 Afterwards large parts belonged to the duchy of Mecklenburg-Schwerin, a small portion to the duchy of Mecklenburg-Strelitz (see Mecklenburg).Güstrow District was established in 1994 by merging the former districts of Güstrow, Teterow and Bützow.This district was merged with the district of Bad Doberan at the district reform of 4 September 2011, forming the new district of Rostock.