The Smart Location Database is a nationwide geographic data resource for measuring location efficiency. It includes more than 90 attributes summarizing characteristics such as housing density, diversity of land use, neighborhood design, destination accessibility, transit service, employment, and demographics. Most attributes are available for every census block group in the United States. EPA first released the Smart Location Database in 2011 and released version 2.0 in July 2013. Please review the Smart Location Database Technical Documentation and User Guide (PDF) (52pp, 2MB). for a full description of all available variables, data sources, data currency, and known limitations.