American Memory Project
Library of Congress online map collections.
The CIA Maps series has now gone online only. Search by location or publication.
Dictionary of Abbreviations and Acronyms in GIS, Cartography, and Remote Sensing
Decodes abbreviations and acronyms found in various publications including maps and websites.
Use EPA spatial data at national, state, and county levels.
GNIS - Geographic Names Information System (U.S. Board on Geographic Names)
USGS database of almost 2 million physical and cultural geographic features in the United States.
Map History / History of Cartography: THE Gateway to the Subject
Organized collection of links with index and sitemap available for navigation.
Maps and Geoscience - Community Guides
Useful guides from the USGS and others.
The National Map: Small-Scale Data
Connect to National Atlas 1997-2014 edition printable maps and datasets, small-scale datasets, and dynamic topographic maps.
National Geographic MapMaker Interactive
NHGIS - National Historical Geographic Information System
Sponsored by the Minnesota Population Center, this site provides free, aggregate census data and GIS-compatible boundary files for the U.S. from 1790 to 2000.
New Hampshire statewide geographic information system.
Old Maps Online
Gateway to historical maps in libraries around the world. Collaboration between the Great Britain Historical GIS Project, of the University of Portsmouth, and Klokan Technologies GmbH, based in Switzerland.
Library of Congress collection of panoramic maps.
Place Names (from ASU Library Guide for Geographical Sciences)
Links to GNIS, US Gazetteer, and specific place name sites by state or country.
David Rumsey Collection
Extensive historical map collection.
Union List of Sanborn & Other Fire Insurance Maps
The UC Berkeley Earth Sciences and Map Library has a Union List of Sanborn and Other Fire Insurance Maps that indicates both owning institutions and maps that are available online.
Getty Thesaurus of Geographic Names Online
United Nations Geospatial Information Section
Two primary map collections, general and mission, available in PDF format.
US Census Bureau - Geography Program
Source for mapping files, reference maps, and reference files.