot size, units, condition and other displayed details for factual errors.
Common arguments include overvaluation, lack of uniformity, incorrect property description, vacancy, damage or another fact-specific issue.
Use comparable properties, recent sales, photographs, appraisals, repair estimates, income records or other documents relevant to the argument.
Use the Assessor’s filing system during the Assessor window or the Board of Review portal during the Board’s township window.
Keep the confirmation number, submitted evidence, email notices and a PDF of the final appeal.
Use the relevant portal to review status and decision history. Read every decision and further-review deadline carefully.
Important Board of Review Representation Rules
| Property or Appellant | General Board of Review Rule | Practical Note |
|---|---|---|
| Individual homeowner | May represent themselves. | An attorney is not automatically required for an individually owned home. |
| Corporation-owned property | Must generally be appealed by an attorney. | Do not wait until the closing date to determine representation requirements. |
| LLC-owned property | Must generally be appealed by an attorney. | Review ownership before creating the filing account. |
| Tax consultant representing homeowner | A consultant may not represent a homeowner before the Board. | Use self-representation or a qualified attorney as permitted. |
| Small residential or mixed-use property | Residential filing generally covers qualifying properties under the Board’s unit and square-footage limits. | Larger properties may need the commercial filing process. |
Useful Cook County Appeal Evidence
| Property or Issue | Useful Evidence | Common Mistake |
|---|---|---|
| Single-family home | Comparable assessments, sales, condition photos and repair estimates. | Using homes from a different neighborhood, style or condition. |
| Condominium | Comparable units in the same building or similar buildings, floor, size, view and condition. | Comparing the wrong unit type or using the building’s address without matching PINs. |
| Two-flat or small apartment property | Unit count, rent information, condition, sales and classification details. | Ignoring legal unit count or mixed-use space. |
| Commercial building | Rent roll, leases, vacancy, operating expenses, capitalization analysis and comparable sales. | Providing only gross rent without expenses or vacancy. |
| Fire, flood or demolition damage | Dated photographs, insurance records, permits, reports and repair estimates. | Submitting evidence that does not show when the damage existed. |
| Incorrect square footage | Plans, appraisal, survey, permit records or reliable measurements. | Using an unsupported online estimate. |
| Vacant land | Zoning, access, assemblage limits, environmental issues and comparable land sales. | Comparing developable and constrained parcels as equal. |
| Uniformity argument | Similar properties with lower assessments after meaningful adjustments. | Selecting only low assessments without proving similarity. |
Assessor Appeal vs Board of Review Appeal
| Question | Assessor | Board of Review |
|---|---|---|
| Is it an appeal opportunity? | Yes, during the Assessor’s township filing window. | Yes, during the Board’s separate township filing window. |
| Is the deadline countywide? | No. Check the township calendar. | No. File by the township closing date. |
| Can an owner represent themselves? | Review the Assessor’s current filing rules. | Individual owners may generally represent themselves. |
| Can both be used? | An owner may begin here. | This is a separate opportunity under its own rules and dates. |
| Where are dates found? | Assessor calendar and property portal. | Board dates page and property portal. |
Cook County Property-Tax Bills and Installments
Cook County property taxes are billed in two installments. The tax year refers to the assessment year, while the bills are commonly payable in the following calendar year.
How to Search and Pay Cook County Property Taxes
Use the Property Tax Portal or tax bill and confirm the property address and condominium unit.
Search by PIN or property address through the Cook County Treasurer’s Property Tax Overview.
Do not confuse the first and second installments or a current bill with an earlier delinquent year.
Check whether the installment is unpaid, paid, partially paid, refunded or already submitted by a mortgage company.
Online ACH payment from a checking or savings account is offered without a standard transaction fee. Credit or debit card payments include a nonrefundable third-party convenience fee.
Compare the PIN, address, tax year, installment and total before submitting payment.
Download or print the confirmation and later verify that the payment posted to the correct PIN.
