Idaho Population By County in 2018
Updated on June 22, 2021.
According to the US Census Bureau population estimates, there were 1,750,536 people living in Idaho in 2018. Ada County was the most populated county with 468,764 residents, followed by Canyon County with 223,236 residents, and Kootenai County with 161,209 residents. Clark County with a population of 851 was the least populated county in Idaho in 2018.
Use the map below to interactively explore the population of each county in Idaho in 2018. The data can also be explored further by sorting and filtering with the table below.
Hover/Click on the counties to see the values.
Idaho Population By County (2018)
Table of Idaho Population By County in 2018
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| County | Population | % of State Population |
|---|---|---|
| Ada | 468,764 | 26.78% |
| Adams | 4,234 | 0.24% |
| Bannock | 86,674 | 4.95% |
| Bear Lake | 6,044 | 0.35% |
| Benewah | 9,218 | 0.53% |
| Bingham | 46,129 | 2.64% |
| Blaine | 22,771 | 1.30% |
| Boise | 7,655 | 0.44% |
| Bonner | 44,705 | 2.55% |
| Bonneville | 116,444 | 6.65% |
| Boundary | 12,016 | 0.69% |
| Butte | 2,587 | 0.15% |
| Camas | 1,121 | 0.06% |
| Canyon | 223,236 | 12.75% |
| Caribou | 7,037 | 0.40% |
| Cassia | 23,791 | 1.36% |
| Clark | 851 | 0.05% |
| Clearwater | 8,758 | 0.50% |
| Custer | 4,250 | 0.24% |
| Elmore | 27,362 | 1.56% |
| Franklin | 13,704 | 0.78% |
| Fremont | 13,155 | 0.75% |
| Gem | 17,587 | 1.00% |
| Gooding | 15,116 | 0.86% |
| Idaho | 16,476 | 0.94% |
| Jefferson | 29,405 | 1.68% |
| Jerome | 24,066 | 1.38% |
| Kootenai | 161,209 | 9.21% |
| Latah | 39,829 | 2.28% |
| Lemhi | 7,932 | 0.45% |
| Lewis | 3,832 | 0.22% |
| Lincoln | 5,398 | 0.31% |
| Madison | 39,261 | 2.24% |
| Minidoka | 20,719 | 1.18% |
| Nez Perce | 40,256 | 2.30% |
| Oneida | 4,462 | 0.26% |
| Owyhee | 11,669 | 0.67% |
| Payette | 23,507 | 1.34% |
| Power | 7,700 | 0.44% |
| Shoshone | 12,790 | 0.73% |
| Teton | 11,651 | 0.67% |
| Twin Falls | 86,029 | 4.91% |
| Valley | 11,021 | 0.63% |
| Washington | 10,115 | 0.58% |
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