City of Chicago County property data
871 properties in City of Chicago County, Illinois are on the live map, 871 of them carrying linked permit, violation, sale, or event records. These are the map's own served counts — the same numbers any visitor can verify by opening the county on the map.
Coverage in City of Chicago County
Most mapped properties carry linked records. Every property sits on the owned county parcel layer; linked records draw from building permits, code violations, complaints, deeds and sales, assessments, and certificates of occupancy where the county and its cities publish them. Coverage grows continuously — counts on this page refresh with the map pipeline. How records attach to parcels, including published per-county match rates, is documented on the data quality page and the methodology page.
Permit approval speed
Median calendar days from filing to issuance in City of Chicago County, computed from real filed/issued date pairs over the last 3 years. Published only where the sample is large and clean; see the methodology page.
Look up a single property
Any address in City of Chicago County can be opened as a free property report — permits, violations, sales, and parcel facts for that one property — on the property report page, or browsed visually on the live map.