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Census TIGER ShapefilesTIGER Line files for legal and statistical areas in shapefile format, updated annually
US Census Cartographic Boundary FilesGeneralized extracts of the bureau's TIGER Line files for several administrative, legal, and census areas in the US
National Historical Geographic Information SystemHistorical census boundaries and data for the US from 1790 to 2010present. New users must register, but there is no cost and downloads are free
National Land Cover DatabaseLand use and land cover data for the entire US
USGS National Map ViewerDownload imagery, elevation data, land cover, and some boundary files via the USGS' web mapping interface
PRISM Climate GroupDaily, monthly, and annual climate rasters with temperature and precipitation data for the US
Libre Map ProjectTopographic Historic topographic maps (DRGs) for the entire US

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