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Maps - US
Links to general, historical and topographic maps and other raster maps as well as interactive atlases.
WMS links for use with Esri ArcGIS or Google Earth
The following links will provide instructions on how to connect to that Agency's Web Mapping Service while using Esri's ArcGIS software or for Google Earth.
GIS Data - Nation-wide GIS Clearinghouses
Sources for national and international geospatial data
Census Data website
This site is optimized for use with the Chrome browser.
Newest version for finding US Census data. This is the replacement for American Factfinder.
A large selection of vector map files and demographic data files
A cross-agency collaborative effort with a primary role which is to discover geospatial data assets with special emphasis as the authorized source for all the official National Geospatial Data Assets (NGDAs) across 18 Data themes.
The ArcGIS Hub site has been created by Esri to provide federally focused data of interest. There are hundreds of layers of authoritative data available for easy downloading.
National Historical Geographic Information System
Education data and GIS files. From the same people that created the NHGIS site.
Geo data can be found under the Data tab
Main link to EROS Data Center
Land cover, elevation, air photos, satellite imagery can be found here.
Link to USGS's Earth Explorer
US County Boundaries 1783-2000
Vector files for US counties from 1783-2000 from the Newberry Library.
CDC - vector maps and data
Epi Map module displays geographic maps with data from Epi Info
EPA - Envirofacts
Find general environmental information about a specific company or place.
EPA - Watershed maps
Search for data and maps about watershed and their sub-areas
FEMA Mapping Information Platform
A map viewer for FEMA flood Zone maps
FEMA Map Service
Locate and download FEMA maps for any community in the US
Interactive mapping tool that also allows downloading of maps in .SHP file format for use in ArcGIS.