Cook County sales tax rate, Illinois
Quick answer
Combined sales tax in Cook County runs 10.25% across the cities we cover, on top of Illinois's 6.25% state rate. The county share is a separate line from any city or special-district increment, which is why two addresses in the same county can pay different totals.
Cities in Cook County
County share shown separately from the city and district layers.
| City | State | County | City + districts | Combined |
|---|---|---|---|---|
| Chicago | 6.25% | 1.75% | 2.25% | 10.25% |
Source: Illinois Department of Revenue · rates as published for 2026