About Sanborn Fire Insurance Maps
The Sanborn Map Company published 660,000 fire insurance maps from 1867 to 1970 for 12,000 cities and towns in the United States. These maps were used to determine fire insurance rates. For more information, see the University of California at Berkeley Library, adapted from Fire Insurance Maps in the Library of Congress (Gov Pubs Micro/US LC 5.2:F51). The Sanborn Map Company provides a key to their maps.