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Effective January 1, 2001, the Berlin borough reform reduced the number of Berlin's boroughs from 23 to 12 in order to cut down administration costs. This was achieved by combining several of the old boroughs.
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 | 320,420 |
| II | Friedrichshain-Kreuzberg | Friedrichshain, Kreuzberg | 20.16 | 256,419 |
| III | Pankow | Prenzlauer Berg, Weißensee , Pankow | 103.07 | 348,412 |
| IV | Charlottenburg-Wilmersdorf | Charlottenburg, Wilmersdorf | 64.72 | 315,054 |
| V | SpandauSpandau is the westernmost borough Bezirk of Berlin, situated at the confluence of the Havel and Spree rivers and along the western bank of the Havel. It encompasses an area of 91. 91 km² and has (as of 2003) about 226. 100 inhabitants. Its current mayor | Spandau (unchanged) | 91.91 | 225,856 |
| VI | Steglitz-ZehlendorfSteglitz-Zehlendorf is a borough of Berlin, formed in 2001 by merging the former boroughs of Steglitz and Zehlendorf. It encompasses an area of 102. 50 km² and has, as of 2003, about 288,300 inhabitants. Its current mayor is Herbert Weber ( CDU). External | Steglitz , ZehlendorfZehlendorf is the southwestern-most district in Berlin. When American forces occupied Berlin, and later were stationed in Berlin during the Cold War, Zehlendorf was the area where most of those forces were centered. An American Consulate is still located | 102.50 | 288,285 |
| VII | Tempelhof-SchönebergTempelhof-Schoneberg is a borough of Berlin, formed in 2001 by merging the former boroughs of Tempelhof and Schoneberg. It encompasses an area of 53. 09 km² and has, as of 2003, about 336,000 inhabitants. Its current mayor is Ekkehard Band ( SPD). Externa | TempelhofTempelhof is a borough of the city of Berlin that was united with Schoneberg in 2001 to form Tempelhof-Schoneberg. It is the location of Tempelhof International Airport. Tempelhof is in the southern part of the city and borders Brandenburg. The borough of, SchönebergSchoneberg is a district of Berlin. Until 2001 it was a separate borough, and is now part of Tempelhof-Schoneberg. History first documented in 1264. 1751 Neu-Schoneberg also known as Bohmisch-Schoneberg , the current Hauptstrasse, founded by Bohemian Weav | 53.09 | 335,171 |
| VIII | NeuköllnNeukolln is a borough of Berlin. It encompasses an area of 44. 93 km² and has, as of 2003, about 307,400 inhabitants. Its current mayor is Heinz Buschkowsky ( SPD). External links . | Neukölln (unchanged) | 44.93 | 306,214 |
| IX | Treptow-KöpenickTreptow-Kopenick is a borough of Berlin, formed in 2001 by merging the former boroughs of Treptow and Kopenick. It encompasses an area of 168. 43 km² and has, as of 2003, about 233,700 inhabitants. Its current mayor is Klaus UIbricht ( SPD). External link | Treptow , Köpenick | 168.43 | 233,923 |
| X | Marzahn-Hellersdorf | Marzahn , Hellersdorf | 61.74 | 252,602 |
| XI | Lichtenberg | Lichtenberg, Hohenschönhausen | 52.29 | 258,455 |
| XII | Reinickendorf | Reinickendorf (unchanged) | 89.45 | 246,118 |