Gensingen lies in Rhenish Hesse between Mainz and Bad Kreuznach on the river Nahe.

The municipality's neighbours are Grolsheim, Langenlonsheim, Horrweiler, Laubenheim, Welgesheim, Aspisheim, Biebelsheim, Ockenheim, Bretzenheim, Zotzenheim, Dorsheim, Sprendlingen and Bad Kreuznach-Ippesheim.

The council is made up of 21 council members, counting the part-time mayor, with seats apportioned thus: (as at municipal election held on 13 June 2004) The municipality's arms might be described thus: or, the letter G between three mullets of six sable.

[3] The Evangelical church has an historical Stumm organ built in 1774-1778 and restored in 2000.

Two businesses in the municipality of Gensingen are the furniture manufacturer Bretz and the plant nursery company Kientzler.