Departments
Assessor’s Office

Assessor’s Office

Please note that the Lemont Township Assessor’s Office is open by appointment only. To make an appointment:

call us at 630-257-2522
click on an appointment button at the bottom of this page

Welcome to the Township of Lemont Assessor's office!

We are first and foremost your local property tax advocate. Our office provides many services to the residents of Lemont Township:

Assistance with Filing for Homeowner, Senior, Senior Freeze, Disability and Veterans Exemptions

Property tax exemptions are savings that contribute to lowering a homeowner’s property tax bill.

Click here for more information: Property Tax Exemptions | Cook County Assessor's Office

Assistance to residents with completing Certificate of Error

A Certificate of Error is a way to make a correction after the assessment for that tax year is finalized. Homeowners can apply for multiple exemptions and tax years using one consolidated form. Please note that Certificates of Error applications can be denied.

Click here for more information: Certificates of Error | Cook County Assessor's Office

Assistance with filing appeals to the Cook County Assessor and the Cook County Board of Review

Things to consider when filing for an appeal: If the property characteristics listed on your assessment notice are incorrect, or if the estimated market value of your home is significantly more than what you believe your home could sell for in the current real estate market, you should file an appeal. If the property characteristics on the notice are correct and the estimated market value is within 10 percent of what you think your home is worth, then it is unlikely that an appeal would change your property’s assessed value enough to significantly affect its property tax bill.

Click here for more information: Overview of How Appeals Work | Cook County Assessor's Office

Requesting a tax bill

You can obtain a copy of your tax bill by using your Property Index Number (PIN) or home address, or you can start the process of updating your information on the Cook County Treasurer’s website.

Click here for more information: Cook County Treasurer's Office - Chicago, Illinois

Change of name and address

Our office can assist you in making any changes needed on your tax bill.

To make an apointment with our assessor's office, scroll to the bottom of this page and click the 'Schedule an Appointment' button.

Access to Sidwell (Township property) maps

If you wish to review these maps, our office has hardcover copies of the most recent Sidwell maps available.

To make an apointment with our assessor's office, scroll to the bottom of this page and click the 'Schedule an Appointment' button.

Notary services

Our office can notarize your documents at no cost.

To make an apointment with our assessor's office, scroll to the bottom of this page and click the 'Schedule an Appointment' button.

To apply for past exemptions, you may use the below Certificate of Error form

Need to check on the status of a Certificate of Error that has been previously submitted? Click the button below.

With the release of Cook County 2024 First Installment Property Tax Bills, homeowners should check to make sure they are not missing property tax-saving exemptions on their bills. Homeowners are encouraged to review the bottom left corner of the tax bill to confirm their exemption deductions. Most homeowners are eligible for the Homeowner Exemption, which saves an average of approximately $950 dollars. Senior homeowners over 65 are likely eligible for additional property tax savings with the Senior Exemption.

For more detailed information regarding Cook County’s Property Tax System, click here.

Assessor's Office Helpful Links

Assessor's Office Helpful Downloads

Contact the Lemont Township Assessor Team:

Please note that the Lemont Township Assessor’s Office is open by appointment only. To make an appointment:

call us at 630-257-2522
click on an appointment button below

Mario Mollo

Lemont Township Assessor
phone: 630-257-2522 ext 121
assessor@lemonttownship.org

Diana Groselak

Lemont Township Deputy Assessor
phone: 630-257-2522 ext 116
diana@lemonttownship.org

Lisa Kairis

Lemont Township Deputy Assessor Assistant
phone: 630-257-2522 ext 100
lisa@lemonttownship.org

What should I bring with me to my appointment?

Homeowner Exemption

Documentation Required to Apply

Proof of Identity and occupancy in 2023.

A copy of one photo ID from List A must be provided. The name and property address must match the application and the date of issue must verify that you occupied this property in 2023.
List A: Photo IDs that verify identity and occupancy
• Illinois Drivers License / ID Card
• Matrícula Consular ID

If the address on your photo ID does not match the property address, a copy of one document from List B and one from List C must be provided.

