How is the Census Conducted?

Although Census Day is officially observed on April 1, 2020, the count will begin before then. The 2020 Census will be the first time that households have the option of responding online, by mail, or by phone. In mid-March 2020, most households will receive an invitation in the mail encouraging you to respond online. Areas with households that are less likely to respond online will receive paper questionnaires with their invitation. Responding by phone is also an option. Beginning in May 2020, the Census Bureau will follow up with households that have not responded.

[Source: U.S. Census Bureau]

Didn't receive a Census notice due to having a PO Box address? 
Visit - 
Click the Respond Button (to respond online) or click the Learn How button if you want to respond by phone.
For Online Response -  click the Start Questionnaire button.
Enter the 12 digit Census ID and Login, or if you don’t have the 12 digit Census ID number, select the “If you do not have a Census ID, click here” link.
After this, follow the prompts to fill in the form.

If you wish to call-in instead, you can call 844-330-2020 for English, or 844-468-2020 for Spanish.  Phone lines are open 7 am - 2 am Eastern every day.

Note the Census will never ask for your full social, bank account or credit card numbers, anything on behalf of a political party, money or donations.