Fort Pierce, FL has a population of 43,883 and is the 932nd largest city in the United States. The population density is 1,886 per sq mi which is 542% higher than the Florida average and 1982% higher than the national average. The median age in Fort Pierce is 37 which is approximately 11% lower than the Florida average of 42. In Fort Pierce, 46% of the population over 15 years of age are married, 72% speak English and 20% speak Spanish. 48% of Fort Pierce residents were born in Florida, 31% were born out of state, 1% were born outside of the United States and 19% were foreign born.