Progress Report: Cook County Property Assessment
Cook County, Illinois, made substantial progress in improving the fairness of residential assessments from 2019 to 2024, according to a recent study. By all measures, regressivity—the tendency for lower-priced properties to be assessed at higher rates, relative to their actual sale price, than higher-priced properties—has been dramatically reduced, relative to the assessments imposed before that six-year period. These improvements have resulted in over a billion dollars in aggregate tax savings for owners of middle and lower-priced properties, relative to the over-taxation they experienced previously. While areas for improvement remain, Cook County is within industry standards for residential assessment fairness for the first time in years.
Publication Date: October 2025
Author: Chris Berry
