The 1940 census finds Santa Claus still living in Marshall, Saline County Missouri (ED 98-21). Santa is working as a sewer worker. There is no 1940 agricultural census to determine if Santa had any reindeer or not.
Seriously though, I never noticed that there is a box on the 1940 census to check if the entry is continued on the next page. I'm not certain I ever noticed it before as always look at the next page whenever I find any census entry.