Description: U.S. Census Block Groups represents the U.S. Census block groups of the United States in the 50 states, the District of Columbia, and Puerto Rico.
Description: U.S. Core Based Statistical Areas represents geographic entities, defined by the United States Office of Management and Budget (OMB) for use by Federal statistical agencies, based on the concept of a core area with a large population nucleus, plus adjacent communities having a high degree of economic and social integration with that core. A Core Based Statistical Area (CBSA) consists of a U.S. county or counties or equivalent entities associated with at least one core (urbanized area or urban cluster) with a population of at least 10,000 along with any adjacent counties having a high degree of social and economic integration with the core as measured through commuting ties with the counties containing the core. CBSAs are categorized as being either Metropolitan or Micropolitan. Each Metropolitan Statistical Area must have at least one urbanized area of 50,000 or more inhabitants. Each Micropolitan Statistical Area must have at least one urban cluster with a population of at least 10,000 but less than 50,000.
Copyright Text: U.S. Office of Management and Budget
Description: U.S. ZIP Code Areas (Five-Digit) represents five-digit ZIP Code areas used by the U.S. Postal Service to deliver mail more effectively. The first digit of a five-digit ZIP Code divides the United States into 10 large groups of states numbered from 0 in the Northeast to 9 in the far West. Within these areas, each state is divided into an average of 10 smaller geographical areas, identified by the second and third digits. These digits, in conjunction with the first digit, represent a sectional center facility or a mail processing facility area. The fourth and fifth digits identify a post office, station, branch or local delivery area.