The Official Municipality Key, formerly also known as the Official Municipality Characteristic Number or Municipality Code Number, is a number sequence for the identification of politically independent municipalities or unincorporated areas. Other nomenclatures for the demarcation of areas are postal codes, NUTS codes or FIPS codes.


In Germany the Official Municipality Key serves statistical purposes and is issued by the statistics offices of individual German states. The municipality key is to be indicated in instances such as changing residence on the notice of departure or registration documents. This is done at the registration office in every town's city hall.


The municipality key consists of eight digits, which are generated as follows: The first two numbers designate the individual German state. The third digit designates the government district (in areas without government districts a zero is used instead). The fourth and fifth digits designate the number of the urban area (in a district-free city) or the district (in a city with districts). The sixth, seventh, and eighth digits indicate the municipality or the number of the unincorporated area.

There are two imperial cities, Berlin and Vienna, which are treated as states for the purposes of the CIN. They are not, however, independent of the states in which they reside (Brandenburg and Lower Austria, respectively).


14 1 11 000: Stuttgart

  • 14: Württemberg
  • 1: Government district of Stuttgart
  • 11: Urban area of Stuttgart
  • 000: No other municipality is available, since Stuttgart is an urban area

31 3 52 002: Aschersleben

  • 31: Saxony-Anhalt
  • 3: Government district of Magdeburg
  • 52: District of Aschersleben Strassfurt
  • 002: City of Aschersleben

Federal States

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