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MSAs & DMAs: What Are They?

MSA: Metropolitan Statistical Area. In the United States, a metropolitan statistical area is a geographical region with a relatively high population density at its core and close economic ties throughout the region. Such regions are not legally incorporated as a city or town would be and are not legal administrative divisions like counties or separate entities such as states. As a result, sometimes the precise definition of a given metropolitan area will vary between sources. The statistical criteria for a standard metropolitan area were defined in 1949 and redefined as a metropolitan statistical area in 1983.

DMA: Designated Market Areas. These are a proprietary geography defined by Nielsen. They are non-overlapping geographic regions that group counties based on television viewing areas. Each DMA® represents an area in which local television stations capture a dominant share of viewing. There are currently 210 DMA® regions in total, covering the entire continental U.S., Hawaii, and parts of Alaska. Each year, we review all DMA® regions to determine if we should add or remove any counties from a DMA® region. These defined areas are used extensively in the television industry for audience measurement, advertising planning and media buying. For instance, Atlanta is ranked number 7 in the country for Nielsen DMAs for 2025.