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You should read this first before inspecting this graphic.
To ensure that my TAZ geocoder found the correct Traffic Analysis Zone for the address I submitted, I took the resulting ID, 294518, and searched for that in the GIS shapefile within the free and open-source QGIS application.
Yep, that's about the location of 3201 S Halsted!
The United States Census Bureau manages the TAZ boundaries and designations, but I think the local MPOs and DOTs can change them.
Transportation Analysis Zones (the new name for TAZ) are discontinued after the 2011 CTPP data release.