The American Community Survey (ACS) uses mail, computer assisted telephone interviewing (CATI), and computer assisted personal visit interviewing (CAPI) to collect the survey data. In November and December of 2001, ACS staff conducted a test to assess the feasibility of using “mail” as a data collection methodology in Puerto Rico. This is the first time the Census Bureau attempted to collect data using mailout methods in Puerto Rico. The results from this test show that we received mail responses from 27.8 percent of the addresses to which we mailed an ACS mail questionnaire. This report also provides results on the deliverability rate and the quality of the deliverability indicator on the contractor’s file.