Alcala is a third class municipality in the province of Cagayan, Philippines. According to the 2015 census, it has a population of 38,883 people. Alcala is home to the Saint Philomene Church, regarded as the widest church in the Cagayan Valley. Alcala Milk Candy is a famous product of this municipality. ^ "Region II ". Census of Population : Total Population by Province, City, Municipality and Barangay. PSA. Retrieved 20 June 2016.