1940 Census has "uncle Jack" and aunt Doris living on the "XO Ranch" west of Onida, SD. Soon after that he got a job at the Onida Grain Elevator and they moved into town.
"United States Census, 1940," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:V1SS-65S : accessed 12 August 2017), Rodney J Clark, Township 115 Range 78, Sully, South Dakota, United States; citing enumeration district (ED) 60-24, sheet 1A, line 36, family 11, Sixteenth Census of the United States, 1940, NARA digital publication T627. Records of the Bureau of the Census, 1790 - 2007, RG 29. Washington, D.C.: National Archives and Records Administration, 2012, roll 3868.
SD 1945 Census:
"South Dakota State Census, 1945," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MLB2-6JH : 3 August 2017), R J Clark, Hartford, Sully, South Dakota; citing p. 935, State Historical Society, Pierre; FHL microfilm 2,370,948.
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