Library: GEO 220: Finding GIS Data: Websites by geography

National data and mapping sites

American FactFinder: Census data and more.
Data and Statistics | USA.gov: Federal data and statistics. Find data and statistics by topic.
Data.gov: Portal for federal government statistics
EarthExplorer: from the US Geological Survey.
GeoCommons: GeoCommons is the public community of GeoIQ users who are building an open repository of data and maps for the world.
geo.data.gov
Multi-Resolution Land Cover Characteristics Consortium
National Atlas home page
National Atlas Data Download
The National Map: Download topographical maps and much more
U.S. Board on Geographic Names: search domestic and foreign place names
USGS: Maps, Imagery, and Publications

Data Websites: Pennsylvania: sources of Pennsylvania data from Stanford University Libraries
Delaware Valley Regional Planning Commission: federally designated Metropolitan Planning Organization for a diverse nine-county region in two states: Bucks, Chester, Delaware, Montgomery, and Philadelphia in Pennsylvania; and Burlington, Camden, Gloucester, and Mercer in New Jersey.
Open Data Philadelphia: Access to more than 175 data sets, applications, and APIs related to the Philadelphia region.
Pennsylvania Department of Education
Pennsylvania Geological Survey: Digital Maps, Data, and GIS
Pennsylvania Governmental Agencies
Pennsylvania Spacial Data Access (PASDA): Clearinghouse of data from the state of Pennsylvania created by Penn State University
Pennsylvania State Data Center: from Penn State University
Pennsylvania Uniform Crime Reporting System

CIA World Factbook: Very basic international data and information to familiarize yourself with world nations
GEO-Portal: Browse data resources by societal benefit areas. Provided by European Space Agency
International Data - People and Households: International census data from the U.S. Census Bureau
UNdata
World Bank Data

David Rumsey Historical Map Collection: 35,000 local, regional, national and world maps from the 18th and 19th centuries. Focus on the Americas, but includes maps from around the world.
Historical GIS: Historical GIS data from around the world
National Historical Geographic Information System: downloadable historic data
Perry-Castañeda Library Map Collection - University of Texas Libraries: thousands of historic and current maps from around the world