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Sanborn Fire Insurance Maps

Created by the Sanborn Map Company, these detailed maps were primarily used for fire insurance purposes.

Sanborn Fire Insurance Maps at Library of Congress
The Sanborn map collection consists of a uniform series of large-scale maps beginning in from 1867 and depicting the commercial, industrial, and residential sections of some twelve thousand cities and towns in the United States, Canada, and Mexico.
Sanborn Fire Insurance Maps at Penn State
Penn State University Maps Library has a near complete collection of Sanborn Fire Insurance maps for the state of Pennsylvania. This digital collection is arranged by city name.
Sanborn Fire Insurance Maps Online Checklist
A searchable database of the fire insurance maps published by the Sanborn Map Company housed in the collections of the Geography and Map Division.