List B: Photo IDs that verify identity
• Illinois Drivers License / ID Card
• Matrícula Consular ID
• US Military ID
• Passport
• Certificate of Naturalization (N-550/N-570)
• Permanent Resident Card (I-551)
• Refugee Travel Document (I-571)
• Employment Authorization Card (I-766)

List C: Documents that verify occupancy in 2023
• Bank statement
• Landline, cable, or internet bill
• Pay stub or Social Security Award letter
• Voting record from 2023 (from Cook County Clerk’s office or Chicago Board of Elections)

2. Proof of Property Tax Liability

If you are listed on the deed recorded at the Cook County Clerk’s Office, this verifies your property tax liability. The Assessor’s Office staff can verify recorded deeds for you, so you do not need to provide a document.
If you are NOT listed on the recorded deed, please provide one of the following documents to verify you are liable for payment of property taxes for this property:
- Deed (if not recorded) or contract for a deed
- Trust Agreement
- Stock Certificate
- Occupancy Agreement

Senior Exemption

Documentation Required to Apply

Proof of age and identity and occupancy in 2023.

A copy of one photo ID from List A must be provided. The name and property address must match the application and the date of issue must verify that you occupied this property in the calendar year 2023.
List A: Photo IDs that verify identity and occupancy
• Illinois Drivers License / ID Card
• Matrícula Consular ID
If the address on your photo ID does not match the property address, a copy of one document from List B and one from List C, and an Occupancy Affidavit must be provided.

List B: Photo IDs that verify identity and date of birth
• Illinois Drivers License / ID Card
• Matrícula Consular ID
• Passport
• Certificate of Naturalization (N-550/N-570)
• Permanent Resident Card (I-551)
• Refugee Travel Document (I-571)
• Employment Authorization Card (I-766)

List C: Documents that verify 2023 occupancy
• Bank statement
• Landline, cable, or internet bill
• Pay stub or Social Security Award letter
• Voting record from 2023 (from Cook County Clerk’s office or Chicago Board of Elections)

2. Proof of Property Tax Liability

If you are listed on the deed recorded at the Cook County Clerk’s Office, this verifies your property tax liability. The Assessor’s Office staff can verify recorded deeds for you, so you do not need to provide a document.
If you are NOT listed on the recorded deed, please provide one of the following documents to verify you are liable for payment of property taxes for this property:
- Deed (if not recorded) or contract for a deed
- Lease
- Trust Agreement
- Stock Certificate
- Occupancy Agreement

Low-Income Senior Freeze Exemption

Documentation Required to Apply

Proof of age and identity and occupancy in 2023.

A copy of one photo ID from List A must be provided. The name and property address must match the application and the date of issue must verify that you occupied this property in 2023.
List A: Photo IDs that verify identity and occupancy
• Illinois Drivers License / ID Card
• Matrícula Consular ID

If the address on your photo ID does not match the property address, include a copy of one document from List B and one from List C.

2. Proof of Property Tax Liability

If you are listed on the deed recorded at the Cook County Clerk’s Office, this verifies your property tax liability. The Assessor’s Office staff can verify recorded deeds for you, so you do not need to provide a document.
If you are NOT listed on the recorded deed, please provide one of the following documents to verify you are liable for payment of property taxes for this property:
- Deed (if not recorded) or contract for a deed
- Lease
- Trust Agreement
- Stock Certificate
- Occupancy Agreement

3. Total Household Income Verification

The application will guide you through what counts as income for every member of the household. You can also view these Step-by-Step Instructions for Income Verification.
4. If the applicant was enrolled in any of the following programs in 2023, proof of enrollment in 2023 is needed. In this instance, the Income Verification doesn’t need to be completed.
Aid to the Aged, Blind or Disabled (AABD) Program
Supplemental Nutrition Assistance Program (SNAP)
Low Income Home Energy Assistance Program (LIHEAP)
The Benefit Access Program
Senior Citizens Real Estate Tax Deferral Program

