DuPage County Illinois Property Assessment Guide
Search DuPage County Property Assessments, PIN Records and Tax Bills
DuPage County does not operate like a county with one assessor setting every parcel value. Nine township assessors calculate the initial assessments, while the DuPage County Supervisor of Assessments coordinates the township rolls, handles county-level equalization, administers major exemption programs, publishes assessment changes and serves as clerk of the Board of Review.
The county property lookup then brings assessment, exemptions, tax districts, sales and Treasurer data together around one Property Index Number. This guide shows how to search that record, identify your township assessor, decode equalized assessed value, check 2025 taxes payable in 2026, apply for exemptions, prepare an assessment appeal and find recorded deeds or liens.
Search by PIN, street address, billing name or map
Identify the township assessor responsible for value
Check exemptions, districts, taxes, liens and sales
Track September 1, 2026 tax and appeal deadlines
Supervisor of Assessments
Aaron Croker, CAE, CIAO
Assessment phone
630-407-5858
Township assessors
9 local offices
Treasurer
Gwen Henry, CPA
Last reviewed
August 7, 2026
What DuPage County Property Owners Need to Know Right Now
The second installment is still ahead. For 2025 real-estate taxes payable in 2026, the first installment was due June 1, 2026 and the second installment is due September 1, 2026. If the first installment remains unpaid, use the live property record to review the current penalty and total due rather than paying the original coupon amount.
First installment unpaid
Search the Taxes Due section now. A late amount can include statutory penalty in addition to the original installment.
Second installment
September 1, 2026 is the published second-installment due date for 2025 taxes payable in 2026.
2026 assessment appeal
Do not use the September tax deadline as the appeal deadline. DuPage assessment complaint windows are tied to the township assessment-roll publication.
Two different years: The bill paid in 2026 is generally for the 2025 assessment/tax year. A 2026 assessment affects the taxes ordinarily payable in 2027.
Appeal timing: There is not one universal DuPage County assessment-appeal deadline for every township. Watch the county assessment-status information and your township’s published assessment roll rather than waiting for the tax bill.
Who Actually Handles DuPage County Property Assessment Records?
Township Assessor
- Initial parcel assessment
- Residential property characteristics
- Neighborhood comparables
- Many factual record corrections
- General Homestead Exemption administration
- Local assessment questions
Supervisor of Assessments
- Coordinates nine township assessors
- County equalization authority
- Senior and special exemptions
- Assessment change notices
- Board of Review administration
- County assessment statistics
Treasurer / Recorder
- Treasurer collects property taxes
- Treasurer shows unpaid balances
- Recorder keeps deeds and mortgages
- Recorder indexes liens and releases
- Recorder provides document images
- Neither office sets assessed value
DuPage structure in one sentence: Your township assessor normally establishes the initial assessment; the Supervisor of Assessments coordinates and equalizes the county assessment system; the Board of Review hears formal assessment complaints; the Treasurer collects the resulting taxes.
Different state structure: Illinois township assessment is very different from the Florida Property Appraiser model. For comparison, see this existing Volusia County Property Appraiser guide.
Choose the DuPage County Property Task You Need
Search a property
Use the county Property Lookup by PIN, street address, billing name or map.
Understand assessed value
Review township assessment, equalization, EAV, exemption credits and estimated market value.
Correct property facts
Contact the township assessor about building, parcel, classification or factual assessment-record errors.
Apply for an exemption
Determine whether the township assessor or Supervisor of Assessments administers the requested exemption.
Appeal assessment
Track the township publication date and file with the DuPage County Board of Review during the applicable window.
Pay or research taxes
Use the Taxes Due and tax-bill tools to verify installment amounts, payments, penalties or tax liens.
Jump to Your DuPage County Property Task
How to Search DuPage County Property Records
The county Property Lookup is the strongest starting point because it connects parcel identification with assessment information, exemptions, sales, taxing districts and Treasurer tax data.
Open DuPage County Property Lookup.
Go to propertylookup.dupagecounty.gov and accept the county disclaimer when prompted.
Choose a search method.
The portal supports Parcel Number or PIN Search, Address Search, Billing Name Search, Map Search and Board of Review hearing information.
Use the PIN when available.
The DuPage Property Index Number is the cleanest identifier for matching assessment, exemption, tax and recorded-document information.
Search an address with minimal information.
