Designated Market Areas (DMAs) are geographic regions in the United States defined by Nielsen that represent specific television and radio markets. There are 210 DMAs in total, each centered around a major metropolitan area and including surrounding communities that receive the same media offerings. DMAs help advertisers target audiences more effectively, as ad costs and reach can vary widely based on the population and media consumption habits within each DMA. For example, advertising in the New York City DMA typically costs more than in smaller markets like Montgomery, Alabama due to its larger audience size.
More information: location targeting
