ATTOM Data Solutions blends property tax, deed, mortgage, foreclosure, environmental risk, natural hazard, and neighborhood data for more than 155 million U.S. residential and commercial properties multi-sourced from more than 3,000 U.S. counties. A rigorous data management process involving more than 20 steps validates, standardizes and enhances the data collected by ATTOM, assigning each property record with a persistent, unique ID . The 9TB ATTOM data warehouse powers real estate transparency for innovators, entrepreneurs, disrupters, developers, marketers, policymakers, and analysts through flexible delivery solutions, including bulk file licenses, APIs and customized reports.