Hünstetten borders in the north on the community of Hünfelden, in the northeast on the town of Bad Camberg (both in Limburg-Weilburg), in the east on the town of Idstein, in the south on the town of Taunusstein and in the west on the communities of Hohenstein and Aarbergen (all in the Rheingau-Taunus-Kreis).
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The coat of arms was approved in December 1979 by the State Archive in Darmstadt, and was given its form by Bad Nauheim heraldic artist Heinz Ritt after the community’s guidelines.