Bayambang, officially the Municipality of Bayambang, is a municipality in the province of Pangasinan, Philippines. According to the 2020 cens…Bayambang, officially the Municipality of Bayambang, is a municipality in the province of Pangasinan, Philippines. According to the 2020 census it has a population of 129,011. It previously included the municipalities of Bautista, Alcala, Santo Tomas, Rosales, Paniqui, Gerona and Camiling. It was founded in the 16th century by Agalet, an Aeta.