Mombach is located on the southern (left) bank of the river Rhine, flowing from east to west after converging with the Main.

A flat hatchet dated to the early Bronze Age has been found in Mombach as well as many discoveries from Roman times.

They devastated and occupied the left bank of the Rhine up to its natural border in 1688 including Mainz without a declaration of war.

Most of the important buildings of that time grouped round the old tilia, the first chapel of Saint Nicholas, the common bakery oven and the schoolhouse.

With the repeated occupation of the left bank of the Rhine by the French Revolutionary Army, the collegial administration of Mombach by St. Peter had been terminated.

Since 1801 préfet Jean Bon Saint-André governed the département of Mont-Tonnerre and laid down the old village gates, as well as some saints' memorials in Mombach.

After the failing of Napoleon and the Congress of Vienna, the region around Mainz, Bingen, Alzey and Worms came to the Grand duchy of Hesse-Darmstadt.

Due to safety reasons, such big fire processing production sites were no longer allowed to produce within the fortress's walls.

The founding of a chemical production site, today INEOS Paraform in 1856 contributed significantly to this increase.

At the beginning of the 20th century Mombach received town gas and water supply as well as sewer connection.

A coal gasification plant and a water supply network emerged, and the electric tram connected Mombach to Mainz.

Mombach as a workers' suburb was chosen as a site for a church monument with a tomb of bishop Wilhelm Emmanuel von Ketteler.

The German Emperor Wilhelm II often watched the military exercises which took place in the Mainz Sand Dunes over many years.

Until the end of World War II Mombach was located on two floodplains and had access to a natural Rhine swimming bath.

But after Mainz lost its properties on the right bank of the Rhine, the suburbs Amöneburg, Kostheim and Kastel, as well as Bischofsheim, together with the biggest contemporary freight train station, due to the zoning of the Allied Occupation Zones in Germany, Mombach changed to an industrial site.

Early in the Middle Ages Mombach belonged to the estate of the archbishop of Mainz, who assigned the location as a Manslehen.

The typical baroque seal shows Nicholas of Myra, the patron saint of the parish church built in 1703, hovering above the clouds with his crosier.

As the new Mainz town hall had been erected between 1971 and 1974, a full set of coat of arms of all suburbs should be shown in chronological order of the incorporation in the lobby.