San Juan is a 5th municipal income class municipality in the province of Siquijor, Philippines. According to the 2015 census, it has a population of 14,854. In the 2016 electoral roll, it had 10,037 registered voters. ^ Census of Population. "Region VII ". Total Population by Province, City, Municipality and Barangay. PSA. Retrieved 20 June 2016. ^ "2016 National and Local Elections Statistics". Commission on Elections. 2016.