St. Lucie County's population reached 402,449 as of July 1, 2025, up from 329,226 in 2020, according to Census Bureau estimates. That's an increase of more than 73,000 residents, or 22.2%, in just over five years. For comparison, neighboring Palm Beach County grew from 1,492,191 residents in 2020 to an estimated 1,575,726 in 2025, an
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