As we continue to process 2020 Census responses, people have asked what happens when we don’t get a response from an address. In this blog, I’ll describe the statistical techniques we turn to when we do not get a response. To get a complete and accurate census, we need to know certain information about every household address in the census: Whether it is a real and livable residence. If so, whether it is vacant or occupied. If it's occupied, how many people live there.