San Emilio, officially the Municipality of San Emilio, is a municipality in the province of Ilocos Sur, Philippines. It had a population of 7,206 peopl…San Emilio, officially the Municipality of San Emilio, is a municipality in the province of Ilocos Sur, Philippines. It had a population of 7,206 people according to the 2020 census. San Emilio is situated 72.32 kilometres from the provincial capital Vigan, and 366.52 kilometres from the country's capital city of Manila.