Idaho county populations
44 supported county-equivalent records in Idaho; July 1, 2025 population, 2024–2025 growth and 2025 land-area density.
Population totals use July 1, 2025 observations from PEP Vintage 2025. Change is measured since July 1, 2024. County equivalents are included, including Connecticut planning regions. Missing density is displayed as unavailable, never as zero.
Population table and filters
Whole-dataset downloads| Place | Population · 2025 | Change · 2024–25 | Growth · 2024–25 | People / sq. mi. |
|---|---|---|---|---|
| Ada CountyIdaho · County equivalent · 16001 | 546,141 | +10,916 | +2.04% | 519.0 |
| Canyon CountyIdaho · County equivalent · 16027 | 275,123 | +7,679 | +2.87% | 468.7 |
| Kootenai CountyIdaho · County equivalent · 16055 | 191,864 | +3,466 | +1.84% | 155.0 |
| Bonneville CountyIdaho · County equivalent · 16019 | 135,771 | +1,978 | +1.48% | 72.8 |
| Twin Falls CountyIdaho · County equivalent · 16083 | 97,539 | +1,072 | +1.11% | 50.8 |
| Bannock CountyIdaho · County equivalent · 16005 | 91,591 | +622 | +0.68% | 82.3 |
| Madison CountyIdaho · County equivalent · 16065 | 55,172 | +224 | +0.41% | 117.6 |
| Bonner CountyIdaho · County equivalent · 16017 | 54,420 | +770 | +1.44% | 31.4 |
| Bingham CountyIdaho · County equivalent · 16011 | 51,153 | +187 | +0.37% | 24.4 |
| Nez Perce CountyIdaho · County equivalent · 16069 | 42,905 | +11 | +0.03% | 50.6 |
| Latah CountyIdaho · County equivalent · 16057 | 41,842 | +104 | +0.25% | 38.9 |
| Jefferson CountyIdaho · County equivalent · 16051 | 35,297 | +441 | +1.27% | 32.3 |
| Elmore CountyIdaho · County equivalent · 16039 | 29,465 | -110 | -0.37% | 9.6 |
| Payette CountyIdaho · County equivalent · 16075 | 27,824 | +145 | +0.52% | 68.4 |
| Cassia CountyIdaho · County equivalent · 16031 | 26,397 | +187 | +0.71% | 10.3 |
| Jerome CountyIdaho · County equivalent · 16053 | 26,362 | +74 | +0.28% | 44.1 |
| Blaine CountyIdaho · County equivalent · 16013 | 25,517 | -184 | -0.72% | 9.7 |
| Minidoka CountyIdaho · County equivalent · 16067 | 22,911 | +184 | +0.81% | 30.3 |
| Gem CountyIdaho · County equivalent · 16045 | 21,773 | +323 | +1.51% | 38.9 |
| Idaho CountyIdaho · County equivalent · 16049 | 17,874 | +1 | +0.01% | 2.1 |
| Gooding CountyIdaho · County equivalent · 16047 | 16,446 | +47 | +0.29% | 22.5 |
| Franklin CountyIdaho · County equivalent · 16041 | 15,889 | +227 | +1.45% | 24.0 |
| Fremont CountyIdaho · County equivalent · 16043 | 14,208 | -138 | -0.96% | 7.6 |
| Shoshone CountyIdaho · County equivalent · 16079 | 14,130 | +104 | +0.74% | 5.4 |
| Boundary CountyIdaho · County equivalent · 16021 | 13,997 | +141 | +1.02% | 11.0 |
| Teton CountyIdaho · County equivalent · 16081 | 13,254 | +149 | +1.14% | 29.5 |
| Valley CountyIdaho · County equivalent · 16085 | 12,831 | +14 | +0.11% | 3.5 |
| Owyhee CountyIdaho · County equivalent · 16073 | 12,661 | -103 | -0.81% | 1.7 |
| Washington CountyIdaho · County equivalent · 16087 | 11,583 | +91 | +0.79% | 8.0 |
| Benewah CountyIdaho · County equivalent · 16009 | 10,508 | +22 | +0.21% | 13.5 |
| Clearwater CountyIdaho · County equivalent · 16035 | 9,118 | -31 | -0.34% | 3.7 |
| Boise CountyIdaho · County equivalent · 16015 | 8,545 | +39 | +0.46% | 4.5 |
| Lemhi CountyIdaho · County equivalent · 16059 | 8,474 | +66 | +0.78% | 1.9 |
| Power CountyIdaho · County equivalent · 16077 | 8,246 | -87 | -1.04% | 5.9 |
| Caribou CountyIdaho · County equivalent · 16029 | 7,252 | +30 | +0.42% | 4.1 |
| Bear Lake CountyIdaho · County equivalent · 16007 | 6,727 | +24 | +0.36% | 6.9 |
| Lincoln CountyIdaho · County equivalent · 16063 | 5,603 | -28 | -0.50% | 4.7 |
| Oneida CountyIdaho · County equivalent · 16071 | 5,085 | +69 | +1.38% | 4.2 |
| Adams CountyIdaho · County equivalent · 16003 | 5,013 | +3 | +0.06% | 3.7 |
| Custer CountyIdaho · County equivalent · 16037 | 4,636 | +54 | +1.18% | 0.9 |
| Lewis CountyIdaho · County equivalent · 16061 | 3,704 | -9 | -0.24% | 7.7 |
| Butte CountyIdaho · County equivalent · 16023 | 2,783 | +57 | +2.09% | 1.2 |
| Camas CountyIdaho · County equivalent · 16025 | 1,316 | +29 | +2.25% | 1.2 |
| Clark CountyIdaho · County equivalent · 16033 | 783 | +1 | +0.13% | 0.4 |
Use these comparisons consistently
A larger population does not necessarily mean faster growth. Absolute change measures the number of residents gained or lost; percentage change divides that difference by the starting population. The percentage column here covers one July-to-July interval, rather than a decade or a partial calendar year. Percent growth is suppressed where the starting population is zero.
Density divides the unrounded July 1, 2025 population by matching 2025 Gazetteer land area. It is measured in people per square mile and excludes water area. These geographic averages depend on the size and definition of each unit, so a county’s density is not directly comparable to a built-up city neighborhood.
County-equivalent names and units vary by state. Connecticut planning regions are represented in the current series; linking older county series requires a documented relationship. Incorporated places may cross county boundaries and do not form an exhaustive county breakdown.
Exports contain the current page’s visible rows after filtering, with reference date and release metadata. Use whole-dataset downloads for every row or select a compatible comparison to inspect a longer interval. The initial pep-2025-r1 snapshot remains reproducible when future releases are added.