The home of the U.S. Government’s open data. Here you will find data, tools, and resources to conduct research, develop web and mobile applications, design data visualizations, and more.
Managed by the National Geospatial Program (NGP), The National Map Viewer provides visualization and download of all eight primary themes of The National Map data sets, including US Topo elevation data sets and historical topographic map products.
"PolicyMap is an online data and mapping tool that enables government, healthcare, non-profit, and academic institutions to access exclusive, proprietary and gold-standard public indicators about communities across the U.S"
Boundaries from 1990-2018 including:
States
Tribal Lands
Congressional Districts
County
County Within Congressional Districts
Divisions
Metropolitan and Micropolitan Statistical Areas
Urban Areas
Zipcodes
