Lakeside, FL has a population of 31,201 and is the 1,362nd largest city in the United States. The population density is 2,320 per sq mi which is 466% higher than the Florida average and 2461% higher than the national average. The median age in Lakeside is 39 which is approximately 6% lower than the Florida average of 42. In Lakeside, 55% of the population over 15 years of age are married, 91% speak English and 6% speak Spanish. 38% of Lakeside residents were born in Florida, 53% were born out of state, 4% were born outside of the United States and 5% were foreign born.