Sison was once part of San Fabian until petitioners from Barrio Bolaoen signed a manifesto on June 30, 1858, expressing their intention of creating a separate pueblo.

[6] After the definition of the jurisdiction of the proposed new pueblo, the administrative proceedings began with the mayor of San Fabian himself, Don Enrique Casaoay, as among those who appeared in behalf of the petitioners.

On December 15, 1862, a royal decree was finally issued declaring the creation of a pueblo independent of San Fabian's civil jurisdiction.

[8] In 1907, Esperanza, north-east of Alava, was formed into Pinmilapil, Agat, Sagunto, Cauringan, Bila and Colisao (now in San Fabian).

[12] Sison is geographically located on the northern portion of Pangasinan, bordering the provincial boundaries of La Union and Benguet.

The Parish of Nuestra Señora del Carmel de Álava (Sison, 2434 Pangasinan) was canonically erected in 1896–1898.

It is under the jurisdiction of the Roman Catholic Diocese of Urdaneta (from the Roman Catholic Archdiocese of Lingayen-Dagupan, Archdioecesis Lingayensis-Dagupanensis, created on May 19, 1928, elevated to Archdiocese on February 16, 1963, comprising the capital of the province, 2 cities and 15 municipalities in the central part of Pangasinan; Suffragans: Alaminos, Cabanatuan, San Fernando, La Union, San Jose, Nueva Ecija and Urdaneta; Titular: St. John the Apostle and Evangelist).

In the 15th Centenary Anniversary of the Council of Ephesus, the Sison Parish was consecrated under “La Reina Del Monte Carmelo” (Our Lady of Mount Carmel), forming part of the Roman Catholic Diocese of Urdaneta in 1985.

[22][23] On July 16, 2024, the venerated Marian image of Our Lady of Mount Carmel received an episcopal coronation by Jacinto Agcaoili Jose, Bishop of Urdaneta, and was declared as the Queen and Patroness of Sison, Pangasinan.