Mercer County property data
125,836 properties in Mercer County, New Jersey are on the live map, 113 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 Mercer County
Parcel layer is live; record linkage for this county is still being built out. 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.
Look up a single property
Any address in Mercer 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.