 It is the northernmost "comune" of the Überetsch-Unterland district, bordering the municipalities of Andrian, Eppan, Bolzano, Gargazon, Mölten, Nals, and Jenesien.As of November 30, 2010, it had a population of 4,128 and an area of .The municipality of Terlan contains the "frazioni" (subdivisions, mainly villages and hamlets) Siebeneich (Settequerce) and Vilpian (Vilpiano).