Idaho Citizen Voting-age Population By County in 2015 (ACS-5Yrs)

Updated on March 28, 2026.

Based on the US Census Bureau's special tabulation from the ACS 5-year estimates, in 2015, the citizen voting-age population for Idaho was 1,130,550 and represented 69.94% of the total Idaho population.

Among all Idaho counties, Ada had the highest citizen voting-age population (298.83K), followed by Canyon (128.23K), and Kootenai (109.39K).

In terms of percentages, Clearwater had the highest percentage of its population being citizens of voting-age (83.24%), followed by Lemhi (81.45%), and Valley (81.17%).

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 2015

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

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Idaho Citizen Voting-age Population By County in 2015

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County	Citizen Voting-age Population	% of County Population
Ada	298835	71.58
Canyon	128230	64.46
Kootenai	109390	75.42
Bonneville	71045	65.91
Bannock	59300	70.93
Twin Falls	53855	67.32
Bonner	32315	78.69
Nez Perce	30990	77.90
Latah	29910	78.01
Bingham	28820	63.47
Madison	26515	69.93
Elmore	17795	67.99
Jefferson	16540	61.74
Payette	15690	69.12
Blaine	14595	68.49
Cassia	13795	59.03
Idaho	12900	79.09
Jerome	12765	56.35
Minidoka	12760	62.92
Gem	12590	75.25
Shoshone	9945	79.12
Gooding	9220	60.52
Fremont	8770	67.75
Boundary	8190	74.73
Franklin	8115	62.83
Valley	7890	81.17
Owyhee	7345	64.63
Washington	7275	72.57
Clearwater	7125	83.24
Benewah	6990	76.90
Teton	6485	63.05
Lemhi	6345	81.45
Boise	5530	80.32
Power	4855	62.81
Caribou	4730	69.46
Bear Lake	4315	72.64
Custer	3435	81.11
Lincoln	3165	60.17
Adams	3135	80.80
Oneida	3015	71.03
Lewis	2935	77.03
Butte	1930	72.69
Camas	740	70.48
Clark	430	47.78