merged into the latter in 1822. Regierungsbezirk Frankfurt Urban districts (Stadtkreise) Cottbus (1886–1950, and from 1954; 1947–1952, and from 1990 part of Brandenburg state) Forst (Lusatia), (1897–1950; quarters west of the Oder merged in Cottbus district; from 1947 part of Brandenburg state) Frankfurt (Oder), (until 1827, 1877–1950, and from 1952; 1947–1952, and from 1990 part of Brandenburg state) Guben, (1884–1950; quarters west of the Oder merged in Cottbus district; from 1947 part of Brandenburg state) Landsberg (Warthe), (1892–1945) Rural districts (Landkreise) Arnswalde, (1818–1945; from 1938 part of Pomerania province) Calau, (1818–1950; from 1947 part of Brandenburg state) Cottbus, (1818–1952; from 1947 part of Brandenburg state) Crossen (Oder), (1818–1945) Cüstrin, (until 1836; merged into Königsberg district) Friedeberg Nm. (i.e. in the New March; 1816–1945; from 1938 part of Pomerania province) Guben, (1818–1950; from 1947 part of Brandenburg state) Königsberg Nm. (i.e. in the New March; 1816–15 March 1946, remainder west of the Oder merged into Angermünde, Lebus and Oberbarnim districts) Landsberg (Warthe), (1818–1945) Lebus, (1816–1950; from 1947 part of Brandenburg state) Luckau, (1816–1952; from 1947 part of Brandenburg state) Lübben (Spreewald), (1816–1952; in 1835 Beeskow area ceded to Beeskow-Storkow; from 1947 part of Brandenburg state) Meseritz, (1818–1945; until 1938 part of Posen-West Prussia) Oststernberg, (1873–1945; partitioned from Sternberg district) Schwerin (Warthe) (1887–1945; until 1938 part of Posen-West Prussia) Soldin, (1818–1945) Sorau (Lusatia), (1816–1 April 1946, remainder west of the Oder merged into Cottbus, Forst and Spremberg districts) Spremberg (Lusatia), (1818–1993; 1947–1952, and from 1990 part of Brandenburg state) Sternberg, (1816–1873; partitioned into Ost- and Weststernberg) Weststernberg, (1873–1945; partitioned from Sternberg district) Züllichau-Schwiebus, (1818–1945) Regierungsbezirk Potsdam Urban districts (Stadtkreise) Berlin, (1822–1881; on 1 April 1881 the city was disentangled from the Province of Brandenburg.) Brandenburg (Havel), (from 1881; from 1947 part of Brandenburg state) Charlottenburg, (1877–1920; merged in Greater Berlin) Eberswalde, (1911–1950; merged in Oberbarnim district; from 1947 part of Brandenburg state) Lichtenberg, (1908–1920; from 1912: known as Berlin-Lichtenberg; merged in Greater Berlin) Potsdam, (from 1809; 1947–1952, and from 1990 part of Brandenburg state) Rathenow, (1925–1950; merged in Westhavelland district; from 1947 part of Brandenburg state) Rixdorf, (1899–1920; from 1912: known as Berlin-Neukölln; merged in Greater Berlin) Schöneberg, (1899–1920; from 1912: known as Berlin-Schöneberg; merged in Greater Berlin) Spandau, (1886–1920; merged in Greater Berlin) Wilmersdorf, (1907–1920; from 1912: known as Berlin-Wilmersdorf; merged in Greater Berlin) Wittenberge, (1922–1950; merged in Westprignitz district; from 1947 part of Brandenburg state) Rural districts (Landkreise) Angermünde, (1818–1952;