Start with the street number and core street name. Remove unit numbers or directional abbreviations when an exact address fails.
Use Billing Name Search when the property address is unknown.
Start with the surname, trust or principal business name and open every plausible parcel.
Open the exact PIN.
Match municipality, township, neighborhood, class and legal information before relying on the record.
Change the tax year when researching history.
Older assessment years can reveal previous values, exemptions, sales and tax information.
Use the Record Navigator.
Move between parcel profile, assessments, exemptions, sales, conveyance data, tax districts and Treasurer tax sections.
Save a printable version.
Use the portal’s printable summary or printable-page functions when preparing an appeal, closing file or exemption inquiry.
Portal disclaimer matters: The county states that assessment information reflects the last certified assessment date and can change. Treat the online record as a public data tool rather than a title guarantee or survey.
Six Fields to Match Before Using a DuPage County Property Record
PIN
Match the full parcel number.
Address
Confirm property location.
Township
Find the correct assessor.
Class
Residential, commercial or other.
Assessment year
Match the correct cycle.
Tax status
Review unpaid tax or lien flags.
Condominium warning: Unit number, common-interest percentage and PIN are especially important for condo searches. Two units can share the same building address but have different assessments, exemptions and tax accounts.
Find the Township Assessor Responsible for Your Property
DuPage County’s nine township assessors perform the initial assessed-valuation work. The township shown in the county parcel record tells you which local assessor to contact.
Addison Township
Includes many parcels around Addison, Wood Dale, Itasca and surrounding areas.
Bloomingdale Township
Includes Bloomingdale, Glendale Heights, portions of Carol Stream and nearby areas.
Downers Grove Township
Includes Downers Grove and multiple surrounding communities.
Lisle Township
Includes Lisle and portions of neighboring municipalities.
Milton Township
Includes Wheaton, Glen Ellyn and surrounding parcels.
Naperville Township
Covers a substantial portion of Naperville within DuPage County.
Wayne Township
Covers DuPage parcels within Wayne Township, including portions of several municipalities.
Winfield Township
Includes Winfield, portions of West Chicago and surrounding areas.
York Township
Includes Elmhurst, Villa Park, Lombard, Oak Brook and surrounding areas.
Do not guess your township from the city name: Municipal and township boundaries do not always line up. Use the township field shown on the exact PIN record.
Open the Supervisor of Assessments
From the official county page, use the Township Assessor Directory when you need the current township office, phone number or website.
How to Read a DuPage County Assessment Record
Market value
The estimated fair cash value of the real property.
Most Illinois non-farm property is assessed at one-third of market value.
Assessed value
The township assessor’s assessment before county/state equalization and exemptions.
Review changes and property facts.
Equalized assessed value
The assessment after applicable equalization factors.
Often abbreviated EAV.
Taxable EAV
EAV remaining after qualifying exemption reductions.
Tax rates are applied here.
| Record field | What it tells you | What to check |
|---|---|---|
| Property class | Residential, commercial or another classification. | Correct use and property type. |
| Neighborhood | Assessment neighborhood used for local analysis. | Comparable properties within similar market area. |
| Assessed value | Value placed on the property for assessment purposes. | Year-to-year change and market support. |
| Equalized value | Assessment after equalization. | County/state factor shown for the year. |
| Exemption credits | Homestead or other reductions applied to EAV. | Each qualifying exemption appears. |
| Tax code | Combination of taxing districts serving the property. | Municipality, schools and special districts. |
Illinois assessment rule: Most non-farm real property outside Cook County is assessed at 33⅓% of market value before equalization and exemptions. Farmland and certain preferentially assessed property follow different statutory methods.
How a DuPage County Assessment Becomes a Tax Bill
1. Market analysis
Township assessor estimates fair cash value using sales, cost, income or other accepted appraisal methods.
2. Assessment
Most ordinary Illinois real property is assessed at one-third of market value.
3. Equalization + exemptions
Applicable factors and exemption reductions produce taxable EAV.
4. Tax rates
Rates from the parcel’s overlapping taxing districts are applied to taxable EAV.
Why a successful assessment reduction may not equal the same percentage tax reduction: The final bill also depends on exemptions, tax rates, taxing-district levies, equalization and any later adjustments.
DuPage County Taxing Districts Explained
A DuPage property record can list many overlapping tax bodies. Depending on location, these can include DuPage County, the Forest Preserve District, a township, municipality, library district, park district, fire-protection district, sanitary district, mosquito-abatement district, school districts, community-college district, airport authority or special service area.
