Is Idaho's population growing or shrinking?
Refreshed annually
It grew by 28,900 between 2024 and 2025. That’s more than the population of the city of Moscow. Changes in population reflect birth and death rates, immigration patterns, regional shifts, and even the overall health of the economy. Idaho’s 1.4% annual increase was primarily driven by people moving from other states. In the decade between 2015 and 2025, Idaho’s population grew by 22%.
+28.9K
population change (2024 to 2025)
+1.4%
percent change in population (2024 to 2025)
Since 2000, Idaho's population increased in 25 of 25 years. The largest increase occurred between 2020 and 2021, when it gained 55,500 residents. The state's smallest increase during the 21st century occurred between 2011 and 2012 when it gained 13,700 residents.
Idaho gained 28,900 residents between 2024 and 2025.
Annual population change, 1901–2025
What contributes to population change in Idaho?
A state’s population is influenced by three factors:
- Natural population change: If births outnumber deaths in a given year, natural population growth is positive. If deaths exceed births, it is negative. Between 2024 to 2025 natural population change was positive in Idaho, with births exceeding deaths by 6,900.
- Immigration: international migration directly into or out of a state. If more people move in than move out, population change from immigration is positive. If more people move out than move in, it’s negative. Idaho’s population change from immigration was positive, with about 2,100 more people coming from another country to Idaho than leaving.
- Domestic migration, moving between states: Idaho’s population change from domestic migration was positive, with about 19,900 more people moving to Idaho from other states than leaving.
Between 2024 and 2025, domestic migration was the primary driver of population growth in Idaho.
Components of population change, 2011–2025
Which counties in Idaho are growing? Which are shrinking?
Among 44 county equivalents, Ada County had the largest population growth in Idaho, welcoming 10,916 new residents. Blaine County lost the most, with a loss of 184 residents. County-level population data is available as of 2025.
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Canyon County led Idaho in percent population increase between 2024 and 2025 at 2.9 percent. Power County ranked last with a 1 percent decline.
Between 2024 and 2025, Canyon County gained 2.9% in population, the largest increase in Idaho.
Population change
How does population change in Idaho compare to other states?
Between 2015 and 2025, Idaho’s population has increased by 22%. During that same period, the US population grew by 6.2%. Idaho ranks 1st among states in population growth over that decade.
Idaho ranked first in population growth between 2015 and 2025.
Percent change in population
Population change between 2024 and 2025, by county in Idaho
| County | Population change rate | |
|---|---|---|
| 1. | Canyon County, ID | +2.9% |
| 2. | Camas County, ID | +2.3% |
| 3. | Butte County, ID | +2.1% |
| 4. | Ada County, ID | +2% |
| 5. | Kootenai County, ID | +1.8% |
| 6. | Gem County, ID | +1.5% |
| 7. | Bonneville County, ID | +1.5% |
| 8. | Franklin County, ID | +1.4% |
| 9. | Bonner County, ID | +1.4% |
| 10. | Oneida County, ID | +1.4% |
Population change between 2015 and 2025, by state
| State | Population change rate | |
|---|---|---|
| 1. | Idaho | +22% |
| 2. | Utah | +17.9% |
| 3. | Florida | +16.5% |
| 4. | Texas | +15.8% |
| 5. | Nevada | +14.9% |
| 6. | South Carolina | +14.8% |
| 7. | Arizona | +13.7% |
| 8. | North Carolina | +12.4% |
| 9. | Delaware | +12.2% |
| 10. | Washington state | +11.4% |
How is the US population changing?
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Methodology
USAFacts standardizes data, in areas such as time and demographics, to make it easier to understand and compare.
Page sources
USAFacts endeavors to share the most up-to-date information available. We sourced the data on this page directly from government agencies; however, the intervals at which agencies publish updated data vary.
