Contains a variety of economic, climate, consumer, and geospatial data.

Offers a collection of small-scale data sets on health, environmental, transportation, and agriculture topics.

Download data on any country in the word: administrative boundaries, roads, railroads, altitudes, land cover, population density.

Includes a variety of data on different topics.

Public domain, vector and raster data.

GIS data of all 50 states and boundaries.

Free aggregate census data and GIS-compatible boundary files for the United States between 1790 and 2010.

This website contains background information and links to projects and databases.

Access public environmental data.

Provides global GIS Data on terrestrial, freshwater, and marine ecoregions.

U.S Fish & Wildlife GIS data.

Contains spatial data on natural disasters.

Provides downloadable public-use data files on surveys and studies.

Allows users to access to health care data.

Contains cancer-related data.

This archive program acquires, preserves, and disseminates data relevant to drug addiction and HIV research.

Data on global health and mortality.

Access environmental and historical data on Illinois.

Contains GIS data, projects, and products related to the Illinois State Water Survey.

Access Illinois GIS data sets and documentation (metadata) for ArcIMS Interactive Map Services, USGS digital topographic maps, aerial photography, orthoimagery, orthophotography, geology, land use, natural resources, and infrastructure. Illinois data sets and map data layers are available for download free of charge.

This site contains administrative boundary information.