From Wikipedia: Sanborn maps are detailed maps of U.S. cities and towns in the 19th and 20th centuries. Originally published by The Sanborn Map Company, the maps were created to allow fire insurance companies to assess their total liability in urbanized areas of the United States. Since they contain detailed information about properties and individual buildings in approximately 12,000 U.S. cities and towns, Sanborn maps are valuable for documenting changes in the building environment of American cities over many decades.
Sanborn held a monopoly over fire insurance maps for the majority of the 20th century, but the business declined as US insurance companies stopped using maps for underwriting in the 1960s. The last Sanborn fire maps were published on microfilm in 1977, but old Sanborn maps remain useful for historical research.
From the Library of Congress: The Sanborn Fire Insurance Maps Online Checklist provides a searchable database of the fire insurance maps published by the Sanborn Map Company housed in the collections of the Geography and Map Division. The online checklist is based upon the Library’s 1981 publication Fire Insurance Maps in the Library of Congress and will be continually updated to reflect new acquisitions.
The online checklist also contains links to existing digital images from our collection and will be updated as new images are added. If you have any questions, comments, or are interested in obtaining reproductions from the collection, please Ask A Librarian.
The Sanborn maps are arranged by state, then city and release data. Currently there are over 25,000 sheets from over 3000 city sets online in the following states: AK, AL, AZ, CA, CO, CT, DC, DE, GA, ID, IL, IN, KY, LA, MA, MD, ME, MI, MO, MS, NC, ND, NE, NH, NJ, NV, OH, OK, PA, SD, TX, VA, VT, WY and Canada, Mexico, Cuba sugar warehouses, and U.S. whiskey warehouses.
Click here to go to the Sanborn Fire Insurance Map Collection at the Library of Congress (Additional and higher resolution versions are available for downloading)
Click here to read more about the Sanborn Fire Insurance Maps on Wikipedia
Nebraska City – September 1883
Nebraska City – September 1888 – 1 
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Nebraska City – April 1888
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Nebraska City – May 1891
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Nebraska City – June 1899
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Syracuse – April 1900
Syracuse – April 1900 – 1 
Syracuse – April 1900 – 2
Talmage – April 1900
Talmage – April 1900
Nebraska City – May 1906
Nebraska City – May 1906 – 1 
Nebraska City – May 1906 – 2 
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Syracuse – January 1913
Syracuse – January 1913 – 1 
Syracuse – January 1913 – 2
Nebraska City – February 1913
Nebraska City – February 1913 – 1 
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Talmage – June 1913
Talmage – June 1913 – 1 
Talmage – June 1913 – 2
Syracuse – January 1939
Syracuse – January 1939 – 1 
Syracuse – January 1939 – 2 
Syracuse – January 1939 – 3 
Syracuse – January 1939 – 4