Question: are you legally required to answer the census?
Answer: The census provides the only official head count. ... According to United States Code, Title 13 (Census), Chapter 7 (Offenses and Penalties), SubChapter II, if you're over 18 and refuse to answer all or part of the census, you can be fined up to $100. If you give false answers, you're subject to a fine of up to $500.