Grasellenbach borders in the north on the community of Fürth, in the east on the community of Mossautal (Odenwaldkreis), in the south on the community of Wald-Michelbach and in the west on the community of Rimbach.
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Buslines run to the railway stations in Heppenheim and Weinheim, which, just like Grasellenbach, belong to the Rhine-Neckar Transport Network (Verkehrsverbund Rhein-Neckar).
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The Ellen part of the name most likely comes from the word Elm, which had the same meaning in German as it still has in English (although the current German word is Ulme).