Idaho Citizen Voting-age Population By County in 2023 (ACS-5Yrs)

Updated on March 28, 2026.

Based on the US Census Bureau's special tabulation from the ACS 5-year estimates, in 2023, the citizen voting-age population for Idaho was 1,376,250 and represented 72.69% of the total Idaho population.

Among all Idaho counties, Ada had the highest citizen voting-age population (381.87K), followed by Canyon (166.66K), and Kootenai (136.03K).

In terms of percentages, Custer had the highest percentage of its population being citizens of voting-age (88.44%), followed by Boise (83.53%), and Clearwater (83.41%).

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 Population By County in 2023

Data Source: US Census - ACS 5-Year (CVAP).

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Idaho Citizen Voting-age Population By County in 2023

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County	Citizen Voting-age Population	% of County Population
Ada	381870	75.16
Canyon	166660	68.75
Kootenai	136025	76.53
Bonneville	86565	68.13
Bannock	64600	73.03
Twin Falls	64070	69.55
Madison	40580	75.74
Bonner	39210	79.28
Nez Perce	33165	78.08
Bingham	33100	67.56
Latah	31715	78.67
Jefferson	20820	64.59
Elmore	20580	70.86
Payette	18760	71.63
Blaine	17600	71.60
Cassia	15680	62.31
Gem	14865	74.87
Jerome	14260	57.52
Minidoka	14210	64.83
Idaho	13590	79.38
Shoshone	10665	78.54
Gooding	10075	64.01
Fremont	10030	73.21
Franklin	9975	67.79
Valley	9830	81.01
Boundary	9285	73.14
Teton	8480	70.08
Owyhee	8345	67.93
Washington	8020	73.82
Benewah	7710	77.76
Clearwater	7440	83.41
Boise	6720	83.53
Lemhi	6635	81.26
Caribou	5030	70.65
Power	4950	61.72
Bear Lake	4720	72.06
Custer	3900	88.44
Adams	3785	82.28
Lincoln	3415	64.74
Oneida	3410	72.86
Lewis	2835	77.67
Butte	1880	70.81
Camas	765	66.23
Clark	430	55.48