Updated Aug. 13 at 6:25 p.m. ET
Starting this month, tens of thousands of Census Bureau workers are knocking on doors across the country to make sure the bureau has a complete list of addresses of where people live in the U.S.
Those addresses determine where the bureau will mail instructions and send the next major deployment of workers in 2020 for the constitutionally mandated head count of every resident, which is conducted by household.