Polk City, FL has a population of 2,132 and is the 10,647th largest city in the United States. The population density is 475 per sq mi which is 62% higher than the Florida average and 425% higher than the national average. The median age in Polk City is 39 which is approximately 6% lower than the Florida average of 42. In Polk City, 59% of the population over 15 years of age are married, 87% speak English and 12% speak Spanish. 45% of Polk City residents were born in Florida, 47% were born out of state, 5% were born outside of the United States and 3% were foreign born.