Idaho Citizen Voting-age Population By County in 2019 (ACS-5Yrs)

Updated on March 28, 2026.

Based on the US Census Bureau's special tabulation from the ACS 5-year estimates, in 2019, the citizen voting-age population for Idaho was 1,220,310 and represented 71.04% of the total Idaho population.

Among all Idaho counties, Ada had the highest citizen voting-age population (335.55K), followed by Canyon (144.94K), and Kootenai (119.62K).

In terms of percentages, Custer had the highest percentage of its population being citizens of voting-age (83.45%), followed by Clearwater (83.00%), and Valley (82.82%).

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 2019

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

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Idaho Citizen Voting-age Population By County in 2019

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County	Citizen Voting-age Population	% of County Population
Ada	335550	73.45
Canyon	144935	66.60
Kootenai	119620	76.04
Bonneville	76020	66.46
Bannock	61100	71.24
Twin Falls	57010	67.17
Bonner	34465	79.03
Nez Perce	31515	78.37
Latah	30570	77.38
Bingham	30330	66.17
Madison	27365	69.99
Elmore	18705	69.94
Jefferson	18070	63.33
Payette	15985	68.72
Blaine	15195	67.91
Cassia	14225	60.05
Jerome	13345	56.24
Idaho	13130	80.01
Gem	12920	74.55
Minidoka	12900	62.30
Shoshone	9985	79.18
Gooding	9530	62.90
Fremont	9010	69.20
Franklin	8870	65.87
Valley	8870	82.82
Boundary	8825	74.50
Teton	7940	69.50
Owyhee	7745	67.06
Washington	7270	72.30
Clearwater	7200	83.00
Benewah	7035	76.97
Lemhi	6255	79.73
Boise	6020	81.57
Caribou	4790	68.87
Power	4585	59.78
Bear Lake	4365	72.75
Custer	3480	83.45
Adams	3375	82.42
Lincoln	3145	58.79
Oneida	2985	68.07
Lewis	2935	76.43
Butte	1980	76.74
Camas	765	72.86
Clark	390	42.62