Idaho's Population Growth Concentrated in Urban Counties and MSAs

Census data shows 80% of Idaho counties grew in 2025, led by urban hubs like Boise and Coeur d'Alene

Apr. 1, 2026 at 8:25pm

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According to the latest U.S. Census Bureau data, 36 of Idaho's 44 counties saw population growth in 2025, with 20 growing faster than the previous year. The state's urban counties and metropolitan areas accounted for the majority of this growth, with Ada, Canyon, and Kootenai counties collectively adding over 22,000 new residents. Meanwhile, rural counties experienced slower growth or even declines, highlighting the uneven distribution of population changes across the state.

Why it matters

The census data provides valuable insights into Idaho's demographic shifts, which have important implications for urban planning, resource allocation, and economic development. The concentration of growth in urban hubs like Boise and Coeur d'Alene suggests these areas will continue to face challenges around housing, infrastructure, and public services, while rural communities may struggle to retain and attract residents.

The details

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 - Ada, Canyon, and Kootenai - accounted for over 75% of the state's annual population growth and more than 22,000 new residents. In contrast, eight of Idaho's rural counties experienced minor population declines in 2025, resulting in a combined loss of 700 residents. Three counties - Clearwater, Lewis, and Elmore - have reported consecutive population declines since 2023.

  • In 2025, 36 of Idaho's 44 counties grew in population.
  • 20 of Idaho's counties grew faster in 2025 than in 2024.
  • From 2020-2025, the highest growth rates were in Camas, Canyon, and Boundary counties at over 15%.

The players

U.S. Census Bureau

The federal agency responsible for collecting and publishing demographic data, including the annual population estimates for Idaho's counties and metropolitan areas.

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The takeaway

The census data highlights the ongoing urbanization of Idaho, with the state's population growth concentrated in its major metropolitan areas and urban counties. This trend poses challenges for policymakers and planners as they work to manage growth, allocate resources, and support the vitality of both urban and rural communities across the state.