The following maps were imported from Census data obtained from ftp://ftp.census.gov/pub/tiger/boundary/

ma1993.gif (GIF Image) ma1993.zip (MapInfo and Census Mapping Data)

1993 Metropolitan Areas (MA) - The Federal Office of Management and Budget (OMB) designates and defines MAs. MAs include Metropolitan Statistical Areas (MSAs), Consolidated Metropolitan Statistical Areas (CMSAs), and Primary Metropolitan Statistical Areas (PMSAs), of which MSAs are the most numerous. This boundary file contains only PMSAs and MSAs. The underlying concept of an MSA is that of a core area containing a large population nucleus, together with adjacent communities having a high degree of economic and social integration with that core. MSAs are composed of entire counties, except for New England, where the component entities are MCDs. According to the OMB criteria , each MSA must include either a city with at least 50,000 persons, or a Census Bureau- defined urbanized area and a total population of at least 100,000 (75,000 in New England). Within an area that meets the requirements to be an MSA and also has a population of one million or more, the OMB recognizes individual component areas if they meet specified criteria and local opinion supports their recognition. If recognized, the component areas are designated PMSAs, and the entire area that contains them becomes a CMSA. If no PMSAs are recognized, the entire area is designated an MSA. The boundary file contains PMSAs and MSAs recognized as of June, 1993, although the actual boundaries of the areas are based on 1990 counties and 1990 MCDs. The PMSA/MSA geocode consists of a 4-digit Census code.