"United States Census, 1850," index and images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MXS5-2Y9 : accessed 14 April 2015), Ezra G Leonard in household of Jared Leonard, Harpersfield, Ashtabula, Ohio, United States; citing family 412, NARA microfilm publication M432 (Washington, D.C.: National Archives and Records Administration, n.d.).
"Ohio, County Marriages, 1789-2013," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:XD4W-S5T : 10 December 2017), I. F. Leonard and Nancy A. Bisbee, 31 Mar 1858; citing Ashtabula, Ohio, United States, reference 314; county courthouses, Ohio; FHL microfilm 890,265.
"United States Census, 1860," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:MCP9-LGT : accessed 21 September 2015), Isaac Leonard, Ashtabula Township, Ashtabula, Ohio, United States; from "1860 U.S. Federal Census - Population," database, Fold3.com (http://www.fold3.com : n.d.); citing p. 46, household ID 366, NARA microfilm publication M653 (Washington, D.C.: National Archives and Records Administration, n.d.); FHL microfilm 803,932.
"United States Census, 1870," Database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MHCV-GGG : accessed 23 June 2015), Nancy Leonard in household of Iasac Leonard, Michigan, United States; citing p. 4, family 32, NARA microfilm publication M593 (Washington D.C.: National Archives and Records Administration, n.d.); FHL microfilm 552,204.
"United States Census, 1880," Database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MW3N-6BT : accessed 23 June 2015), Nancy Ann Leonard in household of Isaac Leonard, Denmark, Tuscola, Michigan, United States; citing enumeration district 399, sheet 88A, NARA microfilm publication T9 (Washington D.C.: National Archives and Records Administration, n.d.), roll 0607; FHL microfilm 1,254,607.
"United States Census, 1910," Database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MLTW-W8Q : accessed 23 June 2015), Nancy A Leonard in household of Isac F Leonard, Tuscola, Tuscola, Michigan, United States; citing enumeration district (ED) 128, sheet 13A, family 237, NARA microfilm publication T624 (Washington, D.C.: National Archives and Records Administration, n.d.); FHL microfilm 1,374,689.
"United States Census, 1920," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MZ7F-5N9 : accessed 4 September 2018), Isaac F Leonard, Tuscola, Tuscola, Michigan, United States; citing ED 196, sheet 11A, line 49, family 241, NARA microfilm publication T625 (Washington D.C.: National Archives and Records Administration, 1992), roll 798; FHL microfilm 1,820,798.
"Michigan Death Certificates, 1921-1952," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:KF7N-83S : accessed 21 September 2015), Isaac F Leonard, 17 Mar 1922; citing Tuscola, Tuscola, Michigan, United States, Division for Vital Records and Health Statistics, Lansing; FHL microfilm 1,973,112.
Find A Grave: Burial: Riverside Cemetery, Vassar, Tuscola County, Michigan, USA, Plot: Block I, Section 3, Created by: Joann Geybels, Record added: Aug 24, 2012, Find A Grave Memorial# 95868658
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DNA Connections
It may be possible to confirm family relationships with Isaac by comparing test results with other carriers of his Y-chromosome or his mother's mitochondrial DNA.
However, there are no known yDNA or mtDNA test-takers in his direct paternal or maternal line.
It is likely that these autosomal DNA test-takers will share some percentage of DNA with Isaac: