Stuart, FL has a population of 16,204 and is the 2,638th largest city in the United States. The population density is 2,437 per sq mi which is 730% higher than the Florida average and 2590% higher than the national average. The median age in Stuart is 48 which is approximately 16% higher than the Florida average of 42. In Stuart, 50% of the population over 15 years of age are married, 85% speak English and 10% speak Spanish. 31% of Stuart residents were born in Florida, 55% were born out of state, 2% were born outside of the United States and 11% were foreign born.