For Immediate Release: March 31, 2026
Media Contact: Will.Hoenike@labor.idaho.gov
Thirty-six of Idaho’s 44 counties grew in population in 2025, with 20 growing faster than in 2024, according to annual U.S. Census Bureau population estimates. This translates to 80% of Idaho’s counties growing in population — much higher than the nation’s share of 60%.
Five of Idaho’s urban counties — Ada, Canyon, Kootenai, Bonneville and Twin Falls — added at least 1,000 new residents in 2025. The three most populous counties of Ada, Canyon and Kootenai collectively accounted for more than 75% of the state’s annual population growth and over 22,000 new residents.
Annual population growth rates ranged from a low of -1% in Franklin and Fremont counties to a high of 2.9% in Canyon. Ada had the highest total increase of over 10,000 new residents while Blaine had the largest decline of 184.



