The former municipality contained the frazioni (subdivisions, mainly villages and hamlets) of Campo Lomaso (municipal seat, also named Lomaso), Comano, Dasindo, Godenzo, Lundo, Poia, Ponte Arche and Vigo Lomaso.
Lomaso, located about 20 km southwest of Trento, bordered with the following municipalities: San Lorenzo in Banale, Stenico, Dorsino, Calavino, Bleggio Inferiore, Dro, Fiavè, Arco and Tenno.