Location

Klein-Winternheim lies seven kilometres south of Mainz in Rhenish Hesse. The winegrowing centre belongs to the Verbandsgemeinde of Nieder-Olm, whose seat is in the like-named town.

Municipal council

The council is made up of 20 council members, plus the part-time mayor, with seats apportioned thus:

(as at municipal election held on 9 June 2024^[3])

Twin towns

• Muizon, Marne, France
• Elxleben, Sömmerda district, Thuringia – close contacts since 1990

Coat of arms

The municipality's arms might be described thus: Gules a saltire couped Or, in base a wheel spoked of six argent; Wheel of Mainz.

Transport

• The municipality lies right near the Autobahn A 63 with its Klein-Winternheim (3) interchange.
• The Deutsche Bahn railway station Klein Winternheim-Ober Olm is in the community (Alzey–Mainz line).