Idaho Population By County in 2020

Updated on August 1, 2024.

Based on the US Census Vintage data estimates, in 2020, the population of Idaho was 1,849,339. Among all Idaho counties, Ada had the highest population (498,278), followed by Canyon (233,013), and Kootenai (172,785). Clark was the least populated county (792).

Hover over or click on the counties in the map below to see the populations. The data can also be found in a table below. You can use the table to sort, filter, and explore the data further.

You can see similar information for other states and by state for the United States.

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Idaho Population By County in 2020
Idaho Population By County in 2020
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County Population % of State Population
Ada 498278 26.94
Adams 4428 0.24
Bannock 87276 4.72
Bear Lake 6367 0.34
Benewah 9576 0.52
Bingham 48097 2.60
Blaine 24348 1.32
Boise 7664 0.41
Bonner 47403 2.56
Bonneville 124737 6.75
Boundary 12139 0.66
Butte 2584 0.14
Camas 1084 0.06
Canyon 233013 12.60
Caribou 7013 0.38
Cassia 24760 1.34
Clark 792 0.04
Clearwater 8750 0.47
Custer 4271 0.23
Elmore 28669 1.55
Franklin 14282 0.77
Fremont 13419 0.73
Gem 19272 1.04
Gooding 15649 0.85
Idaho 16594 0.90
Jefferson 31080 1.68
Jerome 24270 1.31
Kootenai 172785 9.34
Latah 39638 2.14
Lemhi 7962 0.43
Lewis 3527 0.19
Lincoln 5134 0.28
Madison 52928 2.86
Minidoka 21668 1.17
Nez Perce 42145 2.28
Oneida 4566 0.25
Owyhee 11996 0.65
Payette 25590 1.38
Power 7879 0.43
Shoshone 13199 0.71
Teton 11735 0.64
Twin Falls 90372 4.89
Valley 11842 0.64
Washington 10558 0.57