The first major field operation of the 2020 Census has begun. The Census Bureau is currently conducting Address Canvassing, the first major field operation of the 2020 Census, and will continue to run through mid-October. Census Bureau address canvassers ensure an accurate and complete count by verifying addresses, which involves noting where houses, apartments, shelters, and other residences are located. Prior to the 2010 Census, address canvassing was done for 100% of the addresses. For the 2020 Census, only about 30% of the addresses will be visited by address canvassers and only in areas where there has been significant changes over the past 10 years. The address canvassers will knock on the door of an address they are trying to verify to confirm the address and inquire if there are any other separate living quarters in the house. These activities will take place during daylight hours. If no one answers the door, the address canvasser will look for visual identifiers to confirm the address, such as an address on a mail box, and if nothing can be found, the address will be flagged for further follow-up.