According to the U.S. Census Bureau, County Subdivisions are the primary divisions of counties and equivalent entities. They include census county divisions, census subareas, minor civil divisions, and unorganized territories and can be classified as either legal or statistical. Minor civil divisions (MCDs) are the primary governmental or administrative divisions of a county in many states (parishes in Louisiana) and the county equivalents in Puerto Rico and the Island Areas. Census county divisions (CCDs) are areas delineated by the Census Bureau in cooperation with state, tribal, and local officials for statistical purposes. CCDs have no legal function and are not governmental units. CCDs often exist where there are no legally established MCDs. Census subareas are statistical subdivisions of boroughs, city and boroughs, municipalities, and census areas, all of which are statistically equivalent entities for counties in Alaska. For more information, see https://www.census.gov/programs-surveys/geography/about/glossary.html#par_textimage_11.