School boundaries matter
Two homes close together can fall into different elementary, high-school or unit-school districts.
Municipal boundaries matter
A parcel inside a municipality can have a different district mix from an unincorporated parcel.
Special districts matter
Fire, sanitary, library, park and special-service districts can change the combined rate.
Do not compare tax bills using sale price alone: Compare taxable EAV, exemptions and the tax-district list for both parcels.
How to Find and Print a DuPage County Property Tax Bill
Open Property Lookup.
Search by PIN or address.
Open the correct parcel.
Match the PIN, owner, location and township.
Find Property Tax Bill in the record actions.
The county instructions direct users to the Property Tax Bill option in the right-side navigation.
Select the correct tax year.
Remember that 2025 taxes are payable in 2026.
Allow the PDF to open.
Disable a popup blocker temporarily when the bill PDF does not appear.
Save both installment coupons.
Verify the PIN, first installment, second installment, due dates and total amount.
2026 bills mailed
2025 real-estate tax bills were issued for payment in 2026.
First installment
First installment due June 1, 2026.
Current guide date
Recheck any unpaid first installment for updated penalty.
Second installment
Second installment due September 1, 2026.
Delinquency
Unpaid amounts can accumulate penalty and eventually progress toward tax-sale procedures.
Electronic tax bill: The Treasurer offers electronic tax-bill registration. Ownership or email changes can stop delivery, and the taxpayer remains responsible for timely payment even when an emailed bill is not received or opened.
Register for Electronic Tax Bills
Prepare your email address, contact information, property address and 10-digit parcel number.
How to Pay DuPage County Property Taxes Safely
Search the exact parcel first.
Confirm PIN, tax year and installment before submitting money.
Open Taxes Due or the Treasurer payment route.
Use the payment option from the official county property record or Treasurer page.
Review current penalty if late.
Do not use the original installment amount when the due date has passed.
Choose bank-account payment or card.
Compare the processor charge before authorizing.
Verify the total authorization.
Match PIN, installment, tax year, payment amount and convenience fee.
Save the confirmation.
Retain the date, amount and confirmation number.
Recheck posting.
Return to the property record and verify the payment appears before assuming the tax is cleared.
Electronic bank payment
$0
The county promotes bank-account ePay as a no-convenience-fee online method.
Credit card
2.10%
The service-provider convenience fee is not retained by DuPage County.
Late-payment rule: Illinois law generally adds a 1.5% monthly penalty to delinquent real-estate tax installments in counties such as DuPage. Use the Treasurer’s current total rather than calculating it manually.
September 1 reminder: As of August 7, 2026, the second installment is not yet delinquent. Verify payment before the September 1 deadline when your mortgage lender or escrow company is supposed to pay.
“I am calling about DuPage PIN __________. Please confirm whether the first installment is paid, the exact amount due for the second installment, any penalty currently posted and whether another payment or escrow transaction is pending.”
How the DuPage County Assessment Appeal Process Works
The Board of Review is the final local authority for formal assessment complaints. It can lower an assessment that is too high, raise an assessment after notice when it is too low, address uniformity and perform other statutory review functions. It does not directly rewrite the tax bill.
No single countywide appeal date: DuPage filing periods are tied to township assessment-roll publication. A discussion with your township assessor does not automatically extend the formal filing deadline.
Find your township.
Use the township field on the exact property record.
Review the current assessment.
Compare the property card, market value, assessment, prior years and recent sales.
Speak with the township assessor early.
Factual errors can sometimes be explained or corrected without a formal complaint.
Do not let informal discussion consume the filing window.
Track the formal Board of Review deadline independently.
Prepare the Board of Review complaint.
Follow the current county rules, form requirements and evidence instructions.
File before the township deadline.
Keep proof showing the complete complaint was filed on time.
Prepare for the Board review or hearing.
Organize the evidence around overvaluation, lack of uniformity or factual error rather than general dissatisfaction with taxes.
Read the decision carefully.
The county states that Board decisions can be appealed to the Illinois Property Tax Appeal Board within the applicable 30-day period.
Open Board of Review
Check current rules, forms, members and hearing information.
Research Comparable Parcels
Compare PINs, neighborhood, class, assessed value and property details.
Illinois PTAB
Review state appeal requirements only after a qualifying local Board of Review decision.
