If you’re a census slacker and haven’t yet filled out the form for the 2020 headcount, the federal government is trying another way to get in touch with you.

Starting Wednesday, the U.S. Census Bureau is mailing out millions of paper forms to homes whose residents haven’t yet answered the once-a-decade questionnaire.

About a month into the start of the 2020 census for most U.S. residents, the self-response rate is approaching half of all households.

Minnesota, Wisconsin, and Michigan are setting the pace with response rates over 50%. Alaska, West Virginia and New Mexico are lagging with response rates ranging between a quarter and a third of households.