Persons with Disabilities Exemption

Documentation Required to Apply

1. One of the following documents is required.

Class 2 Disabled Person Illinois Identification Card from the Illinois Secretary of State’s Office.
Proof of Social Security Administration disability benefits. This proof includes an award letter, verification letter, or annual cost of living adjustment.
Proof of Veterans’ Administration disability benefits. This proof includes an award letter of total (100%) disability, pension statement, or statement showing compensation rated at 100%.
Proof of pension for a non-military service-connected disability.
Proof of Railroad or Civil Service disability benefits is an award letter of total (100%) disability.
If a taxpayer can not provide proof with one of the items listed above they will need to submit the Illinois Department of Revenue’s Form PTAX 343-A Physician’s Statement of Proof of a Disability, completed by a
physician or optometrist. The taxpayer may also be required to be re-examined by an IDOR-designated physician.

2. Proof of Identity and occupancy in 2023.

A copy of one photo ID from List A must be provided. The name and property address must match the application and the date of issue must verify that you occupied this property in 2023.
List A: Photo IDs that verify identity and occupancy
• Illinois Drivers License / ID Card
• Matrícula Consular ID
If the address on your photo ID does not match the property address, a copy of one document from List B and one from List C.

Veterans with Disabilities Exemption

Documentation Required to Apply

A first-time applicant must please provide a Department of Defense DD Form 214, certified by either the Cook County Clerk’s Office or Illinois Department of Veterans Affairs. This document is not required for those reapplying.
All applicants, must provide a Disability Certification Letter from the U.S. Department of Veterans Affairs.

Verification letters will be used to verify the veteran’s name, percentage of service-connected disability, and effective date. Please see examples of required verification letters.
- To obtain a letter from the Illinois Department of Veterans Affairs, follow these steps.
  1. Dial 1-800-827-1000.
  2. You will hear two recorded messages.
  3. At the end of the second recorded message (Covid-19 Vaccination Availability), press option 1.
  4. Listen carefully, you will be asked a series of benefit questions and information on how to access your benefit letter.
  5. Speak clearly into the automated system if you would prefer a system-generated letter
A non-remarried surviving spouse of a veteran with a disability who is eligible for the Exemption and is using the Exemption for the first time or transferring it to a new address: you must provide the disabled veteran’s death certificate and proof of ownership.
3. If your property has been identified as a class 2-11 (two to six residential apartments) or a 2-12 (two to six mixed-use apartments). This exemption only applies to $250,000 of the equalized assessed value (EAV) of your primary residence, excluding the EAV of property used for commercial purposes or units rented for more than 6 months. To determine your level of relief, please complete this Affidavit as to the Number of Units at the Subject Property that includes a statement on the number of units that were rented in 2023.
4. Proof of Identity and occupancy in 2023.
A copy of one photo ID from List A. The name and property address must match the application and the date of issue must verify that you occupied this property on or before January 1, 2023.
List A: Photo IDs that verify identity and occupancy
• Illinois Drivers License / ID Card
• Matrícula Consular ID
If the address on your photo ID does not match the property address, a copy of one document from List B and one from List C.

List C: Documents that verify 2023 occupancy (must demonstrate property occupancy in 2022)
• Bank statement
• Landline, cable, or internet bill
• Pay stub or Social Security Award letter
• Voting record from 2023 (from Cook County Clerk’s office or Chicago Board of Elections)

For more detailed information regarding Exemptions, click here.

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Assessor’s Office

Please note that the Lemont Township Assessor’s Office is open by appointment only. To make an appointment:

Welcome to the Township of Lemont Assessor's office!

To apply for past exemptions, you may use the below Certificate of Error form

Need to check on the status of a Certificate of Error that has been previously submitted? Click the button below.

Assessor's Office Helpful Links

Assessor's Office Helpful Downloads

Contact the Lemont Township Assessor Team:

Please note that the Lemont Township Assessor’s Office is open by appointment only. To make an appointment:

Mario Mollo

Diana Groselak

Lisa Kairis

What should I bring with me to my appointment?

Documentation Required to Apply

Documentation Required to Apply

Documentation Required to Apply

Documentation Required to Apply

Documentation Required to Apply

Do you want to receive email notifications from us?

Sign up to receive email alerts or phone call notifications from our Lemont Township Assessor's Office. Click the button below and enter your contact information.