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Alaska's counties show varied growth patterns from 2020 to 2025. Matanuska-Susitna Borough leads with 10.48% annualized growth, followed by Copper River Census Area (7.27%) and Kenai Peninsula Borough (5.95%). The largest counties are Anchorage Municipality (284,259), Matanuska-Susitna Borough (118,773), and Fairbanks North Star Borough (94,116). Of the 30 counties in Alaska, 9 are growing while 21 have experienced population decline. Overall, counties averaged -2.36% annualized growth, with total population growing by 0.1% annually.