Idaho Citizen Population By County in 2018 (ACS-5Yrs)

Updated on March 28, 2026.

Based on the US Census Bureau's special tabulation from the ACS 5-year estimates, in 2018, the citizen population for Idaho was 1,626,535 and represented 96.37% of the total Idaho population.

Among all Idaho counties, Ada had the highest citizen population (433.16K), followed by Canyon (200.76K), and Kootenai (152.34K).

In terms of percentages, Valley had the highest percentage of its population being citizens (99.90%), followed by Butte (99.81%), and Idaho (99.63%).

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 2018

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

See this for other years:

Idaho Citizen Population By County in 2018

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County	Citizen Population	% of County Population
Ada	433155	97.11
Canyon	200755	94.59
Kootenai	152340	99.18
Bonneville	109130	97.10
Bannock	83000	97.57
Twin Falls	78805	94.19
Bingham	43785	96.13
Bonner	42295	99.03
Nez Perce	39925	99.43
Madison	37685	97.37
Latah	37670	96.00
Jefferson	27165	97.12
Elmore	25130	95.06
Payette	21850	94.84
Cassia	21615	91.53
Jerome	20400	87.07
Blaine	19695	89.54
Minidoka	18545	89.96
Gem	16670	97.77
Idaho	16275	99.63
Gooding	13675	90.15
Franklin	12980	97.74
Fremont	12475	96.22
Shoshone	12410	99.08
Boundary	11260	97.49
Owyhee	10500	91.66
Valley	10390	99.90
Teton	10385	93.73
Washington	9510	94.86
Benewah	9030	99.40
Clearwater	8520	98.61
Lemhi	7680	98.46
Boise	7090	98.95
Power	6980	90.47
Caribou	6760	97.69
Bear Lake	5905	99.08
Lincoln	4650	87.41
Oneida	4245	98.15
Custer	4110	99.28
Adams	4000	99.50
Lewis	3810	99.09
Butte	2595	99.81
Camas	875	98.87
Clark	800	74.42