South Padre Island, TX has a population of 2,888 and is the 8,998th largest city in the United States. The population density is 1,075 per sq mi which is 1009% higher than the Texas average and 1086% higher than the national average. The median age in South Padre Island is 60 which is approximately 75% higher than the Texas average of 34. In South Padre Island, 66% of the population over 15 years of age are married, 72% speak English and 28% speak Spanish. 32% of South Padre Island residents were born in Texas, 49% were born out of state, 0% were born outside of the United States and 19% were foreign born.