Metropolitan Statistical Area (MSA)
Is a U.S. Government classification for a free-standing urban
population center with a population in the urban center of at least
50,000 and a total MSA population of 100,000 or more. Buyers in
MSAs typically exhibit social and economic homogeneity. MSAs
usually border on non-urbanized counties. Peoria, Illinois, and
Sheboygan, Wisconsin, are examples.
Designated Market Area (DMA)
Is a geographic area defined by nielsen media research company
as a group of counties that make up a particular television market.
These counties comprise the major viewing audience for the
television stations located in their particular metropolitan area.
For the most part, the metropolitan areas correspond to the
standard metropolitan statistical areas (see metro area) defined by
the Federal Government Office of Management and Budget. The areas
do not overlap, and every county in the United States belongs to
only one DMA. dmas are used in the evaluation of audience data as
well as in the planning and buying of media.