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Large Sun Belt counties continue to post nation's strongest population gains

Slower international migration may impact rankings this year
Miami-Dade County in Florida posted the second-highest population gain last year among U.S. counties. (Getty)<br>
Miami-Dade County in Florida posted the second-highest population gain last year among U.S. counties. (Getty)
CoStar Analytics
March 18, 2025 | 1:09 P.M.

Harris County, Texas, Miami-Dade County, Florida, and Maricopa County, Arizona, have seen some of the strongest population growth over the last few years, and they topped the charts once more in 2024.

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