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DMA and MMA are commonly used to denote a large, metropolitan municipal entity.

Is there a difference between the two? Is there a certified definition to these terms? Google is a bit inconclusive about the issue.

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Found a definition for DMA. You might want to check it out. gis.stackexchange.com/a/40904/292 –  R.K. Dec 4 '12 at 5:59

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up vote 2 down vote accepted

I'm assuming you're referring to specific to the USA. After much searching I came across this page: http://www.census.gov/population/www/documentation/twps0006/table03.html which states:

 Major metropolitan areas (MMAs; areas of one million or more population)

I can't find anything official for DMA. It seems to be used unofficially for "District Metropolitan Area", specifically Washington DC usually but that's it.

Assuming you're using statistics, you may be interested in the wikipedia articles which reference "Metropolitan Statistical Areas" and Core Based Statistical Areas

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Found the same definition for MMA as GIS-Jonathan. For DMA though, I found this at Wikipedia.

A media market, broadcast market, media region, designated market area (DMA), Television Market Area (FCC term), 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 or overlap with 1 or more metropolitan areas, though rural regions with few significant population centers can also be designated as markets.

Could be the MMA you're referring to.

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