Independent service. Not affiliated with Cook County, the Cook County Assessor or the Board of Review. Filing with the county is free.

Lemont Township: Assessor window closed — Board of Review next

Lemont Township is bigger than the Village of Lemont: it also covers other places. Places with the most homes in Lemont Township: Lemont, Unincorporated areas.

Board of Review next

The Assessor's window closed September 29, 2026.

Next: the Board of Review. Its dates for this township are not published yet; the Board opens townships in groups after the Assessor certifies them. You can appeal there even if you did not appeal to the Assessor.

Lemont Township 2026 dates

Assessor notices mailed	August 17, 2026
Assessor appeals open	August 17, 2026
Assessor last file date	September 29, 2026
Board of Review open	not published yet
Board of Review close	not published yet

Sources: Assessor's assessment calendar, Board of Review dates page. Checked on October 2, 2026.

Was Lemont Township reassessed in 2026?

Yes. Lemont is in the south and west suburbs, which the Assessor reassesses in 2026. Cook County reassesses each area once every three years, so every owner here gets a Reassessment Notice with the property's characteristics and an updated estimated market value.

How values moved here: for the typical house, the first-pass 2026 assessed value is +26.5% compared with the final 2025 value (median of 8,080 houses with both values). Our calculation from Cook County open data (Assessed Values), not an official figure. Your own home can differ a lot from the typical one.

The Assessor publishes residential valuation reports for each township it reassesses: Assessor's valuation page for Lemont. A higher value does not mean the bill goes up by the same amount: your bill depends on your share of the total value, exemptions and local levies.

Source: Assessor's calendar.

Lemont Township at a glance

8,775 residential (class 2) parcels, including 232 condominium units.
Cities and villages with the most homes: Lemont (7,030), Unincorporated areas (1,690).
Main ZIP codes: 60439.

Our calculation from Cook County open data (Assessor Parcel Universe), October 5, 2026. Townships, cities and ZIP codes overlap, so the address check is the reliable way to confirm yours.

Appeals in Lemont Township last year

For tax year 2025, 2,054 residential property appeals from Lemont Township were filed at the Board of Review, and 1,438 at the Assessor. Appealing is a routine step for many owners here.

Our count from Cook County open data (Board of Review Appeal Decision History, Assessor Appeals), counted by property, not official figures.

How to file in Lemont Township

Confirm your PIN and township. Use the Assessor's address search or our free check below.
Check the notice. The Assessor's rule of thumb: if the characteristics on your notice are correct and the estimated market value is within 10% of what you think your home is worth, an appeal is unlikely to change much. Wrong square footage, rooms or other characteristics are a reason to appeal.
File online with the Assessor. On the county's online appeal site choose the residential appeal (or "Residential with Comparable Grid" if you argue lack of uniformity). The Assessor says filing is free and can take as little as 20 minutes, and that you don't need to hire anyone.
Comparables are optional. Assessor analysts review similar homes themselves. You may attach up to 6 comparable PINs from your neighborhood that resemble your home in size and style.
Board of Review is a second chance. When the Board opens Lemont, you can file there too (online, free). Individual owners may represent themselves; the Board's decision sets the final county value for the year.

More detail: how to appeal step by step · Assessor or Board of Review · choosing comparables.

What our packet adds

Filing is free and you can do it without us. If our free check says your home is assessed above similar homes, you can buy a document packet for $49: the comparable homes, the value to ask for, suggested text and step-by-step filing instructions for Lemont Township.

One-time $49. No subscription and no share of your savings.
Refund: if you file using the packet and the county does not lower your assessed value, send us the decision within 30 days and we refund the full price (terms).
You file yourself on the county's site. We don't file or represent anyone, and no result is guaranteed.

See a sample packet

Questions

What is the Lemont Township appeal deadline in 2026?

The Assessor's last file date for Lemont Township is September 29, 2026. The Board of Review has not published its dates for this township yet.

I missed the Assessor deadline. What now?

You can still appeal to the Board of Review when it opens your township, even if you did not appeal to the Assessor.

Should I appeal to the Assessor or the Board of Review?

You can do both. The Assessor's window comes first; the Board of Review is a separate agency and its decision sets the final county value for the year.

Was Lemont Township reassessed in 2026?

Yes. The south and west suburbs, including Lemont, are reassessed in 2026, so owners get a Reassessment Notice with an updated estimated market value.

Can appealing raise my assessment?

Under Illinois law (35 ILCS 200/16-95) the Board of Review may not increase an assessment unless the owner is first notified in writing and given a chance to be heard.

I think I missed an exemption. Can I get it back?

Missed homeowner and other exemptions for past years can be requested from the Assessor through a Certificate of Error. The Assessor's page currently lists tax years 2021 to 2025 for the homeowner exemption.

Nearby townships

All 38 Cook County townships and deadlines

Sources

Dates last checked against the Assessor's calendar and the Board of Review's published dates on October 2, 2026. If anything here differs from the county's own pages, the county's pages win.