Simpson Library: GIS: Websites

U.S. Data Sites

Data.gov
Data sets from the Executive branch of the U.S.
USGS Earth Explorer
American Geographical Society Library
Extensive collection of maps and tools for both U.S. and international geography.
Cartographic Boundary Files
Simplified boundary files from the U.S. Census Bureau's MAF/TIGER database.
more...less...
Available in KML and shapefile format.
DataFinder - U.S. Population Reference Bureau
Information about population, health, and the environment.
Geospatial Data Gateway
from the Natural Resources Conservation Service
NASA Socioeconomic Data and Applications Center (SEDAC)
sponsored by Columbia Univ.
National Map Project
The National Map is a collaborative effort among the USGS and other Federal, State, and local partners to improve and deliver topographic information for the Nation
National Transportation Atlas Data
U.S. Census Bureau
U.S. Criminal Justice data
U.S. data from the ICPSR (U. of Michigan)
U.S. Gazetteer (Census Bureau)
Data for 1990, 2000, 2010.
U.S. Hydrography Dataset
U.S. National Parks GIS Program
Water Resources (USGS)
USGS Data Download

American Geographical Society Library
Extensive collection of maps and tools for both U.S. and international geography.
Google Earth Timelapse
The Perry-Castañeda Library (PCL) Map Collection
The Perry-Castañeda Library (PCL) Map Collection website is archived as of 2021 and no longer being updated
National Map Project (USGS)
Open Street Map
Google Maps
Map Maker Interactive
Free map-making tools from National Geographic
Old Maps Online
from the Univ. of Portsmouth (UK)
World Maps
Univ. of Texas-Austin -- Perry-Castaneda collection
North American Environmental Atlas