Idaho Population By County in 2011

Updated on June 16, 2025.

Based on the US Census Vintage data estimates, in 2011, the population of Idaho was 1,584,272. Among all Idaho counties, Ada had the highest population (401,352), followed by Canyon (191,392), and Kootenai (140,986).

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 2011

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County	Population	% of State Population
Ada	401352	25.33
Adams	3981	0.25
Bannock	83657	5.28
Bear Lake	5961	0.38
Benewah	9176	0.58
Bingham	45903	2.90
Blaine	21085	1.33
Boise	6986	0.44
Bonner	40795	2.58
Bonneville	105833	6.68
Boundary	10822	0.68
Butte	2832	0.18
Camas	1113	0.07
Canyon	191392	12.08
Caribou	6841	0.43
Cassia	23111	1.46
Clark	955	0.06
Clearwater	8609	0.54
Custer	4325	0.27
Elmore	26237	1.66
Franklin	12813	0.81
Fremont	13116	0.83
Gem	16696	1.05
Gooding	15352	0.97
Idaho	16465	1.04
Jefferson	26315	1.66
Jerome	22516	1.42
Kootenai	140986	8.90
Latah	37872	2.39
Lemhi	7985	0.50
Lewis	3805	0.24
Lincoln	5135	0.32
Madison	37937	2.40
Minidoka	20208	1.28
Nez Perce	39444	2.49
Oneida	4232	0.27
Owyhee	11378	0.72
Payette	22561	1.42
Power	7783	0.49
Shoshone	12664	0.80
Teton	10161	0.64
Twin Falls	78108	4.93
Valley	9639	0.61
Washington	10135	0.64