the community starzach consists of the previously independent municipalities bierlingen, börstingen, felldorf, sulzau and wachendorf. to the former municipality bierlingen belongs the village bierlingen and the farm neuhaus. to former municipality börstingen belongs the village börstingen with the rest of the castle siegburg and the houses bahnhof eyach, carbonic acid plant, lohmühle (today according to eyach) and wilhelmshöhe.