Bakun, Benguet

During the Spanish Period, Bakun was a rancheria of the Commandancia Politico-Militar de Amburayan. Ampusongan (currently a barangay of Bakun) was a rancheria of the Commandancia Politico Militar de Tiagan, Distrito de Benguet.

When the United States took control of the Philippines, the American Congress issued Act No. 48 in November 1900, placing Bakun under the province of Amburayan, and Ampusongan under the province of Benguet.[6] On August 13, 1908, Benguet became a subprovince of the newly established Mountain Province with the enactment of Act No. 1876, and the municipal districts of Bakun and Ampusongan became part of the subprovince.

In 1917, the Bureau of Non-Christian Tribes recommended that the western border of the Mountain Province be pushed eastward, such that the entire subprovince of Amburayan and large slices of Lepanto and Benguet would be made part of Ilocos Sur and La Union. In early 1937, Ampusongan was merged with Bakun, the latter carrying the name of the township while the former became a barangay. The issuance of Republic Act No. 4695 in 1966 included Bakun as a regular municipality in the newly created province of Benguet.