The World Factbook provides information on the history, people, government, economy, geography, communications, transportation, military, and transnational issues for 266 world entities. A generalized map of the country/entity is also provided. The World Factbook also includes: maps of the major world regions, as well as Flags of the World, a Physical Map of the World, a Political Map of the World, and a Standard Time Zones of the World map.

Coverage: World; Current
Tags: Economics, Geography, Government

WorldImages “contains approximately 100,000 images, is global in coverage and includes all areas of visual imagery. WorldImages is accessible anywhere and its images can be freely used for non-profit educational purposes. . . . The images can be located using many search techniques, and for convenience they are organized into over 900 portfolios.”

Tags: Geography

The Geospatial Data Gateway (GDG) is the One Stop Source for environmental and natural resources data. The Gateway allows you to choose your area of interest, browse and select data from our catalog, customize the format, and have it downloaded or shipped on CD or DVD. Data sets include: Common Land Units, Transportation, Government Units, Census, Landmarks, Digital Raster Graphics (DRG), Elevation, Ortho Imagery, Landuse/Landcover, Geology, Soils, Precipitation, Temperature

Coverage: United States; Current
Tags: Geography

The 1990 and 2000 decennial census boundary files available here are selected generalized extracts from the Census Bureau’s TIGER geographic database and are designed for use in a Geographic Information System (GIS) or similar mapping system. The cartographic boundary files on this site are available in ARC/INFO EXPORT (.e00) format, ArcView Shapefile (.shp) format, and ARC/INFO Ungenerate (ASCII) format. These are the boundary files without the demographic data in the attribute tables. Tabular data may be downloaded from American Factfinder ( and used in conjunction with the boundary files.

Coverage: United States; 1990, 2000
Tags: Geographic Information Systems (Gis), Geography

The National Historical Geographic Information System (NHGIS) is a project to create and freely disseminate a database incorporating all available aggregate census information for the United States between 1790 and 2000. Census Tract Shapefiles are available for select areas for the 1940 – 1990 census.The NHGIS consists of three major components: 1)Collect and enrich historical and contemporary U.S. Census summary data; 2)Incorporate these data into a Geographic Information Systems framework; 3) Create a web-based system for access to both census data and the metadata. Free access, but requires you to register and login to use.

Coverage: United States; 1790 - 2011
Tags: Census, Geography, History, Medicine