David was born about 1848. He passed away in 1912.
Sources
"United States Census, 1850," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MC1Z-GYX : 12 April 2016), David H Agan in household of Patrick J Agan, Brunswick, Rensselaer, New York, United States; citing family 97, NARA microfilm publication M432 (Washington, D.C.: National Archives and Records Administration, n.d.).
"New York State Census, 1855," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:K63C-LYB : 13 March 2018), David H Agan in household of Joseph Agan, E.D. 1, Brunswick, Rensselaer, New York, United States; citing p. 5, line #29, family #41, county clerk offices, New York; FHL microfilm 549,886.
"New York State Census, 1865," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:QVNN-S77V : accessed 4 January 2019), David H Agan in household of Joseph Agan, District 01, Brunswick, Rensselaer, New York, United States; citing source p. 51, line 39, household ID 387, county clerk, board of supervisors and surrogate court offices from various counties. Utica and East Hampton Public Libraries, New York; FHL microfilm 549,892.
"New York State Census, 1865," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:QVNN-S7HV : accessed 4 January 2019), David H Agan in household of Joseph Agan, District 01, Brunswick, Rensselaer, New York, United States; citing source p. 51, line 39, household ID 387, county clerk, board of supervisors and surrogate court offices from various counties. Utica and East Hampton Public Libraries, New York; FHL microfilm 549,892.
"United States Census, 1870," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M8JV-FHT : 12 April 2016), David H Agan in household of Joseph Agan, New York, United States; citing p. 243, family 2099, NARA microfilm publication M593 (Washington D.C.: National Archives and Records Administration, n.d.); FHL microfilm 552,402.
"United States Census, 1880," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MZD5-KKN : 17 August 2017), David H Agan, New York, New York, New York, United States; citing enumeration district ED 56, sheet 451C, NARA microfilm publication T9 (Washington D.C.: National Archives and Records Administration, n.d.), roll 0869; FHL microfilm 1,254,869.
"New York, New York City Marriage Records, 1829-1940," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:24HR-7SC : 10 February 2018), David Agan and Jennie Howath, 29 Jun 1892; citing Marriage, Manhattan, New York, New York, United States, New York City Municipal Archives, New York; FHL microfilm 1,452,288.
"New York Marriages, 1686-1980," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:F644-GXN : 10 February 2018), David H. Agan and Jennie Mohessy Howath, 29 Jun 1892; citing reference ; FHL microfilm 1,452,288.
"United States Census, 1900," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MSK2-ZTS : accessed 4 January 2019), David H Agan, Borough of Manhattan, Election District 16 New York City Ward 29, New York County, New York, United States; citing enumeration district (ED) 786, sheet 7B, family 113, NARA microfilm publication T623 (Washington, D.C.: National Archives and Records Administration, 1972.); FHL microfilm 1,241,116.
"New York State Census, 1905," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:SPF1-2YB : 20 July 2018), David H Agan, Manhattan, A.D. 29, E.D. 16, New York, New York; citing p. 4, line 10, various county clerk offices, New York; FHL microfilm 1,433,110.
"United States Census, 1910," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M58N-ZMP : accessed 4 January 2019), David H Agan, Manhattan Ward 19, New York, New York, United States; citing enumeration district (ED) ED 1144, sheet 12A, family , NARA microfilm publication T624 (Washington D.C.: National Archives and Records Administration, 1982), roll 1042; FHL microfilm 1,375,055.
"New York, New York City Municipal Deaths, 1795-1949," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:2WYN-W9Z : 10 February 2018), David Henry Agan, 06 Nov 1912; citing Death, Manhattan, New York, New York, United States, New York Municipal Archives, New York; FHL microfilm 1,323,316.
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