Lake Worth, FL has a population of 36,838 and is the 1,137th largest city in the United States. The population density is 6,303 per sq mi which is 2047% higher than the Florida average and 6857% higher than the national average. The median age in Lake Worth is 36 which is approximately 13% lower than the Florida average of 42. In Lake Worth, 41% of the population over 15 years of age are married, 51% speak English and 35% speak Spanish. 35% of Lake Worth residents were born in Florida, 27% were born out of state, 3% were born outside of the United States and 34% were foreign born.