Idaho Citizen Population By County in 2021 (ACS-5Yrs)

Updated on March 28, 2026.

Based on the US Census Bureau's special tabulation from the ACS 5-year estimates, in 2021, the citizen population for Idaho was 1,752,605 and represented 96.74% of the total Idaho population.

Among all Idaho counties, Ada had the highest citizen population (472.17K), followed by Canyon (216.59K), and Kootenai (166.79K).

In terms of percentages, Valley had the highest percentage of its population being citizens (99.70%), followed by Benewah (99.69%), and Nez Perce (99.64%).

The chart and table below shows the citizen population of each county and the percentage of each county's population that were citizens.

You can see similar information for other states and by state for the United States.

You may also be interested in:
Idaho Citizen Voting-age Population By County in 2021

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

See this for other years:

Idaho Citizen Population By County in 2021

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County	Citizen Population	% of County Population
Ada	472165	97.30
Canyon	216590	95.26
Kootenai	166790	99.09
Bonneville	118925	97.66
Bannock	84945	98.36
Twin Falls	84510	94.82
Madison	49780	97.65
Bingham	46340	97.48
Bonner	45995	98.96
Nez Perce	41670	99.64
Latah	38440	97.40
Jefferson	29645	97.44
Elmore	26905	94.75
Payette	23795	95.45
Cassia	22730	92.89
Blaine	21365	89.51
Jerome	20380	84.64
Minidoka	19490	91.10
Gem	18295	97.89
Idaho	16415	99.52
Gooding	14040	91.05
Franklin	13855	98.72
Shoshone	13030	99.28
Fremont	12775	95.55
Boundary	11600	96.95
Valley	11440	99.70
Owyhee	10995	93.06
Teton	10765	93.69
Washington	10010	96.02
Benewah	9480	99.69
Clearwater	8560	98.17
Lemhi	7880	99.12
Boise	7390	97.88
Power	7175	91.34
Caribou	6825	97.43
Bear Lake	6225	98.42
Lincoln	4635	89.39
Oneida	4435	98.23
Adams	4280	99.07
Custer	4250	99.42
Lewis	3595	99.45
Butte	2495	96.89
Camas	1025	98.09
Clark	685	81.55