Anyone know where I can get information on what information I am required to provide and what I am not?
Hmm. As I recall, the Constitution only requires the number of folks living in your house for the purposes of apportionment. I received a hideously long form, pages and pages. It was hideous in the number of unconstitutional questions that were asked (bathrooms etc.).
During the last census, my German manservant was the only one home when the census worker showed up on a followup (we were on holiday in the south of Australia at the time). He was playing on the floor with my young son, and was sitting there in this underwear. Rather embarrassing as there is a window next to the door, and the census worker was peeking through it to see if anyone was home (jerk).
He dressed, and answered the door. He was immediately bombarded with a number of questions that had nothing to do with apportionment, and why only the questions regarding the number of people living in the house were the ones that were answered. To his credit, he stated that he was sure that we had answered everything that we felt was constitutionally appropriate (clever Kraut, that one).
Beyond what was returned on the mailed questionnaire, he stated that he was not at liberty to provide further information. This really torqued the census person off, and she went to six different houses in the neighborhood, asking questions about the people that lived at our address, before she gave up and went away.
Annoying lot, those census workers.