Previous cycle context: DuPage County mailed the 2025-pay-2026 Board of Review decision notices on March 18, 2026. Those 2025 decisions had their own PTAB appeal period and are separate from a new 2026 assessment complaint.
Evidence Checklist for a DuPage County Assessment Complaint
Comparable assessments
Find properties similar in neighborhood, style, size, age and condition that are assessed lower.
Recent sales
Use arm’s-length sales near the relevant valuation period, with adjustments for material differences.
Professional appraisal
A qualifying appraisal can support a market-value claim when appropriately timed and documented.
Property-condition evidence
Use photographs, contractor estimates, engineering reports or records showing major defects.
Incorrect record facts
Document wrong square footage, finished basement, bathroom count, property class or improvement information.
Purchase evidence
A recent arm’s-length purchase can be relevant when supported by closing and sale documentation.
- Property PIN and township
- Current property record card
- Current and prior assessed values
- Comparable property PINs
- Comparable sales information
- Photographs showing condition
- Repair estimates where relevant
- Closing statement if recently purchased
- Independent appraisal when available
- Copy of every filed form
Uniformity argument: The Board of Review specifically evaluates whether comparable property is valued similarly. Do not choose comparables only because their taxes are lower—compare the assessment and physical property characteristics.
DuPage County Homestead and Property-Tax Exemptions
General Homestead
Maximum reduction of $8,000 in assessed value beginning with the 2023-payable-2024 period for qualifying owner-occupied principal residences.
Senior Homestead
Up to an additional $8,000 EAV reduction for qualifying owners age 65 or older.
Senior Freeze
Freezes qualifying EAV at a base-year amount when age, occupancy and household-income requirements are met.
Home Improvement
Can exempt qualifying assessment increases attributable to eligible home improvements for a limited period.
Disabled Persons
Illinois provides an EAV reduction for qualifying disabled homeowners.
Veterans with Disabilities
Benefits vary by service-connected disability level and qualifying property.
Returning Veterans
A temporary exemption can apply after qualifying active-duty service.
Adaptive Housing
Separate relief can apply to qualifying specially adapted housing.
Senior Tax Deferral
A state loan-style program can defer a qualifying portion of property tax rather than reducing assessment.
Preferential assessments
Open space, model homes and certain other statutory property types have separate rules.
General Homestead is usually township-administered: DuPage County states that in most cases the Township Assessor automatically grants the residential General Homestead Exemption without requiring a formal application. Contact the township assessor when it is missing.
DuPage County Senior Property-Tax Relief
Senior Homestead Exemption
Applicant must generally be age 65 by December 31 of the assessment year, own and occupy the residence and be liable for the real-estate taxes.
2026 Senior Freeze income
Illinois lists a total household-income maximum of $75,000 for taxable year 2026, payable in 2027.
Senior Tax Deferral
A separate program can defer qualifying property taxes as a loan secured by the property rather than reducing the assessment.
Senior Homestead proof checklist
- Completed exemption application
- Driver license or Illinois ID
- Passport or birth certificate when used for age proof
- Warranty, trustee or quitclaim deed
- Trust agreement when title is held in trust
- Title policy Schedule A when applicable
- Will and death certificate for inherited property when applicable
- Legal description matching the application
Send photocopies—not originals: The Supervisor of Assessments specifically advises senior applicants not to mail original proof-of-age or ownership documents because originals are not returned.
Senior Freeze is not a tax-rate freeze: It freezes qualifying EAV at a base amount. The final tax bill can still rise when rates increase or new improvements change the property’s taxable value.
Delinquency contact option: A senior receiving the Senior Homestead Exemption can designate an alternate person to receive a copy of a delinquency notice. The county publishes a one-time $5 registration fee for that service.
Open Official Senior Exemption Guidance
Review proof-of-age, ownership documentation, Senior Homestead information and links to Senior Freeze and tax-deferral programs.
DuPage County Property Records for New Homeowners
Owner name has not updated
Check whether the deed was recorded, then allow processing time before assuming the assessment database is wrong.
General Homestead does not appear
Contact the township assessor and confirm the qualifying occupancy period and ownership documentation.
Tax bill went to prior owner
Use the PIN to print the current bill. Property-tax responsibility is tied to the parcel even when mailing information is stale.
Escrow is supposed to pay
Verify the actual payment posting rather than assuming the mortgage company paid by the due date.
