Kathleen, FL has a population of 6,932 and is the 5,214th largest city in the United States. The population density is 963 per sq mi which is 228% higher than the Florida average and 963% higher than the national average. The median age in Kathleen is 34 which is approximately 19% lower than the Florida average of 42. In Kathleen, 54% of the population over 15 years of age are married, 83% speak English and 15% speak Spanish. 53% of Kathleen residents were born in Florida, 36% were born out of state, 5% were born outside of the United States and 5% were foreign born.