data.gov

Here you will find data, tools, and resources to conduct research, develop web and mobile applications, design data visualizations, and more.

IPUMS NHGIS

The National Historical Geographic Information System (NHGIS) provides easy access to summary tables and time series of population, housing, agriculture, and economic data, along with GIS-compatible mapping files, for years from 1790 through the present and for all levels of U.S. census geography, including states, counties, tracts, and blocks.

ArcGIS Open Data 

ArcGIS Hub is an easy-to-configure cloud platform that organizes people, data, and tools to accomplish Initiatives and goals.

OpenGeoportal 

Open data from Tufts University

Census TIGER 

Contains geographic entity codes that can be linked to the Census Bureau’s demographic data.

USDA-NRSC: Geospatial Gateway 

The Geospatial Data Gateway (GDG) provides access to a map library of over 100 high resolution vector and raster layers in the Geospatial Data Warehouse. It is the One Stop Source for environmental and natural resources data

USGS: Earth Explorer 

U.S. Geological Survey data

EPA's Geospatial Data Download 

These files are a part of the EPA Geospatial Data Access Project

Geofabrik Open Street Map Weekly Extracts 

This server has data extracts from the OpenStreetMap project which are normally updated every day.  (Global in scope.)

WorldClim

Provides average monthly climate data for minimum, mean, and maximum temperature and for precipitation for 1970-2000.