International

• Canada Geological Survey download datasets and maps
• Center for International Earth Science Information Network (CIESIN) a large collection of interactive applications for all over the world
• DESCARTES Intelligent Mapping and Visual Data Exploration for Europe and Germany
• Digital Chart of the World datasets from all over the world from the Penn State University

National and State

• Census Bureau Map Browser interactive mapping application that uses census data
• Demographic Data Viewer  an outstanding, web based GIS applet (If you need to print your map, use the NON-Java version)
• Environmental Conservation Online System (U.S. Fish and Wildlife)to obtain data on endangered species, contaminants, habitats
• EPA - Maps on Demand extensive database to create maps from
• ESRI ArcDATA Quick Map find and map a location
• InfoRain - Interrain Pacific Mapping interactive mapping application and data distribution for Pacific North-West rainforest
• Map Quest - Interactive atlas locate and map a place
• Montana Interactive Mapping System interactive map
• The National Atlas of the United States variety of datasets for download
• National Climatic Data Center temperature and climate data archives
• West Virginia - Interactive Mapping produce maps from a variety of datasets
• Check this site for a list of interactive mapping sites

Pennsylvania

• Erie County Digital Mapping from PASDA
• DEP Facility Analysis System select and display sub-facilities the actual location(s) where a PADEP regulated activity takes place
• Online Drainage Basin Mapping from PASDA
• Pennsylvania Technology Atlas to map utility, cable, phone lines and tele-communications infastructure (PASDA)