San Vicente, officially the Municipality of San Vicente, is a municipality in the province of Ilocos Sur, Philippines. According to the 2020 census…San Vicente, officially the Municipality of San Vicente, is a municipality in the province of Ilocos Sur, Philippines. According to the 2020 census, it has a population of 13,118 people. San Vicente is 3 kilometres from Vigan and 408 kilometres from Manila.