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County | 2024 Pop. | Change (2020) | Area (mi²) | Density (/mi²) | Location |
---|---|---|---|---|---|
Ada County | 530,342 | 6.43% | 406 | 504 | |
Canyon County | 264,456 | 13.49% | 227 | 451 | |
Kootenai County | 186,730 | 8.07% | 478 | 151 | |
Bonneville County | 133,189 | 6.78% | 720 | 71 | |
Twin Falls County | 96,491 | 6.77% | 742 | 50 | |
Bannock County | 91,175 | 4.47% | 429 | 82 | |
Madison County | 54,136 | 2.28% | 181 | 115 | |
Bonner County | 53,687 | 13.26% | 669 | 31 | |
Bingham County | 50,817 | 5.66% | 808 | 24 | |
Nez Perce County | 43,065 | 2.18% | 327 | 51 | |
Latah County | 41,678 | 5.15% | 415 | 39 | |
Jefferson County | 35,060 | 12.81% | 422 | 32 | |
Elmore County | 30,057 | 4.84% | 1.2K | 10 | |
Payette County | 27,629 | 7.97% | 157 | 68 | |
Cassia County | 25,748 | 3.99% | 990 | 10 | |
Jerome County | 25,714 | 5.95% | 231 | 43 | |
Blaine County | 25,181 | 3.42% | 1K | 10 | |
Minidoka County | 22,752 | 5% | 292 | 30 | |
Gem County | 21,688 | 12.54% | 216 | 39 | |
Idaho County | 18,143 | 9.33% | 3.3K | 2 | |
Gooding County | 16,243 | 3.8% | 281 | 22 | |
Franklin County | 15,818 | 10.75% | 256 | 24 | |
Fremont County | 14,375 | 7.12% | 720 | 8 | |
Shoshone County | 14,117 | 6.96% | 1K | 5 | |
Boundary County | 13,842 | 14.03% | 490 | 11 | |
Valley County | 12,838 | 8.41% | 1.4K | 4 | |
Owyhee County | 12,799 | 6.69% | 3K | 2 | |
Teton County | 12,579 | 7.19% | 173 | 28 | |
Washington County | 11,703 | 10.84% | 561 | 8 | |
Benewah County | 10,447 | 9.1% | 300 | 13 | |
Clearwater County | 9,393 | 7.35% | 948 | 4 | |
Boise County | 8,674 | 13.18% | 733 | 5 | |
Lemhi County | 8,598 | 7.99% | 1.8K | 2 | |
Power County | 8,370 | 6.23% | 542 | 6 | |
Caribou County | 7,238 | 3.21% | 681 | 4 | |
Bear Lake County | 6,802 | 6.83% | 377 | 7 | |
Lincoln County | 5,515 | 7.42% | 464 | 5 | |
Oneida County | 5,166 | 13.14% | 463 | 4 | |
Adams County | 5,015 | 13.26% | 526 | 4 | |
Custer County | 4,528 | 6.02% | 1.9K | 1 | |
Lewis County | 3,753 | 6.41% | 185 | 8 | |
Butte County | 2,818 | 9.06% | 863 | 1 | |
Camas County | 1,295 | 19.46% | 415 | 1 | |
Clark County | 792 | 0% | 681 | 0.45 |
There are 44 counties in Idaho. As of 2019, Idaho's most populous county is Ada County, home of Boise, with 469,966 residents. This represents a population growth of 19.48% since the 2010 census. Ada County is followed by Canyon County (223,499), Kootenai County (161,505), and Bonneville County (116,854). These are the only counties in Idaho with a population exceeding 100,000. Of these counties, Ada County experienced the highest population growth.
The least populated county in Idaho is Clark County with a population of 852 in 2019, down 13.06% since the last census. There are 15 counties in Idaho with fewer than 10,000 residents. Other small counties in Idaho are Camas County (1,127), Butte County (2,611), Lewis County (3,861), Adams County (4,250), Custer County (4,280), and Oneida County (4,488). Of these counties, Clark County experienced the most dramatic decline with a population growth rate of -13.06%. Adams County experienced the highest growth with a population that grew by 7.27% since the census.
Ada County, the largest county in Idaho, also experienced the most rapid growth over the last decade, climbing 19.48% to 469,966 people. Other cities that have experienced rapid growth include Canyon County (18.03%), Kootenai County (16.31%), Teton County (14.67%), Valley County (12.80%), and Jefferson County (12.27%). Only 8 counties in Idaho experienced negative growth since the census. The most dramatic decline was in Clark County, which dropped 13.06%, followed by Butte County at -10.43%. No other county experienced decline of more than 2%.
State | Counties |
---|---|
Texas | 254 |
Georgia | 159 |
Virginia | 133 |
Kentucky | 120 |
Missouri | 115 |
Kansas | 105 |
Illinois | 102 |
North Carolina | 100 |
Iowa | 99 |
Tennessee | 95 |
Nebraska | 93 |
Indiana | 92 |
Ohio | 88 |
Minnesota | 87 |
Michigan | 83 |
Mississippi | 82 |
Puerto Rico | 78 |
Oklahoma | 77 |
Arkansas | 75 |
Wisconsin | 72 |
Alabama | 67 |
Florida | 67 |
Pennsylvania | 67 |
South Dakota | 66 |
Colorado | 64 |
Louisiana | 64 |
New York | 62 |
California | 58 |
Montana | 56 |
West Virginia | 55 |
North Dakota | 53 |
South Carolina | 46 |
Idaho | 44 |
Washington | 39 |
Oregon | 36 |
New Mexico | 33 |
Alaska | 30 |
Utah | 29 |
Maryland | 24 |
Wyoming | 23 |
New Jersey | 21 |
Nevada | 17 |
Maine | 16 |
Arizona | 15 |
Massachusetts | 14 |
Vermont | 14 |
New Hampshire | 10 |
Connecticut | 9 |
Hawaii | 5 |
Rhode Island | 5 |
Delaware | 3 |
District of Columbia | 1 |