In 1850, the Thornton's were living in Cold Spring, Putnam, New York. John was employed as a labourer.
POB: Irish Free State. Source: 1930 US Census for son John P. Thornton. 
↑ "United States Census, 1850," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MC14-48Z : 12 April 2016), John Thornton, Cold Spring, Putnam, New York, United States; citing family 81, NARA microfilm publication M432 (Washington, D.C.: National Archives and Records Administration, n.d.) Affiliate Film #581 GS Film #444297 Digital Folder #004203134 Image #00185
↑ "United States Census, 1930," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:X7HY-1NT : accessed 20 August 2018), John P Thornton, Plattsburgh, Clinton, New York, United States; citing enumeration district (ED) ED 33, sheet 9B, line 85, family 202, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 1417; FHL microfilm 2,341,152.