If your taxpayer exemption application is being mailed to the wrong address, so might your tax bill, your reassessment notice and other important property tax correspondence. You should call the Treasurer’s Office to have this corrected. The Treasurer’s phone number is (312) 443-5100. They will mail you the proper form for you to complete and return to the Treasurer’s Office. You may also visit their Web site at www.cookcountytreasurer.com.