[The instruction guide for American Community Survey (ACS) has not been provided to respondents since 2017. The Census Bureau recommends referring to the 2016 version of the instruction guide. However, due to a few discrepancies between the 2016 and 2020 surveys, this is a more recent version of the instruction guide posted online (https://www.census.gov/programs-surveys/acs/respond/get-help.html). Please note that the questionnaires of the 2020 American Community Survey (ACS) and 2020 Puerto Rico Community Survey (PRCS) are identical.]