The Constitution requires a census. Fine: three people live here.
The Constitution also requires a warrant for any details beyond simple geographic enumeration. Fine: you want to know how many toilets are in my house*, ask a judge to sign a warrant.
(* - one of the many pointlessly detailed questions asked in the last census, with threat of a fine if not answered. The threat was eventually rescinded.)
do out houses count?
We got ours and it’s in the outgoing mail today. It is nowhere near as invasive as the 2000 census (on which we only recorded number of residents). It merely asked for number of residents, and the name/age/sex/race of said residents. Except for race, these are the same things recorded about my immigrant ancestors. So we filled it out for posterity. :)