Cook County launches app for viewing tax maps

Cook County officials are unveiling a new interactive application that will provide the public with free viewing access to the county’s tax maps.

The new Tax Map Viewer app was developed in partnership between the Cook County Clerk’s Office and the Cook County Bureau of Technology to enhance access to current tax maps, which are typically requested for property tax purposes. Users can now view unofficial copies of tax maps online for free dating back to 2019.

"This app showcases our commitment to leveraging technology for the benefit of our residents,” County Board President Toni Preckwinkle said. “The Tax Map Viewer aligns with our strategic goals of promoting transparency and accessibility in government services."

The clerk’s Map Department draws the county’s official tax maps using the legal description of properties to establish the Property Index Number (PIN) for each parcel for tax purposes. The tax maps show the boundaries of each parcel and identify the unit numbers within each condo development. The county tax maps are updated each year, reflecting the divisions, subdivisions and consolidations of property processed annually by the clerk's office in conjunction with the Cook County Assessor's Office.