New-owner verification sequence
- Confirm deed was recorded
- Match PIN and legal description
- Check current mailing address
- Identify township assessor
- Verify General Homestead status
- Review tax-bill mailing information
- Check escrow payment posting
- Save closing and deed documents
Sale price versus assessment: A recent purchase is useful evidence, but the assessor and Board of Review can also consider market conditions, property characteristics, comparable sales and whether the sale was arm’s-length.
Search DuPage County Deeds, Mortgages, Liens and Recorded Documents
The Recorder of Deeds maintains the official recorded-document system. The online Digital Imaging System provides indexed documents and images beginning March 16, 1961, with search availability varying by index type and date.
Open the Recorder online document system.
Go to DuPage Recorder Online Documents.
Choose the appropriate search field.
Search by party name, parcel or other available document criteria.
Search current and prior owner names.
Try trusts, companies, former names and spelling variations.
Match the property.
Compare PIN, address, legal description, document date and parties.
Open the document image.
Review the recorded deed, mortgage, lien, release or other instrument.
Use certification when required.
A court, lender or title process may require a certified copy rather than an online image.
Recorded deed does not equal guaranteed clear title: Search results can identify recorded instruments, but a title company or attorney may be necessary to determine ownership interests, lien priority or insurability.
Special Property Record Situations
| Situation | Records to review | Best next step |
|---|---|---|
| Condominium | Unit PIN, common-interest percentage, class, assessment and exemptions. | Compare similar units in the same association before using outside comparables. |
| Commercial property | Class, sales, income information, assessment and tax districts. | Build market or income evidence appropriate to the property type. |
| New construction | Property characteristics, permits, completion date and assessment change. | Confirm the assessed improvement accurately reflects completed work. |
| Demolition | Prior property card, demolition permit, photographs and current assessment. | Ask township assessor when the removed improvement will be reflected. |
| Inherited property | Recorded deed, trust, probate documents, exemption status and tax account. | Update ownership and determine whether prior exemptions continue. |
| Tax lien shown | Taxes Due tab, tax lien year, redemption amount and final redemption date. | Contact the responsible county tax office immediately before relying on a saved amount. |
DuPage County Assessment, Tax and Recorder Contacts
Supervisor of Assessments
Aaron Croker, CAE, CIAO
421 N. County Farm Road
Wheaton, IL 60187
630-407-5858
421 N. County Farm Road
Wheaton, IL 60187
630-407-5858
Recorder research
Recorded-document research assistance
630-407-5401
630-407-5401
County general hours
Monday–Friday
8:00 a.m.–4:30 p.m.
Closed county holidays
8:00 a.m.–4:30 p.m.
Closed county holidays
Township-assessor visits: The township assessor is usually the more useful first stop for a factual property-card or local-assessment question. Use the county Supervisor of Assessments for county-level exemptions, Board of Review processes and township coordination.
DuPage County Property Search Problems and Practical Fixes
| Problem | Practical fix | Best office |
|---|---|---|
| Address returns no parcel | Remove unit, direction and street-type text; try PIN, billing name or map search. | Property Lookup / Township Assessor |
| Owner name is outdated | Verify deed recording and compare current Recorder document with assessment record. | Recorder, then Township Assessor |
| Property facts are wrong | Gather measurements, photographs, permits or other evidence. | Township Assessor |
| General Homestead missing | Confirm ownership and principal-residence qualification with township assessor. | Township Assessor |
| Senior exemption missing | Review age, ownership and application documentation. | Supervisor of Assessments |
| Tax bill did not arrive | Print the bill from Property Lookup and verify mailing information. | Treasurer / Assessment record |
| First installment still unpaid | Open Taxes Due for current penalty and total rather than paying original amount. | Treasurer |
| Escrow payment not visible | Compare mortgage-company transaction date with the live county posting. | Treasurer and lender |
| Assessment seems too high | Identify township, review comparables and track Board of Review filing window. | Township Assessor / Board of Review |
| Appeal deadline unclear | Check township roll publication and county assessment-status information immediately. | Supervisor of Assessments / BOR |
| Tax lien appears | Review lien year, amount to redeem and final redemption date; contact county office promptly. | Treasurer / Clerk tax redemption process |
| Need deed history | Search Recorder by current and prior owner and compare document dates and PIN. | Recorder |
“I am researching DuPage County PIN __________ at __________. The record lists __________ Township. I need help with __________. Please confirm whether this is a township assessment issue, county exemption issue, Board of Review matter, Treasurer tax issue or Recorder document issue.”
