Lake Butler, FL has a population of 18,322 and is the 2,380th largest city in the United States. The population density is 1,553 per sq mi which is 429% higher than the Florida average and 1614% higher than the national average. The median age in Lake Butler is 38 which is approximately 8% lower than the Florida average of 42. In Lake Butler, 67% of the population over 15 years of age are married, 74% speak English and 12% speak Spanish. 31% of Lake Butler residents were born in Florida, 45% were born out of state, 3% were born outside of the United States and 21% were foreign born.