Bulnes is a Chilean city and commune in Diguillín Province, Ñuble Region.

According to the 2002 census of the National Statistics Institute, Bulnes spans an area of 425.4 km2 (164 sq mi) and has 20,595 inhabitants (10,275 men and 10,320 women).

[3] As a commune, Bulnes 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 municipal council has the following members:[1][2] Within the electoral divisions of Chile, Bulnes is represented in the Chamber of Deputies by Jorge Sabag (PDC) and Frank Sauerbaum (RN) as part of the 42nd electoral district, together with San Fabián, Ñiquén, San Carlos, San Nicolás, Ninhue, Quirihue, Cobquecura, Treguaco, Portezuelo, Coelemu, Ránquil, Quillón, Cabrero and Yumbel.

The commune is represented in the Senate by Alejandro Navarro Brain (MAS) and Hosain Sabag Castillo (PDC) as part of the 12th senatorial constituency (Biobío-Cordillera).