Aßlar lies on a foothill of the Westerwald range as well as on the river Dill, which empties into the Lahn in neighbouring Wetzlar, about 5 km to the southeast. It is also not far from the "three-state-border", a geographical point common to Hesse, North Rhine-Westphalia and Rhineland-Palatinate, lying to the west.
The constituent community of Werdorf also lies on the Dill, as do Klein-Altenstädten and Berghausen. Bechlingen, Oberlemp and Bermoll lie north of the main town, away from the river.
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