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According to the 2020 United States census, Lake Worth Beach, Florida had a population of 42,219, making it the ninth largest city in Palm Beach County. This was a 20.9% increase from the 2010 census, which was the seventh-highest increase in the county. The increase was driven by a 158.5% increase in the number of people identifying as "other", which made up more than 19% of the city's population.