From the US Census Bureau:
As you are probably aware, due to the Covid-19 Pandemic, the Census Bureau adjusted their operational timeline. As the State of Wisconsin begins to reopen, the Census Bureau is beginning to restart our field operations.
The U.S. Census Bureau, in coordination with federal, state and local health officials, will begin our Update/Leave Operation in Wisconsin this week. Census workers will begin to drop off 2020 Census questionnaire packets at front doors in areas where the majority of households do not receive mail at their physical address.