Thanks for looking at my question.
The 1920 US Census is from Canton, Lincoln, South Dakota, District 131, image 5. Hans Hanssen Foss is married to Thea Hokenstad (married on 16 Jan 1908 in Lincoln, SD). Hans died on 2 Feb 1921 in Canton, Lincoln, SD.
The family information is from one of his sons who did some family tree work in the late 70's. He was unable to locate any family history in Norway, but I think he only explored Elverum, Rendalen, and Trysil. Since those areas came up empty way back then, maybe he will be found if I explore some of the other municipalities.
Appreciate the suggestions. I'll start digging some more.