06/18/2026 | Press release | Distributed by Public on 06/18/2026 10:28
A final 2025 property tax equalization factor of 3.0300 for Cook County was announced by the Illinois Department of Revenue.
The Department is required by law to calculate the factor, often called the multiplier, to achieve uniform property assessment throughout the state.
See 2025 Cook County Final Multiplier Announced for more information.