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A media market, broadcast market, media region, designated market area, DMA or simply market is a region where the population can receive the same (or similar) television and radio station offerings, and may also include other types of media including newspapers and Internet content. They can coincide with metropolitan areas, though rural regions with few significant population centers can also be designated as markets. Conversely, very large metropolitan areas can sometimes be subdivided into multiple segments. Market regions may overlap, meaning that people residing on the edge of one media market may be able to receive content from other nearby markets. They are widely used in ratings, which are compiled in the United States by Nielsen Media Research (television) and Arbitron (radio).

Markets are identified by the largest city, which is usually located in the center. However, geography and the fact that some metropolitan areas have large cities separated by some distance can make markets have unusual shapes and result in two, three, or more names being used to identify a single region (such as Wichita-Hutchinson, Kansas; Chico-Redding, California; Albany-Schenectady-Troy, New York; and Harrisburg-Lebanon-Lancaster-York, Pennsylvania).

In North America, radio markets are generally a bit smaller than their television counterparts, as broadcast power restrictions are stricter for radio than TV, and TV reaches further via cable. AM band and FM band radio ratings are sometimes separated, as are broadcast and cable television. Market researchers also subdivide ratings demographically between different age groups, genders, and ethnic backgrounds; as well as psychographically between income levels and other non-physical factors. This information is used by advertisers to determine how to reach a specific audience. In countries such as the United Kingdom, a government body defines the media markets; in countries such as the United States, media regions are defined by a privately held institution, without government status.

A Designated Market Area (DMA) is a group of counties in the United States that are covered by a specific group of television stations. The term was coined by Nielsen Media Research, and they control the trademark on it. There are 210 DMAs in the United States.

These market areas can also be used to define restrictions on rebroadcasting of broadcast television signals. Generally speaking, only stations within the same market area can be rebroadcast. The only exception to this rule is the "significantly viewed" list.[1]

See also List of television stations in North America by media market.

Arbitron also maintains similar areas for radio stations; each is called an area of dominant influence (ADI). There are 286 ADI's in the United States.

See Also List of United States radio markets

Canada also has a similar system, run by the Bureau of Broadcast Measurement (BBM).

This short section requires expansion.

• List of U.S. Radio Markets (ranked by size)
• TruckAds DMA map

• Marketing
• Census-designated place
• Metropolitan area