Old House Online: Sanborn Fire MapsA number of universities and public libraries in the U.S. have digitized and made available open access local collections of Sanborn Maps. Not all content posted at the listed institutions is fully downloadable, but they have all made an effort to provide access to the Sanborn Maps relevant to their geographic location. Some content MAY be open access. Go to the institution website to enquire.
These institutions include but are not exclusive to: The Library of Congress, The University of Alabama, San Jose Public Library, University of Colorado Digital Library, University of Florida Library, Digital Library of Georgia, IU-PUI University Library, SF Genealogy, Ball State University, University of Kansas, Kentuckiana Digital Library, David Rumsey Map Collection, University of Missouri, Washington University (St. Louis), University of Nevada (Reno), Princeton University Library, Dartmouth College Library (New Hampshire), University of North Carolina at Chapel Hill, the Public Library of Cincinnati and Hamilton County, Toledo's Attic, Pennsylvania State University Libraries, University of Texas Libraries, University of South Carolina Library, University of Utah Library, UW Milwaukee (AGS Library), Wisconsin Historial Society.