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Understand Idaho

Idaho population growth rate

1.4%

Annual change in Idaho's resident population, 2025 (estimate)

−0.1 pts since 2024 (1.5%); −2.1 pts since 2020 (3.5%)

Source: U.S. Census Bureau, Population growth rate (computed by Understand Idaho). Data period 2025. Status: estimate. Published May 14, 2026. Retrieved September 8, 2026.

What the number tells us

Annual change in Idaho's resident population: 1.4% in 2025 (an estimate). Percent change in the July 1 resident population from the previous year, computed from the Census Bureau's annual estimates.

Among 51 states and the District of Columbia, Idaho ranked 2nd highest in 2025. South Carolina was highest at 1.5% and Vermont lowest at −0.3%.

Among 44 Idaho counties in 2025, Canyon County was highest at 2.9% and Power County lowest at −1.0%.

The United States figure for 2025 was 0.5%.

Historical data

Idaho population growth rate, 2011 to 2025Idaho population growth rate, 2011 to 2025. 2 series. Idaho: 0.8% in 2011, 1.4% in 2025.0.0%1.0%2.0%3.0%4.0%201520202025IdahoUnited StatesPercent

Source: U.S. Census Bureau, Population growth rate (computed by Understand Idaho). Published May 14, 2026. Retrieved September 8, 2026.

Data table (15 rows)
PeriodIdaho (percent)United States (percent)
20110.8%0.7%
20120.7%0.7%
20131.0%0.7%
20141.2%0.7%
20151.2%0.7%
20161.9%0.7%
20172.1%0.6%
20181.9%0.5%
20192.1%0.5%
20203.5%1.0%
20213.0%0.2%
20222.0%0.6%
20231.4%0.8%
20241.5%1.0%
20251.4%0.5%

By county

44 of 44 counties have a value for 2025. Idaho statewide on the same basis: 1.4%.

Idaho population growth rate by county, 2025Idaho population growth rate by county, 2025. 44 bars, from Canyon (2.9%) to Power (−1.0%).Canyon2.9%Camas2.3%Butte2.1%Ada2.0%Kootenai1.8%Bonneville1.5%Gem1.5%Bonner1.4%Franklin1.4%Oneida1.4%Jefferson1.3%Custer1.2%Teton1.1%Twin Falls1.1%Boundary1.0%Lemhi0.8%Minidoka0.8%Washington0.8%Bannock0.7%Cassia0.7%Shoshone0.7%Boise0.5%Payette0.5%Bear Lake0.4%Bingham0.4%Caribou0.4%Madison0.4%Gooding0.3%Jerome0.3%Benewah0.2%Latah0.2%Adams0.1%Clark0.1%Valley0.1%Idaho0.0%Nez Perce0.0%Lewis−0.2%Clearwater−0.3%Elmore−0.4%Lincoln−0.5%Blaine−0.7%Owyhee−0.8%Fremont−1.0%Power−1.0%

Source: U.S. Census Bureau, Population growth rate (computed by Understand Idaho). Data period 2025. Published May 14, 2026. Retrieved September 8, 2026.

Data table (44 rows)
County2025
Canyon County2.9%
Camas County2.3%
Butte County2.1%
Ada County2.0%
Kootenai County1.8%
Bonneville County1.5%
Gem County1.5%
Bonner County1.4%
Franklin County1.4%
Oneida County1.4%
Jefferson County1.3%
Custer County1.2%
Teton County1.1%
Twin Falls County1.1%
Boundary County1.0%
Lemhi County0.8%
Minidoka County0.8%
Washington County0.8%
Bannock County0.7%
Cassia County0.7%
Shoshone County0.7%
Boise County0.5%
Payette County0.5%
Bear Lake County0.4%
Bingham County0.4%
Caribou County0.4%
Madison County0.4%
Gooding County0.3%
Jerome County0.3%
Benewah County0.2%
Latah County0.2%
Adams County0.1%
Clark County0.1%
Valley County0.1%
Idaho County0.0%
Nez Perce County0.0%
Lewis County−0.2%
Clearwater County−0.3%
Elmore County−0.4%
Lincoln County−0.5%
Blaine County−0.7%
Owyhee County−0.8%
Fremont County−1.0%
Power County−1.0%

Compared with other states

Idaho, its six neighboring states, the United States, and the three highest and lowest states in 2025. The table lists all 52.

Idaho population growth rate compared with other states, 2025Idaho population growth rate compared with other states, 2025. 13 bars, from South Carolina (1.5%) to Vermont (−0.3%).South Carolina1.5%Idaho1.4%North Carolina1.3%Utah1.0%Nevada0.9%Washington0.9%Montana0.6%United States0.5%Wyoming0.3%Oregon0.2%New Mexico−0.1%West Virginia−0.1%Vermont−0.3%

Source: U.S. Census Bureau, Population growth rate (computed by Understand Idaho). Data period 2025. Published May 14, 2026. Retrieved September 8, 2026.

