Solsona, officially the Municipality of Solsona, is a municipality in the province of Ilocos Norte, Philippines. According to the 2020 census, i…Solsona, officially the Municipality of Solsona, is a municipality in the province of Ilocos Norte, Philippines. According to the 2020 census, it has a population of 24,851 people. Ascents of nearby Mount Sicapoo begin at Solsona, at the Gasgas River.