The Ohio Sanborn Maps are available at OSU in several formats.
The most popular is the Digital Sanborn Maps covering the years 1867-1970.
Ohio microform copies are available from the late 19th Century to 1989 in the OSU Library system.
Print copies of the Sanborn maps for Columbus, 1967-1971 are in the OSU Architecture Library.
Cincinnati Sanborn Maps for 1904-1930 are available at the Public Library of Cincinnati & Hamilton County Virtual Library Digital Maps.
The Sanborn Maps were originally created for assessing fire insurance liability in urbanized areas in the United States. The maps include detailed information regarding town and building information in approximately 12,000 U.S. towns and cities from 1867 to 2007.
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.
To date, over 6000 sheets are online in the following states: AK, AL, AZ, CA, CT, DC, GA, IL, IN, KY, LA, MA, MD, ME, MI, MO, MS, NC, NE, NH, NJ, NV, OH, PA, TX, VA, VT, WY and Canada, Mexico, Cuba sugar warehouses, and U.S. whiskey warehouses.