Lake Kathryn, FL has a population of 1,077 and is the 14,684th largest city in the United States. The population density is 385 per sq mi which is 31% higher than the Florida average and 325% higher than the national average. The median age in Lake Kathryn is 46 which is approximately 10% higher than the Florida average of 42. In Lake Kathryn, 49% of the population over 15 years of age are married, 92% speak English and 8% speak Spanish. 53% of Lake Kathryn residents were born in Florida, 44% were born out of state, 0% were born outside of the United States and 4% were foreign born.