The Cook County Treasurer's Office website was designed to meet the Illinois Information Technology Accessibility Act and the Americans with Disabilities Act.

Feb 20, 2026 · The Cook County Property Tax Portal, created and maintained by the Cook County Treasurer’s Office, consolidates information from the elected officials who take part in the property …

Cook County contains 134 municipalities in its region, the most well known being the City of Chicago – which is the County seat where the central offices of Cook County are located.

Mar 11, 2026 · Our staff is working to process them as soon as possible. If your Certificate of Error for valuation corrections has been approved and you are waiting for a refund, please check with the …

More than 40 percent of all residents of Illinois live within Cook County. As of 2020, the population was 5,275,541. The county seat is Chicago, the most populous city in Illinois and the third most populous …

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8 hours ago · Latest news from Cook County in Illinois.

1 day ago · Apr 10, 2026 9:56 pm - Perennial state and league power Barrington has dashed the hopes of the Hersey faithful over-and-over again, many times in postseason games during the first seven …

She served as Vice Chair of the Cook County Board’s Transportation Committee and has been active on issues involving health care and violence prevention, working to put her stamp on the 5th District by …

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