Idaho Voting-age Population By County in 2021 (ACS-5Yrs)

Updated on February 28, 2025.

Based on the US Census ACS-5Yrs estimates, in 2021, the voting-age population of Idaho was 1.35M which was 74.67% of the total Idaho population. Among all Idaho counties, Ada had the highest voting-age population (371.78K), followed by Canyon (163.53K), and Kootenai (129.77K).

On the other hand, the counties with the least voting-age population were: Clark (652), Camas (745), and Butte (1.98K).

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

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

Related Topics: Idaho ACS-5Yrs Estimates, 2021 Topic List.

Data Source: US Census - ACS 5-Year Estimates, 2021 Census.

Idaho Voting-age Population By County in 2021

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County	Voting-age Population	% of County Population
Ada	371775	76.62
Adams	3626	83.92
Bannock	63813	73.89
Bear Lake	4586	72.48
Benewah	7360	77.40
Bingham	32914	69.23
Blaine	18647	78.13
Boise	6357	84.21
Bonner	37275	80.19
Bonneville	84271	69.20
Boundary	9164	76.58
Butte	1983	77.07
Camas	745	71.36
Canyon	163530	71.92
Caribou	5009	71.53
Cassia	16756	68.48
Clark	652	77.71
Clearwater	7320	83.96
Custer	3550	83.08
Elmore	21155	74.50
Franklin	9523	67.85
Fremont	10003	74.82
Gem	14419	77.14
Gooding	11200	72.62
Idaho	13266	80.43
Jefferson	20089	66.02
Jerome	16720	69.43
Kootenai	129773	77.10
Latah	32036	81.18
Lemhi	6528	82.13
Lewis	2770	76.67
Lincoln	3724	71.84
Madison	37160	72.89
Minidoka	15125	70.70
Nez Perce	32762	78.34
Oneida	3278	72.62
Owyhee	8777	74.29
Payette	18384	73.75
Power	5414	68.93
Shoshone	10415	79.36
Teton	8721	75.90
Twin Falls	64642	72.53
Valley	9543	83.16
Washington	8027	77.00