St. James City, FL has a population of 3,667 and is the 7,830th largest city in the United States. The population density is 251 per sq mi which is 14% lower than the Florida average and 177% higher than the national average. The median age in St. James City is 65 which is approximately 56% higher than the Florida average of 42. In St. James City, 79% of the population over 15 years of age are married, 94% speak English and 3% speak Spanish. 21% of St. James City residents were born in Florida, 74% were born out of state, 0% were born outside of the United States and 5% were foreign born.