2000. Geographic Data Technology, Inc. (GDT). A U.S. Designated Market Area (DMA) is generally the group of surrounding counties or split counties (by five-digit ZIP) in which metropolitan cent... Environmental Systems Research Institute, Inc. (ESRI).
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2000. Geographic Data Technology, Inc. (GDT). U.S. Populated Place Areas represents populated place areas that include census designated places, consolidated cities, and incorporated places wit... Environmental Systems Research Institute, Inc. (ESRI).