Its not the US census. From the official U.S. census website: How
The Census Bureau will mail or deliver questionnaires to your house in March 2010. We will mail a second form to households that do not respond to the initial questionnaire.
Households that still do not respond will be called or visited by a Census worker. (Census workers can be identified by a census badge and bag.)
Now, there is the clever subterfuge of the American Community Survey which is purposely not called a census and is sent to a "sampling" of US homes such that each home receives one not more than once every five years. Its what they used to call the long form as the 2010 census will only contain the short form. If your would like to see the questions on the US American Community Survey you can look at them here in pdf format:
[link to www.census.gov
Questions like: How much do you make? How many days of work have you missed in the last week? How big is your house? How much is your mortgage payment? How many bedrooms does your house have? How many cars do you have? How much is your house worth? Do you have a second mortgage? What is the main reason you are staying in you house? What is your education level? When did you come the United States? What is your ancestry or ethnic origin? Where did you live one year ago? How many years of active military service have you had? How many minutes does it take you to get to work? Who do you work for? What were your most important work activities or duties?
And if you think that's bad you should see the Department of Commerce business census or the Department of Agricutlure Census. They want it all. You see through clever subterfuge they have circumvented the constitution. Now every five years under penalty of law every household and business and farm has to provide the government with a detailed listing of ALL information.
The business survey asks about your customers, your employees, your expenses, how much you made, the farm survey requires you to list every crop, virtually every detail of your farm or business activity, they are both about 20 pages long in like 8 pt type.
Personally I think they are getting ready for something like siezure of assets and they want to construct a prioritized list.