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Dear Mr. Hoyler,
Thank you for posting your request on History Hub!
Daniel Alfred Sanborn was born in 1827 and did not begin creating fire insurance maps until 1866. He founded his own firm in 1867.
The Library of Congress has a large collection of Sanborn Maps. 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 Library of Congress’s Geography and Map Division.
Also, the web pages Sanborn Fire Insurance Maps: Finding Sanborn Maps Online and Sanborn Fire Insurance Maps: Collections in US from University of Buffalo University Libraries list additional resources.
We hope this is helpful. Best of luck with your research!