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Counties in Idaho, United States

County Name Population Water Area
Percentage
Land Area
Percentage
Ada County, ID 300,904  0.5%  99.5% 
Adams County, ID 3,476  0.4%  99.6% 
Bannock County, ID 75,565  2.98%  97.02% 
Bear Lake County, ID 6,411  7.44%  92.56% 
Benewah County, ID 9,171  1.01%  98.99% 
Bingham County, ID 41,735  1.2%  98.8% 
Blaine County, ID 18,991  0.61%  99.39% 
Boise County, ID 6,670  0.23%  99.77% 
Bonner County, ID 36,835  9.48%  90.52% 
Bonneville County, ID 82,522  1.69%  98.31% 
Boundary County, ID 9,871  0.74%  99.26% 
Butte County, ID 2,899  0.03%  99.97% 
Camas County, ID 991  0.38%  99.62% 
Canyon County, ID 131,441  2.28%  97.72% 
Caribou County, ID 7,304  1.81%  98.19% 
Cassia County, ID 21,416  0.54%  99.46% 
Clark County, ID 1,022  0.03%  99.97% 
Clearwater County, ID 8,930  1.07%  98.93% 
Custer County, ID 4,342  0.23%  99.77% 
Elmore County, ID 29,130  0.74%  99.26% 
Franklin County, ID 11,329  0.44%  99.56% 
Fremont County, ID 11,819  1.52%  98.48% 
Gem County, ID 15,181  0.56%  99.44% 
Gooding County, ID 14,155  0.42%  99.58% 
Idaho County, ID 15,511  0.21%  99.79% 
Jefferson County, ID 19,155  0.95%  99.05% 
Jerome County, ID 18,342  0.34%  99.66% 
Kootenai County, ID 108,685  5.36%  94.64% 
Latah County, ID 34,935  0.02%  99.98% 
Lemhi County, ID 7,806  0.12%  99.88% 
Lewis County, ID 3,747  0.16%  99.84% 
Lincoln County, ID 4,044  0.03%  99.97% 
Madison County, ID 27,467  0.39%  99.61% 
Minidoka County, ID 20,174  0.44%  99.56% 
Nez Perce County, ID 37,410  0.85%  99.15% 
Oneida County, ID 4,125  0.11%  99.89% 
Owyhee County, ID 10,644  0.24%  99.76% 
Payette County, ID 20,578  0.65%  99.35% 
Power County, ID 7,538  2.57%  97.43% 
Shoshone County, ID 13,771  0.06%  99.94% 
Teton County, ID 5,999  0.05%  99.95% 
Twin Falls County, ID 64,284  0.18%  99.82% 
Valley County, ID 7,651  1.5%  98.5% 
Washington County, ID 9,977  1.17%  98.83% 


State Information Safety and Environment
Official Site of Idaho
State Population: 1,634,464
Idaho Counties
Natural Resource Office