Wiesbaden (region) follows Hesse-Homburg
Regierungsbezirk (government region)
Following the Prussian annexations after the Austro-Prussian War of 1866, the administrative region of Wiesbaden was founded on February 22, 1867, comprising the formerly independent Duchy of Nassau, the Landgraviate of Hesse-Homburg and the formerly Free City of Frankfurt, previously states of the German Confederation. The Wiesbaden Region was one of the two political subdivisions (along with Kassel Region) within the province of Hesse-Nassau (the Prussian province formed in 1868 including, besides the Wiesbaden Region, further the former Electorate of Hesse, previously another member of the German Confederation).
In 1945 the northwestern part of region was dissected, when the Wiesbaden Region was divided between the American and the French zone of occupation in Germany. The bulk of region with the city of Wiesbaden continued to exist as a region within the new state of Hesse. The dissected northwest formed a new region, the Montabaur Region within Rhineland-Palatinate.
In 1968, the region was dissolved, and its territory was merged in the Darmstadt Region.