Clearinghouses and Portals

ArcGIS – Esri Data & Maps
“Get the latest updates to Data & Maps right now by downloading a collection of layer packages through the Data and Maps for ArcGIS Group on ArcGIS Online.” (US Federal Government)
Data, including geospatial, from various US Government agencies

GIS Data Depot
Clearinghouse of USA datasets by state, as well as international data

Libre Map Project
“The purpose of the Libre Map Project is to aggregate and make digital maps and related GIS data available for Free.”

National Atlas
A wide range of GIS data covering the physical and built environment at the national level

North American Atlas (Canada/USA/Mexico)
Bathymetry, glaciers, hydrography, political boundaries, populated places, railroads, roads, sea ice


By State

State GIS Clearinghouses (Univ. of Maryland)
University of Maryland University Libraries put together this list of state GIS websites


Alaska Geospatial Data Clearinghouse (USGS)
US Geological Survey’s list of GIS data sources in Alaska

Alaska State Geo-spatial Data Clearinghouse
The State of Alaska’s state and local government GIS data


Bureau of Land Management GIS Data (Oregon/Washington)
Administrative units, facilities, land status, landscape cover, terrain, water and more

King County GIS Portal (Seattle)
A wide range of GIS datasets covering King County, including the city of Seattle.

Seattle Data Portal (
Seattle’s open data site.  Search “GIS” to see a wide variety of downloadable data.

WSDOT GeoData Distribution Catalog (Washington State Department of Transportation)
Transportation, political, administrative and environmental features in GIS format


By Subject


National Weather Service GIS – AWIPS Shapefile Database
Shapefiles of weather-related and political boundaries, hydrography and cities

NOAA Climate Maps of the United States
In most cases, NCDC’s Climate Maps of the United States are available in two formats, Adobe PDF and/or ESRI Shape Files.”


Commission for Environmental Cooperation
Base maps, terrestrial ecosystems, marine ecosystems, pollution and waste, human influence, and climate data in shapefile or GRID format.  Covers Canada, USA and Mexico.

Publicly available animal, ecology and plant data available for free download


Atlas of Historical County Boundaries
Includes shapefiles of historical boundaries along with histories and documentation.

National Historical Geographic Information System (NHGIS)
NHGIS “…provides, free of charge, aggregate census data and GIS-compatible boundary files for the United States between 1790 and 2000.”

Remote Sensing/Satellite Imagery

Global Visualization Viewer (USGS)
View and download worldwide satellite imagery (requires free account setup)
Download landsat data (only some images are free)

Reverb/ECHO (NASA)
New “metadata and service discovery tool” to find remote sensing and earth science data