The sales tax in the City of Chicago, Illinois is:9.5%currently the highest amount in the United States.On January 1, 2012, the sales tax decreased from 9.75% Chicago Sales Tax News 12/31/2011 - Quarter cent tax cut, but sales tax still highest in Chicago - Chicago Sun-Times 12/1/2009 - Cook County Board votes to cut sales tax despite Stroger plea - Chicago Tribune
12/31/2011 - Quarter cent tax cut, but sales tax still highest in Chicago - Chicago Sun-Times
12/1/2009 - Cook County Board votes to cut sales tax despite Stroger plea - Chicago Tribune
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