Lake Worth Beach is a city in east-central Palm Beach County, Florida. The 2010 census recorded a population of 34,910, which increased to 42,219 in the 2020 census. It offers all the water-soaked fun you’re after on a Florida vacation. This seven-square-mile city is wedged between some of the most action-packed waterways in The Palm Beaches, and its revitalized downtown has its own distinct charms worth discovering.