Mainz-Amöneburg is a district administered by the city of Wiesbaden

Wiesbaden

Wiesbaden is a city in southwest Germany and the capital of the federal state of Hesse. It has about 275,400 inhabitants, plus approximately 10,000 United States citizens...

, Germany

Germany

Germany , officially the Federal Republic of Germany , is a federal parliamentary republic in Europe. The country consists of 16 states while the capital and largest city is Berlin. Germany covers an area of 357,021 km2 and has a largely temperate seasonal climate...

. Mainz-Amöneburg was formerly a district of the city of Mainz

Mainz

Mainz under the Holy Roman Empire, and previously was a Roman fort city which commanded the west bank of the Rhine and formed part of the northernmost frontier of the Roman Empire...

, until the public administration by the city of Wiesbaden

Wiesbaden

Wiesbaden is a city in southwest Germany and the capital of the federal state of Hesse. It has about 275,400 inhabitants, plus approximately 10,000 United States citizens...

 was decided on August 10, 1945. The reason for this had been the easy control of the Allied Occupation Zones in Germany

Allied Occupation Zones in Germany

The Allied powers who defeated Nazi Germany in World War II divided the country west of the Oder-Neisse line into four occupation zones for administrative purposes during 1945–49. In the closing weeks of fighting in Europe, US forces had pushed beyond the previously agreed boundaries for the...

, where the Rhine formed the border between the American sector and the French sector. Mainz-Amöneburg faces the city of Mainz on the opposite shore of the Rhine river. The former border between the Grand Duchy of Hesse

Grand Duchy of Hesse

The Grand Duchy of Hesse and by Rhine , or, between 1806 and 1816, Grand Duchy of Hesse —as it was also known after 1816—was a member state of the German Confederation from 1806, when the Landgraviate of Hesse-Darmstadt was elevated to a Grand Duchy, until 1918, when all the German...

 and the Prussian Province of Hesse-Nassau lay between Amöneburg and Biebrich

Wiesbaden-Biebrich

Biebrich is a borough of the city of Wiesbaden, Hesse, Germany. With over 36,000 inhabitants, it is the most-populated of Wiesbaden's boroughs. It is located south of the city center on the Rhine River, opposite the Mainz borough of Mombach...

 until 1945.

Two companies which were at first independent, but which later belonged to the same company, Hoechst AG

Hoechst AG

Hoechst AG was a German chemicals then life-sciences company that became Aventis Deutschland after its merger with France's Rhône-Poulenc S.A. in 1999...

, had been located in Amöneburg (Chemische Werke Albert) and Biebrich (Chemische Fabrik Kalle), one on each side of the border. Recent mergers, acquisitions and transitions took place. Now, the industrial site InfraServ Wiesbaden runs the infrastructure.