Cook County Tax-Payment Methods
| Method | Important Information | Best Practice |
|---|---|---|
| Online bank account | Standard ACH payment from checking or savings is offered without a fee. | Verify routing, account number and PIN before submission. |
| Credit or debit card | A nonrefundable convenience fee is charged by the third-party processor. | Read the exact fee on the final payment screen. |
| Use one check and payment coupon per PIN and write identifying details on the check. | Request a manual U.S. Postal Service postmark near the deadline. | |
| In person | Payment options and public-counter procedures can change. | Confirm current hours and accepted payment methods before visiting. |
| Participating bank | Certain bank-payment options may be available for current taxes. | Check eligibility, dates and required bill coupon first. |
| Mortgage escrow | A lender may receive and pay the bill. | Verify posting instead of assuming the lender completed payment. |
How to Read the Second-Installment Bill
| Bill Item | What It Means | What to Review |
|---|---|---|
| PIN and property address | Identifies the property being billed. | Correct parcel, condominium unit and mailing address. |
| Assessed value | Value certified after the assessment and appeal process. | Compare with the Assessor and Board decisions. |
| Equalization factor | State factor applied to assessed value. | Understand that this helps produce EAV. |
| Exemptions | Reductions applied to EAV. | Homeowner, Senior, Senior Freeze, disability or veteran relief. |
| Tax rate | Combined rate for taxing districts serving the property. | Nearby properties can have different rates. |
| Taxing districts | Governments receiving portions of the tax. | School, municipality, county, park, library and other districts. |
| First installment paid | Amount credited from the earlier installment. | Confirm the payment posted to the correct PIN. |
| Second installment due | Remaining amount required to complete the annual tax payment. | Due date, interest date and payment method. |
Cook County Refund, Overpayment and Sold-Tax Searches
The Treasurer’s property overview provides more than a tax-payment screen. It can also identify possible overpayments, uncashed checks and whether delinquent taxes were sold.
Refund verification checklist
- Correct PIN
- Tax year and installment
- Payment dates and amounts
- Names of payers
- Mortgage-company payment information
- Canceled checks or bank confirmations
- Certificate of Error or appeal decision
- Current mailing address
How to Find Cook County Deeds, Mortgages and Liens
The property-tax portal can show a summary of recent documents, but the Cook County Clerk’s recording system is the official source for recorded real-estate documents and purchased copies.
Use the county property portal to confirm the parcel and open the Documents, Deeds and Liens section.
Note the recording date, document type, document number and names associated with the record.
Search or order the document through the official Recordings Division.
The grantor generally transfers or grants an interest. The grantee generally receives the interest.
A matching name or address does not always prove that a document belongs to the intended parcel.
An informational image may be enough for research, while legal, lender or court use may require a certified copy.
Common Cook County Property Problems and Fast Solutions
| Problem | First Action | Correct Office |
|---|---|---|
| Address search returns no property | Remove street direction and suffix, then enter the city. | Property Tax Portal or Assessor. |
| Wrong condominium unit appears | Compare the unit’s 14-digit PIN. | Assessor property search. |
| Property characteristics are incorrect | Collect reliable measurements, photos and records. | Cook County Assessor. |
| Expected exemption is missing | Review five-year exemption history and the second-installment bill. | Cook County Assessor. |
| Need to appeal assessment | Check township opening and closing dates. | Assessor or Board of Review. |
| Payment does not appear | Review the receipt and confirm the PIN. | Cook County Treasurer before paying again. |
| Possible duplicate payment | Use the official overpayment-refund search. | Cook County Treasurer. |
| Need proof of ownership | Search the recorded deed and legal description. | Cook County Clerk Recordings. |
| Need exact boundary | Review deed and recorded plat. | Licensed surveyor or attorney. |
| Delinquent taxes may have been sold | Use the Treasurer’s sold-tax search immediately. | Cook County Treasurer and legal counsel when necessary. |
Cook County Homebuyer Due-Diligence Checklist
- Correct PIN and unit
- Property classification
- Estimated market and assessed values
- Building and lot details
- Township and tax code
- Current appeal or decision history
- Homeowner Exemption
- Senior or disability exemptions
- Five-year exemption history
- Whether prior-owner exemptions will end
- Application requirements after closing
- Certificate-of-error possibilities
- First and second installments
- Current payment status
- Prior-year taxes
- Refund or overpayment
- Sold-tax status
- Mortgage-escrow information
- Most recent deed
- Mortgages and releases
- Liens and judgments
- Easements and restrictions
- Condominium documents
- Probate or trust documents
Local Cook County Property Considerations
| Property Situation | Important Checks | Why It Matters |
|---|---|---|
| Chicago condominium | Exact unit PIN, floor, size, view, parking PIN and same-building comparisons. | One building can contain many separately assessed PINs. |
| Chicago two-flat or three-flat | Legal unit count, classification, basement use, condition and neighborhood comparisons. | Incorrect unit or class information can affect assessment analysis. |
| North or northwest suburban home | Township, school district, municipality, lot, condition and reassessment cycle. | Nearby suburbs can have different rates and appeal calendars. |
| South or southwest suburban property | Township deadline, classification, vacancy, condition and comparable properties. | Appeal windows and local market conditions vary significantly. |
| Commercial property | Entity ownership, attorney requirement, leases, vacancy, expenses and classification. | Commercial appeals have different evidence and representation needs. |
| Property with multiple PINs | Land, parking, condominium, adjacent parcel or separately assessed improvement PINs. | Each PIN may have its own bill, exemption status and appeal record. |
Cook County Property Office Details
| Office | Verified Contact Information | Use This Office For |
|---|---|---|
| Cook County Assessor |
118 N. Clark Street, Room 320 Chicago, IL 60602 Phone: 312-443-7550 Website: Cook County Assessor |
Property records, values, exemptions, certificates of error and Assessor appeals. |
| Cook County Treasurer |
118 N. Clark Street, Room 112 Chicago, IL 60602 Phone: 312-443-5100 Website: Cook County Treasurer |
Bills, payment, payment status, refunds, tax history, delinquency and sold taxes. |
| Cook County Board of Review |
118 N. Clark Street Chicago, IL 60602 Phone: 312-603-5542 Public hours listed: Monday–Friday, 9:00 AM–5:00 PM |
Residential and commercial assessment appeals during township filing periods. |
| Cook County Clerk Recordings | Official access: Cook County Clerk Recordings | Recorded deeds, mortgages, liens, releases, plats and certified document copies. |
Cook County Property Offices Map
The Assessor, Treasurer and Board of Review use offices in or near the Cook County Building at 118 N. Clark Street. Confirm the room number before travelling.
