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4 Department of ComMerce Bureau of the Census. The Bureau of the Census :: makes use o~ SMSA's rn irs data tabulation programs for the decennial census,, the economic censuses, and other surveys. When changes occur in criteria for SMSA's, the changes may be reflected in areas recognized for data tabulation; examples are programs which provide data for central business districts and major retail centers where all cities named in the titles of S~4SA's are eligible to have ~ central business district defined. If the SMSA criteria change and name changes occur, or if the way in which central cities are defined is revised, the Bureau of the Census will consider changing the criteria for eligibility for some programs, such as those for centca! business districts, pending the effects of the proposed changes in SMSA criteria on the existing list of central cities. The Bureau of the Census maintains the GBF/DIb!E files :.i[ which reference ranges of addresses to census geoqraphy ~.:' for tabulation purposes. While traditionally the Bureau ha~ made commitments to use these files only in SMSA's, it is presently working with several nonmetropo!itan ~:: agencles to create these files, for use locally where city- rype address systems exist. The Bureau plans to continue to cover, such areas in this manner. The establishment of census tracts and tabulation of data ~o these tracts, as well as the collection and tabulation of dare at the block level, are non dependent on an area's '~.:. S.~SA status. Whether the data are published or made avail- ... able only ~n unpublished form, however, may be dependent on S~!SA status, tn addition, ~arlous Federal and State. laws require the use of census tract numbers in bank mortgage records. (See the section on' the Home Mortgage Disclosure Act.) Usually the guidelines for implementing these laws limit this requirement to areas with ~eadily available source material for the tract members. Generally such areas coincide with the SMSA's reflected in the latest decennial censu~ publications. Likewise, the definition of urbanized areas by the Bureau of the Census ~s not dependent on SMSA status. [n general, however, the criteria for central cities of an urbanized area have tended to parallel the criteria for central cities of an SMSA. Changes ~n SMSA criteria could affect the number of urbanized areas, but not the areal extent of individual urbanized areas.