St. Augustine Shores, FL has a population of 8,612 and is the 4,415th largest city in the United States. The population density is 1,965 per sq mi which is 569% higher than the Florida average and 2069% higher than the national average. The median age in St. Augustine Shores is 54 which is approximately 30% higher than the Florida average of 42. In St. Augustine Shores, 54% of the population over 15 years of age are married, 94% speak English and 3% speak Spanish. 26% of St. Augustine Shores residents were born in Florida, 66% were born out of state, 2% were born outside of the United States and 6% were foreign born.