Property & Parcel Data

Property and parcel data forms the foundational layer of the real estate data stack. It describes the physical and legal characteristics of a land parcel or building: lot boundaries, building footprint, square footage, number of units, year built, construction type, and legal description. This data is sourced primarily from county assessors and GIS departments, then standardized by private aggregators. It is the starting point for virtually every downstream use case — from valuation and investment to insurance and urban planning.

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Why this category matters

—Covers 155M+ parcels standardized from 3,100+ county GIS offices
—Includes GIS boundary coordinates and building footprint data
—Used as the foundation for valuation, insurance, and investment workflows

Common use cases

—Property due diligence
—Investment screening
—Insurance underwriting
—Urban planning
—PropTech application development

Key datasets in this category

ATTOM Data

ATTOM Property Data

Comprehensive property characteristics, tax, deed, and mortgage data for 158M+ US properties.

Regrid

Regrid Parcel Data

Standardized parcel boundaries and attributes for 155M+ parcels nationwide.

CoreLogic (Cotality)

CoreLogic Property Records

Enterprise property data covering characteristics, ownership, and transaction history.

Guide to using this category

County Assessor vs. Private Aggregators

County assessors are the authoritative source but vary widely in data quality and access. Private aggregators like ATTOM and Regrid standardize these records into consistent, API-accessible formats.

Understanding Parcel IDs (APNs)

The Assessor Parcel Number (APN) is the primary key for linking property datasets. Format varies by county — always normalize before joining datasets.