Landgraviate of Hesse-Darmstadt
In 1802 the Landgraviate of Hesse-Darmstadt took over the joint dominion of the town, which was the 2nd most important town of the district of Dieburg which was founded at that time. From 1857 the town adopted the name of Gross-Umstadt to distinguish it from Klein-Umstadt and Wenigumstadt. Many factories were established in the town after it obtained a railway connection.