Lauderdale-by-the-Sea is a town located in Broward County, Florida. Lauderdale-by-the-Sea has a 2026 population of 6,365. Lauderdale-by-the-Sea is currently growing at a rate of 1.32% annually and its population has increased by 2.94% since the most recent census, which recorded a population of 6,183 in 2020.