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What are the fastest-growing counties in Idaho?

Camas County (+21.7%), Canyon County (+18.1%) and Boundary County (+15.3%) grew fastest in Idaho between 2020 and 2025.

Idaho as a whole grew 9.8% between 2020 and 2025, to 2,029,733 residents.

Data as of 2025 · updated

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All 44 Idaho counties ranked

Idaho counties by population growth
RankCountyResidents 2025Change 2020–25Net migration per 1,000, 2025New homes per 1,000, 2025
1Camas County1,316+21.7%11.410.6
2Canyon County275,123+18.1%20.714.3
3Boundary County13,997+15.3%10.62.3
4Bonner County54,420+14.8%15.03.8
5Jefferson County35,297+13.6%6.38.8
6Adams County5,013+13.3%0.42.2
7Gem County21,773+13.0%11.46.6
8Teton County13,254+12.9%3.729.0
9Boise County8,545+11.5%6.312.6
10Oneida County5,085+11.4%7.15.5
11Franklin County15,889+11.2%9.44.0
12Kootenai County191,864+11.0%16.58.9
13Washington County11,583+9.7%11.76.0
14Benewah County10,508+9.7%4.85.4
15Ada County546,141+9.6%15.69.6
16Lincoln County5,603+9.1%−8.72.9
17Bonneville County135,771+8.9%8.99.0
18Payette County27,824+8.8%4.16.5
19Jerome County26,362+8.6%−4.05.4
20Custer County4,636+8.6%15.56.9
21Valley County12,831+8.4%0.520.9
22Twin Falls County97,539+7.9%7.15.4
23Butte County2,783+7.8%25.23.2
24Idaho County17,874+7.7%2.70.3
25Shoshone County14,130+7.1%10.33.6
26Cassia County26,397+6.6%−3.44.2
27Lemhi County8,474+6.5%14.05.8
28Bingham County51,153+6.4%−0.94.0
29Fremont County14,208+5.9%−14.511.0
30Minidoka County22,911+5.7%4.86.8
31Bear Lake County6,727+5.7%6.519.0
32Latah County41,842+5.6%−5.55.7
33Owyhee County12,661+5.6%−11.82.8
34Gooding County16,446+5.1%−4.32.2
35Bannock County91,591+4.9%2.76.5
36Blaine County25,517+4.8%−12.34.4
37Lewis County3,704+4.8%5.411.1
38Power County8,246+4.6%−16.50.6
39Madison County55,172+4.2%−14.015.3
40Clearwater County9,118+4.1%5.04.2
41Caribou County7,252+3.4%1.22.5
42Elmore County29,465+2.8%−11.35.6
43Nez Perce County42,905+1.8%4.06.3
–Clark County783–––

Ranked by the change in Census Bureau population estimates, 2020–2025. 1 county is listed last and not ranked: fewer than 1,000 residents, or no estimate for the same years.

Statewide totals

More county rankings for Idaho

Metro areas

Fastest-growing metro areas in Idaho · Fastest-growing metro areas in the U.S. · Largest metro areas in Idaho

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Questions

Is Idaho growing?

Idaho as a whole grew 9.8% between 2020 and 2025, to 2,029,733 residents. Statewide figures add up its counties.

What is the fastest-growing county in Idaho?

Camas County, which grew 21.7% between 2020 and 2025 to 1,316 residents (Census Bureau population estimates). Canyon County (+18.1%) and Boundary County (+15.3%) came next.

Which Idaho counties are losing population?

None of the 43 ranked counties lost residents between 2020 and 2025.

Where are people moving in Idaho?

For their size, Butte County (25.2 per 1,000 residents), Canyon County (20.7 per 1,000 residents) and Kootenai County (16.5 per 1,000 residents) drew the most net domestic migration (people moving in from other U.S. counties minus people moving out) in 2025.

Fastest-growing counties in other states

Across the U.S.

Sources and method

Each number shows its own period. Changes compare the latest period with five years earlier (or the earliest period available). Beacon CRE last refreshed these figures on 2026-11-05. Figures come from public federal statistics and are informational only, not investment advice. Check the source before relying on a number. Methodology: how we compute every number. More on every layer: data sources and licences.