Idaho Population By County in 2018
Updated on January 29, 2024.
According to the US Census Bureau population estimates, there were 1,752,074 people living in Idaho in 2018. Ada County was the most populated county with 469,161 residents, followed by Canyon County with 223,518 residents, and Kootenai County with 161,279 residents. Clark County with a population of 845 was the least populated county in Idaho in 2018.
Use the map below to interactively explore the population for each county in Idaho in 2018. The data can also be explored further by sorting and filtering with the table below.
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).
See this for other years:
Idaho Population By County (2018)
Table of Idaho Population By County in 2018
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| County | Population | % of State Population |
|---|---|---|
| Ada | 469,161 | 26.78% |
| Adams | 4,215 | 0.24% |
| Bannock | 86,761 | 4.95% |
| Bear Lake | 6,026 | 0.34% |
| Benewah | 9,222 | 0.53% |
| Bingham | 46,054 | 2.63% |
| Blaine | 22,736 | 1.30% |
| Boise | 7,689 | 0.44% |
| Bonner | 44,709 | 2.55% |
| Bonneville | 116,661 | 6.66% |
| Boundary | 12,073 | 0.69% |
| Butte | 2,592 | 0.15% |
| Camas | 1,098 | 0.06% |
| Canyon | 223,518 | 12.76% |
| Caribou | 7,019 | 0.40% |
| Cassia | 23,769 | 1.36% |
| Clark | 845 | 0.05% |
| Clearwater | 8,759 | 0.50% |
| Custer | 4,216 | 0.24% |
| Elmore | 27,309 | 1.56% |
| Franklin | 13,718 | 0.78% |
| Fremont | 13,162 | 0.75% |
| Gem | 17,622 | 1.01% |
| Gooding | 15,187 | 0.87% |
| Idaho | 16,469 | 0.94% |
| Jefferson | 29,418 | 1.68% |
| Jerome | 24,078 | 1.37% |
| Kootenai | 161,279 | 9.21% |
| Latah | 39,996 | 2.28% |
| Lemhi | 7,974 | 0.46% |
| Lewis | 3,835 | 0.22% |
| Lincoln | 5,360 | 0.31% |
| Madison | 39,451 | 2.25% |
| Minidoka | 20,667 | 1.18% |
| Nez Perce | 40,408 | 2.31% |
| Oneida | 4,429 | 0.25% |
| Owyhee | 11,664 | 0.67% |
| Payette | 23,560 | 1.35% |
| Power | 7,654 | 0.44% |
| Shoshone | 12,781 | 0.73% |
| Teton | 11,640 | 0.66% |
| Twin Falls | 86,166 | 4.92% |
| Valley | 11,054 | 0.63% |
| Washington | 10,070 | 0.57% |