Idaho Citizen Voting-age Population By County in 2020 (ACS-5Yrs)

Updated on March 28, 2026.

Based on the US Census Bureau's special tabulation from the ACS 5-year estimates, in 2020, the citizen voting-age population for Idaho was 1,255,410 and represented 71.56% of the total Idaho population.

Among all Idaho counties, Ada had the highest citizen voting-age population (347.91K), followed by Canyon (150.91K), and Kootenai (123.30K).

In terms of percentages, Valley had the highest percentage of its population being citizens of voting-age (82.91%), followed by Adams (82.86%), and Boise (82.36%).

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 2020

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

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Idaho Citizen Voting-age Population By County in 2020

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County	Citizen Voting-age Population	% of County Population
Ada	347905	74.11
Canyon	150905	67.40
Kootenai	123300	76.26
Bonneville	77945	66.64
Bannock	62390	71.93
Twin Falls	58140	67.45
Bonner	35415	79.25
Nez Perce	31680	78.28
Latah	31500	78.65
Bingham	30700	66.39
Madison	27935	70.32
Elmore	18950	70.07
Jefferson	18735	64.07
Payette	16520	69.69
Blaine	15875	69.84
Cassia	14840	62.24
Jerome	13540	56.24
Idaho	13255	80.29
Gem	13155	74.03
Minidoka	12905	62.00
Shoshone	10055	79.17
Gooding	9635	63.06
Valley	9190	82.91
Franklin	9145	66.58
Fremont	9145	69.76
Boundary	9125	75.07
Teton	8240	69.98
Owyhee	7875	67.16
Washington	7340	72.46
Benewah	7110	77.03
Clearwater	7065	80.88
Lemhi	6415	80.90
Boise	6280	82.36
Caribou	4795	68.21
Power	4650	60.90
Bear Lake	4415	72.92
Adams	3480	82.86
Custer	3415	81.41
Lincoln	3140	58.80
Oneida	3030	68.40
Lewis	2960	76.88
Butte	2040	78.31
Camas	810	75.70
Clark	460	51.98