Mainz-Kastel is a district administered by the city of Wiesbaden, Germany. Mainz-Kastel was formerly a district of the city of Mainz, until the public administration by the city of Wiesbaden was decided on August 10, 1945. The reason for this had been the easy control of the Allied Occupation Zones in Germany, where the Rhine formed the border between the American sector and the French sector. Mainz-Kastel faces the city of Mainz on the opposite shore of the Rhine river, and connects Wiesbaden with downtown Mainz with a bridge. Adolphus Busch, founder of Anheuser-Busch, was born in Kastel (now Mainz-Kastel) in 1839.
CB&I Lummus operated an office in Mainz-Kastel which has been bought by Alstom as of 30 October 2009.[1]
The letter processing center for Deutsche Post in the greater Wiesbaden area is located in Mainz-Kastel.
Mainz-Kastel was founded about 11 BC. At that time, the Romans built a wooden bridge across the Rhine connecting Moguntiacum (Mainz) with a castle on the right bank of the river. The wooden construction was replaced by a stone bridge in 71, which lasted until about 406. From this time the remains of a Roman triumphal arch were found in Mainz-Kastel, built around 19 A.D.