Willow Oak, FL has a population of 5,580 and is the 6,022nd largest city in the United States. The population density is 1,788 per sq mi which is 509% higher than the Florida average and 1874% higher than the national average. The median age in Willow Oak is 35 which is approximately 17% lower than the Florida average of 42. In Willow Oak, 37% of the population over 15 years of age are married, 71% speak English and 27% speak Spanish. 50% of Willow Oak residents were born in Florida, 31% were born out of state, 2% were born outside of the United States and 16% were foreign born.