As a commune, Puerto Montt is a third-level administrative division of Chile administered by a municipal council, headed by an alcalde who is directly elected every four years. The 2008–2012 alcalde is Rabindranath Quinteros Lara (PS).
Within the electoral divisions of Chile, Puerto Montt is represented in the Chamber of Deputies by Marisol Turres (UDI) and Patricio Vallespín (PDC) as part of the 57th electoral district, (together with Cochamó and Maullín, Calbuco). The commune is represented in the Senate by Camilo Escalona Medina (PS) and Carlos Kuschel Silva (RN) as part of the 17th senatorial constituency (Los Lagos Region).
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