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Foundational physical and legal characteristics of land parcels and buildings across the US.
Illinois uses a mortgage lien theory. County recorders and clerks maintain property records. The state has a real estate transfer tax. Cook County (Chicago) has a separate transfer tax and is the dominant market.
14 sources available
Comprehensive property data API covering 158M+ properties.
ATTOM's Property Data API provides access to real estate datasets for over 158 million U.S. properties. It offers data on ownership, valuations, mortgage, demographics, and market trends.
Official property assessment data for parcels in Cook County, Illinois.
Enterprise property data API with comprehensive coverage.
Cotality provides real estate property data and analytics, offering insights into the property ecosystem. It harmonizes technology, data, and expertise to deliver a rich view of property information.
RESO-compliant real estate data including MLS, assessor, and deed data.
RealEstateAPI provides access to property records, MLS listings, and historical sales data. It offers advanced search capabilities and tools for portfolio management.
Regrid provides parcel data with boundaries, buildings, addresses, and geographic enrichments. It unifies fragmented property records into a nationwide and globally expanding dataset.
Standardized parcel boundaries for 155M+ parcels nationwide.
Rental market data and automated valuations.
Parcel data covering over 99% of U.S. properties, updated daily, accessible via API, bulk download, and web platform.
Real-time US address autocomplete returning only verified USPS addresses with fuzzy matching and state/ZIP filtering.
Extract and verify US addresses embedded in unstructured text, HTML, or documents via a single API call.
Address enrichment API delivering 350+ property data points — structure, location, and financial attributes — for 210M+ US addresses.