Idaho Citizen Voting-age Population By County in 2016 (ACS-5Yrs)

Updated on March 28, 2026.

Based on the US Census Bureau's special tabulation from the ACS 5-year estimates, in 2016, the citizen voting-age population for Idaho was 1,148,895 and represented 70.25% of the total Idaho population.

Among all Idaho counties, Ada had the highest citizen voting-age population (307.09K), followed by Canyon (132.15K), and Kootenai (111.72K).

In terms of percentages, Clearwater had the highest percentage of its population being citizens of voting-age (84.00%), followed by Lemhi (81.54%), and Valley (81.41%).

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 2016

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

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Idaho Citizen Voting-age Population By County in 2016

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County	Citizen Voting-age Population	% of County Population
Ada	307090	72.12
Canyon	132145	65.17
Kootenai	111715	75.63
Bonneville	71840	65.91
Bannock	59380	70.85
Twin Falls	54790	67.68
Bonner	32585	78.73
Nez Perce	31185	77.97
Latah	30090	77.96
Bingham	29025	64.13
Madison	26625	69.85
Elmore	17940	68.72
Jefferson	16900	62.37
Payette	15790	69.33
Blaine	14655	68.40
Cassia	13930	59.43
Jerome	12990	57.24
Idaho	12865	79.17
Gem	12505	74.19
Minidoka	12415	61.07
Shoshone	9945	79.24
Gooding	9325	61.53
Fremont	8785	68.13
Boundary	8290	74.42
Franklin	8250	63.39
Valley	8055	81.41
Owyhee	7415	65.30
Washington	7240	72.15
Clearwater	7165	84.00
Benewah	6955	76.68
Teton	6685	64.06
Lemhi	6315	81.54
Boise	5570	80.84
Caribou	4730	69.41
Power	4705	61.14
Bear Lake	4310	72.68
Custer	3380	80.77
Adams	3140	81.24
Lincoln	3130	59.17
Oneida	3015	70.61
Lewis	2915	76.21
Butte	2020	77.99
Camas	675	69.59
Clark	425	44.27