Parcel
A parcel is the unit of land a county tracks for taxation: a defined boundary with its own identification number (APN — assessor's parcel number), owner of record, and assessed value. Every property search, tax bill, and deed ultimately points at a parcel.
What parcel data contains
A county's parcel layer ties together the map and the tax roll: boundary geometry, the APN, the owner of record, the site address, the owner's mailing address, assessed and market values, land use codes, and usually the last sale date and price. It's the backbone of every property-data product — commercial providers like Regrid and ATTOM aggregate and normalize county parcel layers into national datasets.
Why prospectors care
Parcels are how you go from "this area on a map" to "these specific owners." Draw a boundary, intersect it with the parcel layer, and you have every property inside it with its ownership fields — the raw material for farm lists, absentee lists, and circle prospecting. Parcel viewers (LandGlide, Regrid's app) show this per tap; prospecting tools like WhoseTitle turn the same layer into filtered lead lists.