Rima San Giuseppe borders the following municipalities: Alagna Valsesia, Boccioleto, Carcoforo, Macugnaga, Mollia, Rimasco, and Riva Valdobbia.
Riva Valdobbia borders the following municipalities: Alagna Valsesia, Campertogno, Gressoney-La-Trinité, Gressoney-Saint-Jean, Mollia, Rassa, and Rima San Giuseppe.