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Berlin is subdivided into 12 'boroughs' (''Bezirke'' in German), which are administrative units with political rights comparable to incorporated communities in the rest of Germany (although they are not separate legal entities from the city).
Effective January 1, 2001, the Berlin borough reform reduced the number of Berlin's boroughs from 23 to 12 in order to cut down administrative costs. This was achieved by combining several of the old boroughs.
See also this list of all current boroughs and their component parts.
In detail, the old and the new boroughs relate as follows:

	New borough name	Old borough names	Area in km²	Population
'I'	Mitte	Mitte, Tiergarten, Wedding	39.74	322,932
'II'	Friedrichshain-Kreuzberg	Friedrichshain, Kreuzberg	20.16	261,266
'III'	Pankow	Prenzlauer Berg, Weißensee, Pankow	103.07	353,629
'IV'	Charlottenburg-Wilmersdorf	Charlottenburg, Wilmersdorf	64.72	315,479
'V'	Spandau	Spandau (unchanged)	91.91	225,283
'VI'	Steglitz-Zehlendorf	Steglitz, Zehlendorf	102.50	288,928
'VII'	Tempelhof-Schöneberg	Tempelhof, Schöneberg	53.09	333,601
'VIII'	Neukölln	Neukölln (unchanged)	44.93	305,915
'IX'	Treptow-Köpenick	Treptow, Köpenick	168.43	235,313
'X'	Marzahn-Hellersdorf	Marzahn, Hellersdorf	61.74	250,794
'XI'	Lichtenberg	Lichtenberg, Hohenschönhausen	52.29	258,773
'XII'	Reinickendorf	Reinickendorf (unchanged)	89.45	244,618

''(all data as of 10/2005)''
For further information see: Berlin
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