Every 10 years the United States does a census. Many people have got a letter in the mail or at their door . It gives a code to type in at www. my2020census.gov
some people may mistakenly think the letter is junk mail since no name is on it. If you accidentally through it away or didn’t get a letter there is still a way of entering without the code.
They say doing it online saves time and money for processing. They will send out paper survey for those not done online.