High Quality Content by WIKIPEDIA articles! Offenbach is a Kreis (district) in the south of Hesse, Germany and is part of the Frankfurt/Rhine-Main Metropolitan Region. Neighbourhood districts are Main-Kinzig, Aschaffenburg, Darmstadt-Dieburg and the cities of Darmstadt, Groß-Gerau, Frankfurt and Offenbach. The Frankfurt/Rhine-Main Metropolitan Region, often simply referred to as Frankfurt Rhine-Main, Frankfurt Rhine-Main area or Rhine-Main area (German: Frankfurt/Rhein-Main, abbreviated FRM) is the second largest metropolitan region in Germany, with a total population exceeding 5.8 million. The metropolitan region is located in the central western part of Germany, and stretches over parts of three federal states: Hesse, Rhineland-Palatinate and Bavaria, as well as the cities of Frankfurt am Main, Wiesbaden, Offenbach, Mainz, Darmstadt and Aschaffenburg.