Population of Counties in Idaho (2018)

Name 2018 Population Growth Since 2010
Ada County456,84916.11%
Canyon County216,69914.43%
Kootenai County157,63713.53%
Bonneville County114,5959.47%
Bannock County85,2692.70%
Twin Falls County85,1249.76%
Bingham County45,9270.35%
Bonner County43,5606.48%
Nez Perce County40,3852.71%
Latah County39,3335.59%
Madison County39,1414.11%
Jefferson County28,4468.49%
Elmore County26,823-1.11%
Cassia County23,6642.57%
Jerome County23,6275.20%
Payette County23,2152.55%
Blaine County22,0243.40%
Minidoka County20,7293.18%
Gem County17,3794.14%
Idaho County16,3690.37%
Gooding County15,124-2.19%
Franklin County13,5646.13%
Fremont County13,094-0.99%
Shoshone County12,542-1.67%
Boundary County11,9228.39%
Owyhee County11,6281.34%
Teton County11,38112.12%
Valley County10,6879.18%
Washington County10,121-0.55%
Benewah County9,184-1.14%
Clearwater County8,546-2.09%
Lemhi County7,875-0.97%
Power County7,600-3.41%
Boise County7,2904.05%
Caribou County7,0340.86%
Bear Lake County6,0280.99%
Lincoln County5,3182.15%
Oneida County4,4273.24%
Custer County4,172-4.27%
Adams County4,1474.67%
Lewis County3,8871.75%
Butte County2,602-10.74%
Camas County1,102-1.25%
Clark County873-10.92%