Idaho Population By County in 2018
Updated on June 22, 2021.

According to the US Census Bureau population estimates, there were 1,750,536 people living in Idaho in 2018. Ada County was the most populated county with 468,764 residents, followed by Canyon County with 223,236 residents, and Kootenai County with 161,209 residents. Clark County with a population of 851 was the least populated county in Idaho in 2018.

Use the map below to interactively explore the population of each county in Idaho in 2018. The data can also be explored further by sorting and filtering with the table below.

Hover/Click on the counties to see the values.
Idaho Population By County (2018)
See also Population estimate for other years:
Table of Idaho Population By County in 2018
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County Population % of State Population
Ada 468,764 26.78%
Adams 4,234 0.24%
Bannock 86,674 4.95%
Bear Lake 6,044 0.35%
Benewah 9,218 0.53%
Bingham 46,129 2.64%
Blaine 22,771 1.30%
Boise 7,655 0.44%
Bonner 44,705 2.55%
Bonneville 116,444 6.65%
Boundary 12,016 0.69%
Butte 2,587 0.15%
Camas 1,121 0.06%
Canyon 223,236 12.75%
Caribou 7,037 0.40%
Cassia 23,791 1.36%
Clark 851 0.05%
Clearwater 8,758 0.50%
Custer 4,250 0.24%
Elmore 27,362 1.56%
Franklin 13,704 0.78%
Fremont 13,155 0.75%
Gem 17,587 1.00%
Gooding 15,116 0.86%
Idaho 16,476 0.94%
Jefferson 29,405 1.68%
Jerome 24,066 1.38%
Kootenai 161,209 9.21%
Latah 39,829 2.28%
Lemhi 7,932 0.45%
Lewis 3,832 0.22%
Lincoln 5,398 0.31%
Madison 39,261 2.24%
Minidoka 20,719 1.18%
Nez Perce 40,256 2.30%
Oneida 4,462 0.26%
Owyhee 11,669 0.67%
Payette 23,507 1.34%
Power 7,700 0.44%
Shoshone 12,790 0.73%
Teton 11,651 0.67%
Twin Falls 86,029 4.91%
Valley 11,021 0.63%
Washington 10,115 0.58%