Idaho Citizen Voting-age Population By County in 2020 (ACS-5Yrs)

Updated on March 28, 2026.

Based on the US Census Bureau's special tabulation from the ACS 5-year estimates, in 2020, the citizen voting-age population for Idaho was 1,255,410 and represented 71.56% of the total Idaho population.

Among all Idaho counties, Ada had the highest citizen voting-age population (347.91K), followed by Canyon (150.91K), and Kootenai (123.30K).

In terms of percentages, Valley had the highest percentage of its population being citizens of voting-age (82.91%), followed by Adams (82.86%), and Boise (82.36%).

The chart and table below shows the citizen voting-age population of each county and the percentage of each county's population that were citizens of voting-age.

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

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Idaho Citizen Voting-age Population By County in 2020
Idaho Citizen Voting-age Population By County in 2020
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County Citizen Voting-age Population % of County Population
Ada 347905 74.11
Canyon 150905 67.40
Kootenai 123300 76.26
Bonneville 77945 66.64
Bannock 62390 71.93
Twin Falls 58140 67.45
Bonner 35415 79.25
Nez Perce 31680 78.28
Latah 31500 78.65
Bingham 30700 66.39
Madison 27935 70.32
Elmore 18950 70.07
Jefferson 18735 64.07
Payette 16520 69.69
Blaine 15875 69.84
Cassia 14840 62.24
Jerome 13540 56.24
Idaho 13255 80.29
Gem 13155 74.03
Minidoka 12905 62.00
Shoshone 10055 79.17
Gooding 9635 63.06
Valley 9190 82.91
Franklin 9145 66.58
Fremont 9145 69.76
Boundary 9125 75.07
Teton 8240 69.98
Owyhee 7875 67.16
Washington 7340 72.46
Benewah 7110 77.03
Clearwater 7065 80.88
Lemhi 6415 80.90
Boise 6280 82.36
Caribou 4795 68.21
Power 4650 60.90
Bear Lake 4415 72.92
Adams 3480 82.86
Custer 3415 81.41
Lincoln 3140 58.80
Oneida 3030 68.40
Lewis 2960 76.88
Butte 2040 78.31
Camas 810 75.70
Clark 460 51.98