Final DuPage County Property Action Center
Use these official tools only after confirming the exact PIN, property, township and assessment or tax year.
DuPage County Property Assessor FAQs
1. How do I search DuPage County property assessment records?
Use the official DuPage County Property Lookup. You can search by Property Index Number, street address, billing name or map, then open the exact PIN to review assessment, exemptions, sales, taxing districts and Treasurer tax information.
2. Does DuPage County have one county assessor?
No. Nine township assessors calculate the initial property assessments. The DuPage County Supervisor of Assessments coordinates the township assessment system, performs county-level equalization functions, administers major exemption programs and serves as clerk of the Board of Review.
3. Which townships have assessors in DuPage County?
DuPage County has assessors for Addison, Bloomingdale, Downers Grove, Lisle, Milton, Naperville, Wayne, Winfield and York townships. Use the township shown on the exact property record rather than guessing from the municipality name.
4. When are DuPage County property taxes due in 2026?
For 2025 real-estate taxes payable in 2026, the first installment was due June 1, 2026 and the second installment is due September 1, 2026. Check the live Taxes Due record for any unpaid first-installment penalty.
5. How much is the DuPage County General Homestead Exemption?
The General Homestead Exemption can reduce assessed value by up to $8,000 for a qualifying owner-occupied principal residence. In most cases, DuPage County states that the local township assessor facilitates this exemption automatically.
6. What is the DuPage County Senior Homestead Exemption?
A qualifying property owner age 65 or older may receive an additional reduction of up to $8,000 in equalized assessed value. Applicants must meet the ownership, occupancy, tax-liability and documentation requirements published by the Supervisor of Assessments.
7. What is the 2026 income limit for the Illinois Senior Assessment Freeze?
Illinois lists a maximum total household income of $75,000 for taxable year 2026, payable in 2027. The Senior Freeze limits qualifying equalized assessed value but does not freeze the property-tax rate or guarantee that the tax bill will remain unchanged.
8. How do I appeal a DuPage County property assessment?
Identify the township assessor, review the assessment and supporting property data, discuss factual issues with the township when useful and file a formal complaint with the DuPage County Board of Review within the filing period tied to the township assessment-roll publication. Do not assume there is one countywide deadline.
9. How do I find a DuPage County deed, mortgage or lien?
Use the DuPage County Recorder’s online Digital Imaging System. Search the available indexes, open the relevant recorded instrument and compare the parties, document date, parcel information and legal description before relying on the result.
10. What should I do if a DuPage County property record is wrong?
First identify the type of error. Contact the township assessor for many property-characteristic or local-assessment issues, the Supervisor of Assessments for county exemption or Board of Review matters, the Treasurer for tax-payment problems and the Recorder for recorded deed or lien documents.
Official Sources and Editorial Verification
Supervisor of Assessments
Office duties, assessment system, county statistics, exemptions and township coordination.
DuPage Property Lookup
PIN, address, billing-name, assessment, exemptions, taxes, districts and sales.
Board of Review
Formal assessment-review authority, rules, members and appeal information.
Property Exemptions
Homestead, senior, disability, veteran and preferential assessment programs.
County Treasurer
Property-tax collection, payment options and delinquency information.
Recorder Online Documents
Indexed deeds, mortgages, liens, releases and recorded-document images.
What was checked for this guide: DuPage property-search methods, nine-township assessment structure, current Supervisor of Assessments, General and Senior Homestead rules, Senior Freeze income limit, Board of Review functions, 2026 property-tax due dates, current Treasurer and Recorder contacts, tax-payment fees and Recorder online-document availability.
CountyPropertyAppraiser.org is an independent informational website. It is not affiliated with DuPage County, any DuPage township assessor, the DuPage County Supervisor of Assessments, Board of Review, Treasurer, Recorder, Illinois Department of Revenue or Illinois Property Tax Appeal Board.
Assessments, exemptions, appeal periods, payment fees, tax balances, elected officials, office hours, forms and portal interfaces can change. Confirm time-sensitive information through the responsible official office before filing an appeal, paying taxes, recording a document, purchasing property or taking legal action.
Last reviewed: August 7, 2026.
Slug: dupage-assessor-property-search