American Housing Survey MSA Zone-to-Tract Mapping

<p>This file collection contains data relating to the 1980 and 1990 Census tracts in each "zone," and also provides summaries for the geographical changes in the American Housing Survey-Metropolitan Sample (AHS-MS) from 1988 through 1998. The smallest geographic area identified by the American Housing Survey Metropolitan Sample (AHS-MS) is the "zone." Zones are groups of Census tracts that have minimum populations of 100,000 persons and are as homogenous as possible in terms of housing and demographic characteristics. In the AHS Metro Survey Geographic Changes file, for each year it shows the metropolitan areas surveyed, the prior survey year for each metropolitan area, and any changes in the geography by zone.</p>