Coverage: 16th Century to present
Open access collection of historical map images; over 75,000 and growing. Maps covering nearly every corner of the world, dating from the 16th century to the present.
Digital map images from the Library’s Geography & Maps Division, organized by subjects and themes, primarily of the United States. Maps range from local to national scales and include panoramic bird’s-eye view maps of many cities from the mid-19th to early 20th century.
Data on the geography, demography, government, economics, etc. for every country in the world (courtesy of the CIA).
Coverage: 15th Century to present
Penn State’s digital map collection is particularly rich in Pennsylvania maps, but many other regions of the world are also represented. Especially notable is a nearly complete collection of out-of-copyright Sanborn Fire Insurance maps for Pennsylvania. High resolution digital color images of these maps are available for download.
Historical charts from the U.S. Coast and Geodetic Survey. This collection also includes other images from the archives of the USCGS which date back to the 18th century.
Interactive, online mapping service from the U.S. Geological Survey. Create customized topographic maps reflecting elevation, geology, land use, natural hazards, and other features.
Online viewer and download center for nautical charts from the National Oceanographic and Atmospheric Administration (NOAA).
The NYPL's tool for "digitally aligning ("rectifying") historical maps from the NYPL's collections to match today's precise maps," accompanied by many previously aligned maps of New York City.
The Boston Public Library's online map collection. Includes maps from the American Revolutionary War, the European age of discoveries, and Colonial New England and Boston.
Gateway to historical maps digitized by major map libraries in Europe and the U.S.
Over 2000 scanned maps from the University of Texas at Austin, plus links to many external online maps, including "maps of current interest".
Digitized maps of towns or cities in Pennsylvania originally created for use by fire insurance companies. Maps are drawn to a scale of 50 feet to an inch; list street blocks and building numbers; and are coded for building materials used. For color versions of those maps, see the collection hosted by Penn State's map library. For Sanborn Maps in areas other than Pennsylvania, see Sanborn Maps from the Library of Congress.
Political, physical, and locator maps for countries of the world. From Oxford Reference Online.