Idaho Population By County in 2015

Updated on June 16, 2025.

Based on the US Census Vintage data estimates, in 2015, the population of Idaho was 1,652,495. Among all Idaho counties, Ada had the highest population (433,254), followed by Canyon (206,956), and Kootenai (149,566).

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 2015

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County	Population	% of State Population
Ada	433254	26.22
Adams	3891	0.24
Bannock	84263	5.10
Bear Lake	5883	0.36
Benewah	8999	0.55
Bingham	45071	2.73
Blaine	21659	1.31
Boise	6963	0.42
Bonner	41656	2.52
Bonneville	109916	6.65
Boundary	11310	0.68
Butte	2565	0.16
Camas	1068	0.07
Canyon	206956	12.52
Caribou	6732	0.41
Cassia	23497	1.42
Clark	885	0.05
Clearwater	8554	0.52
Custer	4061	0.25
Elmore	25861	1.57
Franklin	12974	0.79
Fremont	12824	0.78
Gem	16706	1.01
Gooding	15181	0.92
Idaho	16312	0.99
Jefferson	27133	1.64
Jerome	22960	1.39
Kootenai	149566	9.05
Latah	38860	2.35
Lemhi	7744	0.47
Lewis	3792	0.23
Lincoln	5312	0.32
Madison	38120	2.31
Minidoka	20431	1.24
Nez Perce	40039	2.42
Oneida	4249	0.26
Owyhee	11294	0.68
Payette	22833	1.38
Power	7690	0.47
Shoshone	12446	0.75
Teton	10744	0.65
Twin Falls	82289	4.98
Valley	10058	0.61
Washington	9894	0.60