Benito Soliven, officially the Municipality of Benito Soliven, is a municipality in the province of Isabela, Philippines. According to the 2020 census…Benito Soliven, officially the Municipality of Benito Soliven, is a municipality in the province of Isabela, Philippines. According to the 2020 census, it has a population of 29,752 people. The town is named after the late Benito Soliven, Congressman of Ilocos Sur, during the Commonwealth government.