Free Old Maps Online, Online Map Collections, Old Highway Maps, Free Historical Maps Online, Train map of America, David Rumsey map center, Panoramic map, American history map, Historic Town Atlas, US Census Atlas. All free online.
Census Atlas of the United States
Containing almost 800 maps. Data from decennial censuses prior to 2000 support nearly 150 maps and figures, providing context and an historical perspective.
Great Lakes Maps, Atlases & Map Collections
For the Great Lakes region, at “History of the Great Lakes States”.
Historical Atlases and Maps of U.S. and States
Contains rotating animated maps showing county boundary changes. Past and present maps of US are overlaid so that you can see the changes in county boundaries, downloadable County D.O.T. Maps, and state atlas maps.
Historical Maps Online
Maps charting the last 400 years of historical development in Illinois and the Northwest Territory. 420 items. Univ. of Illinois at Urbana-Champaign.
Illinois Maps, Map Collections & Gazetteers
At “History of the Great Lakes States”.
Indiana Maps, Map Collections & Gazetteers
At “History of the Great Lakes States”.
Iowa Counties Historic Atlases
The University of Iowa Libraries
USGS Maps for 50 U.S. States
Sets of USGS maps for every state. 60,000 maps in all. Internet Archive.
Lewis & Clark Expedition Maps
86 hand-drawn maps by members of the expedition. Beinecke Rare Book & Manuscript Library, Yale University.
Maps of American Westward Migration
63 maps, mostly of Mormon migration in the mid-19th century. Mountain West Digital Library.
Maps of Railroads in the U.S.
Maps of Railroads in the Western U.S.
51 items at the first link, and 32 in the second, mostly from the 19th Century. Beinecke Library, Yale University.
Michigan Maps, Map Collections & Gazetteers
At “History of the Great Lakes States”.
Ohio Maps, Atlases & Map Collections
At “History of the Great Lakes States”.
Panoramic Maps of Cities and Towns, 1800-1899
Library of Congress sub-collection
Railroad Maps, 1828-1900
623 maps. Railroad maps and regional, state, and county maps showing “internal improvements” of the past century. Library of Congress.
Road Maps of New England, ca. 1925
From the Automobile Green Book, published by an auto association.
Sanborn Maps at Library of Congress
The Sanborn maps are detailed maps of cities produced by fire insurance companies. This collection has over 25,000 sheets from over 3000 city sets in about 35 U.S. states, and Canada and Mexico. Library of Congress.
U.S. National Parks and Monuments Maps
The Perry-Castaneda collection at University of Texas at Austin Libraries.
United States Historical City Maps – Perry-Castaneda Map Collection
University of Texas at Austin Libraries
United States Historical Maps at the Perry-Castaneda Map Collection
University of Texas at Austin Libraries
Wisconsin Maps, Map Collections & Gazetteers
At “History of the Great Lakes States”.