Dearborn was born about 1811. He passed away about 1885.
Sources
Ancestry.com.
Find a Grave, database and images (https://www.findagrave.com/memorial/114761040/dearborn-mathewson: accessed 19 June 2023), memorial page for Dearborn Mathewson (27 Mar 1811–30 Apr 1885), Find a Grave Memorial ID 114761040, citing Mount Clark Cemetery, Central City, Linn County, Iowa, USA; Maintained by CJeanealogy (contributor 47474846).
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