Santa Cruz (, officially the Municipality of Santa Cruz, is a municipality in the province of Ilocos Sur, Philippines. According to the 2020 census…Santa Cruz (, officially the Municipality of Santa Cruz, is a municipality in the province of Ilocos Sur, Philippines. According to the 2020 census, it has a population of 41,366 people. The place now known as Santa Cruz was the site where Captain Juan de Salcedo landed to get provisions, especially water, on his way to pacify the north. As soon as they came ashore, his men immediately went to the top of the highest sand dune and planted a big wooden cross to signify that the place has been conquered. This cross is visible to mariners passing by, often describing the place as "Santa Cruz." The cross may have vanished, but the name Santa Cruz stuck, especially with natives who became Christians.