What the county's own roll says, and how many parcels sit above their neighbours.
121,764parcels on record
752with a published assessment
$35,660median assessed value
0above their neighbourhood median
A median has half of everything above it by definition, boards do not grant every
uniformity claim, and being above a median is a ground to argue rather than proof of error. These
are assessed values, not tax bills.
Your deadline in Madison County
30 days from the publication of your township's assessment roll in the local newspaper. The window is short and it is not the same date across the county.
Statutory basis: 35 ILCS 200/16-55.
A late filing cannot be cured, so confirm the date on your own notice — it is not the same across the county.
How the assessment was calculated
Illinois assesses at 33.33% of market value.
The assessor estimates market value by mass appraisal — a model over recent sales, adjusted by the
characteristics they hold on file for your property. If those characteristics are wrong, the number
is wrong. The full anatomy is here.
The argument most people miss
Beyond “my house is worth less than they say”, the Illinois Constitution requires uniform
taxation. If comparable property near you is assessed at a lower rate per square foot, that is a
ground for relief in its own right — no appraisal needed, and built from figures the assessor
published themselves.