Data table (52 rows)
State2025
1. South Carolina1.5%
2. Idaho1.4%
3. North Carolina1.3%
4. Texas1.2%
5. Utah1.0%
6. Arizona0.9%
7. Delaware0.9%
8. Georgia0.9%
9. Nevada0.9%
10. South Dakota0.9%
11. Tennessee0.9%
12. Washington0.9%
13. Florida0.8%
14. North Dakota0.8%
15. Virginia0.7%
16. Alabama0.6%
17. Arkansas0.6%
18. Indiana0.6%
19. Minnesota0.6%
20. Montana0.6%
21. Nebraska0.6%
22. Oklahoma0.6%
23. Kentucky0.5%
24. Maine0.5%
25. New Hampshire0.5%
26. United States0.5%
27. Colorado0.4%
28. Connecticut0.4%
29. Kansas0.4%
30. Missouri0.4%
31. New Jersey0.4%
32. Rhode Island0.4%
33. District of Columbia0.3%
34. Maryland0.3%
35. Michigan0.3%
36. Ohio0.3%
37. Wisconsin0.3%
38. Wyoming0.3%
39. Iowa0.2%
40. Massachusetts0.2%
41. Oregon0.2%
42. Alaska0.1%
43. Illinois0.1%
44. Louisiana0.1%
45. Mississippi0.1%
46. Pennsylvania0.1%
47. California−0.0%
48. New York0.0%
49. Hawaii−0.1%
50. New Mexico−0.1%
51. West Virginia−0.1%
52. Vermont−0.3%

Source

Organization
U.S. Census Bureau
Dataset
Population growth rate (computed by Understand Idaho)
Geography
Nation, states, counties, and the ten largest Idaho incorporated places
Time coverage
2010-2025
Update frequency
Annual
Published
May 14, 2026
Retrieved
September 8, 2026
Original file
https://www2.census.gov/programs-surveys/popest/datasets/2020-2025/counties/totals/co-est2025-alldata.csv
License
Public domain. U.S. federal government work.
Our copy
derived-population-growth_rate, built by lib/derived.ts

Caveats

  • Computed by Understand Idaho from Population Estimates Program, Vintage 2025 (with Vintage 2019 for 2010-2019); it is not a figure the publisher releases.
  • Population totals for 2010-2019 are the Vintage 2019 intercensal series (nst-est2019-alldata.csv and co-est2019-alldata.csv), the Census Bureau's final pre-2020-Census estimates, released 2019-12-30 (states/nation) and 2020-03-26 (counties). Totals for 2020-2025 are the Vintage 2025 series (NST-EST2025-ALLDATA.csv and co-est2025-alldata.csv), released 2026-01-27 (states/nation) and 2026-03-26 (counties). The two series are built independently around the 2010 and 2020 Censuses respectively and are not reconciled to each other, so a value for 2019 and a value for 2020 at the same geography can show an implausible jump or drop that is a seam between series, not real population change.
  • City (incorporated place) totals cover 2020-2025 only, from the Vintage 2025 sub-county file (sub-est2025_16.csv), released 2026-05-14; no 2010-2019 city series is included.
  • Components of change (births, deaths, natural change, domestic migration, international migration, net migration) are published only for the nation, Idaho, and Idaho's 44 counties, not for the other 49 states, matching what this site pulls.
  • The component period for estimate year Y normally runs from July 1 of year Y-1 to June 30 of year Y. The single exception is 2020: its components run from April 1, 2020 (Census Day) to June 30, 2020, a 3-month stub, because it is the first estimate after the 2020 Census; every 2020 component observation carries a note saying so.
  • 2010-2019 files label the births-minus-deaths column NATURALINC; 2020-2025 files label it NATURALCHG. Both are mapped to metric population.natural_change; the underlying definition (births minus deaths over the period) is unchanged.
  • The ten largest Idaho places are Boise City, Meridian, Nampa, Caldwell, Idaho Falls, Pocatello, Coeur d'Alene, Twin Falls, Post Falls and Rexburg, ranked by each place's own 2025 Vintage 2025 estimate; their place FIPS codes were read directly from sub-est2025_16.csv, not assumed.
  • Group quarters estimates, the RESIDUAL column, and the published birth/death/migration rates (per 1,000 population) are not pulled.
  • Puerto Rico, which appears in the national/state files as SUMLEV 040 STATE 72, is skipped because it is not in data/geographies.json.

Inputs: Population Estimates Program, Vintage 2025 (with Vintage 2019 for 2010-2019).

Data

Download the full dataset behind this page as CSV or JSON, or browse the data catalog. Cite this page as Understand Idaho, “Idaho population growth rate”, https://understandidaho.com/population/growth/, retrieved on the date you read it.