Idaho Population By County in 2021

Updated on June 16, 2025.

Based on the US Census Vintage data estimates, in 2021, the population of Idaho was 1,904,848. Among all Idaho counties, Ada had the highest population (513,098), followed by Canyon (243,752), and Kootenai (180,089).

Hover over or click on the counties in the map below to see the populations. The data can also be found in a table below. You can use the table to sort, filter, and explore the data further.

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

Related Topics: Idaho Census Vintage Data Topic List.

Data Source: US Census Bureau (Vintage).

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Idaho Population By County in 2021

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County	Population	% of State Population
Ada	513098	26.94
Adams	4621	0.24
Bannock	88523	4.65
Bear Lake	6569	0.35
Benewah	9900	0.52
Bingham	48938	2.57
Blaine	24784	1.30
Boise	8133	0.43
Bonner	49649	2.61
Bonneville	128072	6.72
Boundary	12627	0.66
Butte	2665	0.14
Camas	1137	0.06
Canyon	243752	12.80
Caribou	7115	0.37
Cassia	25242	1.33
Clark	794	0.04
Clearwater	8927	0.47
Custer	4444	0.23
Elmore	28994	1.52
Franklin	14673	0.77
Fremont	13593	0.71
Gem	19813	1.04
Gooding	15806	0.83
Idaho	17059	0.90
Jefferson	32208	1.69
Jerome	24740	1.30
Kootenai	180089	9.45
Latah	40406	2.12
Lemhi	8158	0.43
Lewis	3689	0.19
Lincoln	5289	0.28
Madison	54079	2.84
Minidoka	21951	1.15
Nez Perce	42511	2.23
Oneida	4604	0.24
Owyhee	12362	0.65
Payette	26385	1.39
Power	7980	0.42
Shoshone	13623	0.72
Teton	12273	0.64
Twin Falls	92410	4.85
Valley	12258	0.64
Washington	10905	0.57