Lower Grand Lagoon, FL has a population of 3,461 and is the 8,097th largest city in the United States. The population density is 1,648 per sq mi which is 461% higher than the Florida average and 1719% higher than the national average. The median age in Lower Grand Lagoon is 50 which is approximately 20% higher than the Florida average of 42. In Lower Grand Lagoon, 53% of the population over 15 years of age are married, 94% speak English and 3% speak Spanish. 21% of Lower Grand Lagoon residents were born in Florida, 72% were born out of state, 2% were born outside of the United States and 5% were foreign born.