I believe this David, who married Mary Carmon and Amelia Newhart, was not the son of Robert and Mary Mills Johnson. Their David was married to Anna Rogers. (https://www.familysearch.org/ark:/61903/3:1:33S7-9PK4-3RRN?i=190&cc=1307272&personaUrl=%2Fark%3A%2F61903%2F1%3A1%3AX84C-YYF)
A profile on Ancestry.com indicated David's parents were Thomas W. Johnson and Nancy Valentine but I didn't see anything that linked this David with them.
This Find a Grave profile matches the birth and death dates but the spouse does not (https://www.findagrave.com/memorial/191347466/david-franklin-johnson).
"Ohio Marriages, 1800-1958", database, FamilySearch (https://familysearch.org/ark:/61903/1:1:XDNC-LQ2 : 25 March 2020), David Johnson, 1880.
Ohio, Marriages, 1800-1958," database, FamilySearch (https://www.familysearch.org), Johnson-Newhart; citing the International Genealogical Index, Salt Lake City.
"United States Census, 1900," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MMXF-PRN : 22 January 2015), David Johnson, Warwick Township Tuscarawas town, Tuscarawas, Ohio, United States; citing sheet 13B, family 250, NARA microfilm publication T623 (Washington, D.C.: National Archives and Records Administration, n.d.); FHL microfilm 1,241,327.
"United States Census, 1910," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:ML8C-KZR : 29 October 2015), David Johnson, Warwick, Tuscarawas, Ohio, United States; citing enumeration district (ED) ED 152, sheet 2B, NARA microfilm publication T624 (Washington, D.C.: National Archives and Records Administration, n.d.); FHL microfilm 1,375,250.
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Featured National Park champion connections: David is 18 degrees from Theodore Roosevelt, 23 degrees from Stephanus Johannes Paulus Kruger, 19 degrees from George Catlin, 14 degrees from Marjory Douglas, 23 degrees from Sueko Embrey, 20 degrees from George Grinnell, 28 degrees from Anton Kröller, 17 degrees from Stephen Mather, 25 degrees from Kara McKean, 18 degrees from John Muir, 20 degrees from Victoria Hanover and 24 degrees from Charles Young on our single family tree. Login to find your connection.