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 classifications for the identification of areas include postal codes, NUTS codes or FIPS codes. Germany 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. Structure The municipality key consists of eight digits, which are generated as follows: The designate the individual German state. The designates the government district (in areas without government districts a zero is used instead). The designate the number of the urban area (in a district-free city) or the district (in a city with districts). The indicate the municipality or the number of the unincorporated area. Examples : Stuttgart : Baden-Württemberg : Government district of Stuttgart : Urban area of Stuttgart : No other municipality is available, since Stuttgart is an urban area : Aschersleben : Saxony-Anhalt : Government district of Magdeburg : District of Aschersleben Staßfurt : City of Aschersleben Federal States 01: Schleswig-Holstein 02: Hamburg 03: Lower Saxony 04: Bremen 05: North Rhine-Westphalia 06: Hesse 07: Rhineland-Palatinate 08: Baden-Württemberg 09: Bavaria 10: Saarland 11: Berlin 12: Brandenburg 13: Mecklenburg-Vorpommern 14: Saxony 15: Saxony-Anhalt 16: Thuringia Austria Structure The municipality identifier consists of five digits in Austria, which are generated as follows: The designates the number of the Austrian state, the designate the district, and the designate the municipality. Examples : Rappottenstein : Lower Austria : Zwettl district : Municipality of Rappottenstein : Vienna - Neubau : Vienna : Neubau (7th district) : District of Neubau Federal States 1 Burgenland 2 Carinthia 3 Lower Austria 4 Upper Austria 5 Salzburg 6 Styria 7 Tyrol 8 Vorarlberg 9 Vienna Switzerland Structure The Swiss Federal Statistical Office generates code numbers with up to four digits, which are sequentially assigned in accordance with the official order of the cantons, districts, and municipalities. Cantons France See Code officiel géographique. Poland See System identyfikatorów i nazw miejscowości Sweden A kommunkod (municipal code) is a numerical code given to all Swedish municipalities by the Swedish tax authorities. The code consists of four digits, the first two