The 1870 census for Andover, NH, has the 15-year-old Frank working as a farm hand in the household of Oscar and Lucy Eastman.
Frank Sylvester Bartlett married Carrie Minerva Emerson on July 4, 1875 in Andover NH. Eastman: History of Andover NH (online at openlibrary.org). Apparently no children were born to Frank and Carrie (census 1900 & 1910, family records).
Frank can be found in the US Censuses until 1930. One the picture scans of an August, 1938 Bartlett reunion has Frank in it.
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