Census Day is set for April 1, and that’s a key reference date for the 2020 Census. Onto those questions you might have:What are the ways I can respond to the Census? To answer the first question, there are three ways: One, return the letter that is sent out in mid-to-late March. The Census Bureau is required by law to keep the information of respondents confidential, according to its website. Here’s a graphic from the Census Bureau that explains more.