Jefferson Township property tax appeal, Cook County
The median residential assessment in Jefferson Township rose 18.6% at its 2024 reassessment, and of the appeals decided for tax year 2025, 12.6% of 14,258 at the Assessor changed the value and 42.3% of 28,095 at the Board of Review ended in a decrease. No filing window for tax year 2026 is published here: it wasn’t in the Assessor’s calendar when we last checked.
When Jefferson Township can appeal
No 2026 appeal dates are shown for this township: they weren’t published in the Assessor’s calendar when we last checked it. Check the Cook County Assessor’s calendar for the current window.
Jefferson Township Board of Review and Assessor appeal results by year
| Tax year | Closed Assessor appeals | Share that changed the value | Board of Review appeals | Share decreased |
|---|---|---|---|---|
| 2023 | 11,048 | 15.7% | 21,499 | 34.6% |
| 2024 | 43,829 | 28.5% | 47,552 | 46.7% |
| 2025 | 14,258 | 12.6% | 28,095 | 42.3% |
Residential property classes (class 2, including condominium units). An Assessor appeal counts as changed when the Assessor’s record says the value changed; a Board of Review appeal counts as decreased when its result is “Decrease”. Shares aren’t printed from fewer than 30 appeals. Past outcomes don’t predict the result of any one appeal.
Jefferson Township assessment increase, year on year
| Assessment year | Homes assessed in both years | Median change |
|---|---|---|
| 2024 | 139,764 | +18.6% |
| 2025 | 139,867 | +0.0% |
Assessor mailed values for class 2 properties in Jefferson Township, compared with the same property’s value the year before. Cook County reassesses one of its three regions (City for this township) each year; in other years the median change is usually 0%. The latest year can be partial while notices are still being mailed. 140,007 residential parcels are in the township today.
Jefferson Township appeals: common questions
When is the Jefferson Township appeal deadline?
We don’t publish one. Jefferson Township’s dates weren’t in the Assessor’s 2026 calendar when we last checked it, and we won’t print a deadline we haven’t verified. The Assessor’s own calendar, linked above, carries the current window.
What are the odds an appeal in Jefferson Township works?
In tax year 2025, 12.6% of the 14,258 closed residential appeals the Assessor decided for Jefferson Township changed the assessed value, and 42.3% of the 28,095 residential appeals the Board of Review decided ended in a decrease. Those are township-wide rates from closed cases, not a prediction for any one property.
Should I appeal to the Assessor or the Board of Review in Jefferson Township?
They are separate filings and the table above shows both. For 2025, Jefferson Township sent 14,258 residential appeals to the Assessor and 28,095 to the Board of Review; 12.6% and 42.3% of them respectively moved the value. The Board of Review hears appeals after the Assessor has closed a township, so missing the first window does not end the year.
How much did assessments go up in Jefferson Township?
At the 2024 reassessment the median residential assessment rose 18.6%, measured across the 139,764 class-2 properties the Assessor valued in both 2023 and 2024. That is the middle of the township, not your property: half the homes moved more.
What if the Jefferson Township window has already closed?
Nothing on this page files an appeal for you, and a closed window can’t be reopened here. The figures above are per tax year, so the same tables tell you what the next year’s filing looks like; the free assessment check compares your home with near-identical homes nearby whenever you run it.
Every answer here restates a figure printed elsewhere on this page. Nothing is added that we haven’t measured and sourced.
- Your own property: use the free assessment check, which compares your home with near-identical homes nearby.
- Tax bills, tax rates and exemptions.
- Commercial property and appeals filed with the Property Tax Appeal Board.
- Legal advice. CivicDelta doesn’t file appeals.
More: how a Cook County assessment appeal works · all 38 Cook County townships compared · everything we hold on property · how we compute these figures