Idaho Citizen Voting-age Population By County in 2017 (ACS-5Yrs)

Updated on March 28, 2026.

Based on the US Census Bureau's special tabulation from the ACS 5-year estimates, in 2017, the citizen voting-age population for Idaho was 1,168,165 and represented 70.48% of the total Idaho population.

Among all Idaho counties, Ada had the highest citizen voting-age population (316.19K), followed by Canyon (135.59K), and Kootenai (113.79K).

In terms of percentages, Custer had the highest percentage of its population being citizens of voting-age (83.45%), followed by Clearwater (82.95%), and Adams (81.88%).

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 2017

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

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Idaho Citizen Voting-age Population By County in 2017

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County	Citizen Voting-age Population	% of County Population
Ada	316190	72.67
Canyon	135590	65.50
Kootenai	113785	75.79
Bonneville	72870	66.00
Bannock	59635	70.90
Twin Falls	55350	67.30
Bonner	32925	78.66
Nez Perce	31160	77.87
Latah	30040	77.63
Bingham	29475	64.97
Madison	26875	70.28
Elmore	18120	69.08
Jefferson	17050	62.20
Payette	15795	69.16
Blaine	14780	68.47
Cassia	13900	59.23
Jerome	13065	56.71
Idaho	12980	79.75
Minidoka	12500	61.13
Gem	12405	73.62
Shoshone	9870	79.02
Gooding	9490	62.81
Fremont	8910	69.12
Boundary	8435	74.48
Franklin	8335	63.53
Valley	8200	81.15
Owyhee	7420	65.17
Teton	7160	66.45
Washington	7140	71.44
Clearwater	7080	82.95
Benewah	6950	76.80
Lemhi	6300	81.24
Boise	5655	81.13
Power	4855	63.34
Caribou	4770	69.53
Bear Lake	4295	72.31
Custer	3455	83.45
Adams	3230	81.88
Lincoln	3085	58.26
Oneida	2965	69.19
Lewis	2895	75.69
Butte	2070	79.16
Camas	620	70.06
Clark	490	46.45