It belongs to the Verbandsgemeinde Rhein-Selz, whose seat is in Oppenheim.

The municipality lies in Rhenish Hesse between Mainz and Worms.

These are Bechtolsheim, Gabsheim, Friesenheim, Köngernheim and Schornsheim.

The current mayor is Marcus Becker of the citizens’ party Undenheimer freie Liste (UfL).

In 2003, Undenheim was chosen as “Rhenish Hesse’s loveliest village”.