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 containing a substantial population nucleus, together with adjacent communities having a high degree of social and economic 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 (urban area or urban cluster) with a population of at least 10,000, plus 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 has at least one urban area that has a population of at least 50,000. Each Micropolitan Statistical Area has at least one urban area or urban cluster that has a population of at least 10,000, but less than 50,000.