Official Cook County Property Resources
Use these links when you are ready to complete the final official action.
Top 10 Cook County Property Search FAQs
1. Is Cook County CAD the official property office name?
No. Cook County, Illinois does not use a Texas-style County Appraisal District. The correct valuation office is the Cook County Assessor.
2. How do I search Cook County property records by address?
Open the Cook County Property Tax Portal and choose address search. Enter the house number, main street name and city. Do not include street directions or abbreviations unless the portal requests them.
3. Can I search Cook County property records by owner name?
The main county property portal begins with a 14-digit PIN or property address rather than owner name. To research a person’s recorded deed, use the Cook County Clerk’s recording search and verify the legal description.
4. What is a Cook County PIN?
A Property Index Number is a unique 14-digit identifier assigned to a parcel or separately assessed unit. Condominiums and properties containing several parcels may have multiple PINs.
5. What is the difference between market value, assessed value and EAV?
Estimated market value is the Assessor’s estimate of property value. Assessed value results from the county assessment level. Equalized assessed value applies the state factor, after which eligible exemptions reduce the value used in the tax calculation.
6. What is the Cook County assessment-appeal deadline?
There is no single countywide May 15 deadline. Assessor and Board of Review appeal windows open and close by township. Search the property’s PIN and use the exact township deadline displayed by the official office.
7. Can I appeal to both the Cook County Assessor and Board of Review?
Cook County provides separate appeal opportunities through the Assessor and Board of Review, each with its own filing window and rules. Review the property’s township schedule before filing.
8. How much is the Cook County Homeowner Exemption?
The Homeowner Exemption reduces equalized assessed value by $10,000 for an eligible principal residence. Check the property’s exemption history and second-installment bill to confirm it was applied.
9. Where do I pay Cook County property taxes?
Use the Cook County Treasurer’s official Property Tax Overview. Confirm the PIN, address, tax year, installment and payment status before paying. ACH payment from a bank account is offered without a standard fee.
10. Where can I find a Cook County deed or lien?
Begin with the Documents, Deeds and Liens section of the Cook County Property Tax Portal, then obtain the recorded document through the Cook County Clerk’s Recordings Division. A recorded-document search does not replace a professional title examination.
Independent Guide and Editorial Note
County-CAD.us is an independent informational website. It is not affiliated with the Cook County Assessor, Cook County Treasurer, Cook County Board of Review, Cook County Clerk, Cook County Government or the State of Illinois.
Assessments, classifications, exemptions, township appeal dates, tax-bill due dates, payment charges, refund status, office hours and procedures can change. Use the official portal for the final search, application, appeal, payment or recorded-document request.
Editorial verification: July 14, 2026. The article was corrected to replace Texas CAD terminology, remove false countywide appeal and exemption deadlines, explain PIN-based searching and include current Cook County tax, exemption, appeal, document and refund procedures.
Estimate Taxes, Exemptions, Escrow, Protest Savings and Next Steps
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Property Tax Estimate Calculator
Estimate annual tax using property value, assessment ratio, exemptions and local tax rate.
Homestead and Exemption Savings
Estimate how much a homestead, senior, disabled, veteran or local exemption may reduce annual tax.
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Estimate monthly property tax, insurance, HOA and reserve cushion. Useful for buyers and homeowners comparing affordability.
Property Tax Protest Savings
Estimate possible savings if your appraised value is reduced after a protest, evidence review or correction.
Appraised Value Growth / Cap Impact
Estimate how a value increase or appraisal cap may affect taxable value. Rules vary by state, county and exemption status.
Home Buyer Monthly Budget Estimate
Estimate a more realistic monthly ownership cost by adding mortgage, property tax, insurance and HOA.
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