Master Address File Extract (MAFX)

The Master Address File Extract (MAFX) is a Census Bureau file that contains an accurate, up-to-date inventory of all known living quarters in the United States, Puerto Rico, and associated island areas. The MAFX is used to support most of the census and surveys that the Census Bureau conducts including the decennial census, the American Community Survey, and ongoing demographic surveys. The content of the MAFX includes address information, Census geographic location codes, as well as source and history data. The MAFX provides the longitude and latitude of each housing unit.