Currently the U.S. Census Bureau is conducting research on ways to use administrative records to reduce the cost and improve the quality of the 2020 Census Nonresponse Followup (NRFU) at addresses where the Census Bureau did not receive a self-response electronically or by mail. Regardless of the number of contact attempts the 2020 Census NRFU design permits, enumerators will confront the problem of not being able to contact the residents at some addresses. In previous censuses, the strategy at this point has been to find a knowledgeable person, such as a neighbor or apartment manager, who could provide the census information for the residents, called a proxy response. The Census Bureau’s recent advances in merging federal and third-party databases to create households that can be used for census enumeration purposes raises the question: Are proxy responses for NRFU addresses more or less accurate than the administrative records available for the housing unit?