"United States Census, 1850," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MCY3-K66 : accessed 19 July 2015), Charles Swart, Middletown, Delaware, New York, United States; citing family , 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:K63Y-BXS : accessed 19 July 2015), Charles Swart in household of Samuel Swart, E.D. 1, Middletown, Delaware, New York, United States; count clerk offices, New York; FHL microfilm 832,847.