Ranking of Idaho Counties By Total Voting-age Population (18yrs and over) from Census 2020
Updated on August 22, 2023.
According to the data from the US 2020 Census, as at April 2020, among all the counties in Idaho, Ada County had the highest voting-age population (18 years and over) (378.48K), followed by Canyon County (166.44K), and Kootenai County (132.21K).
The chart below shows the top 10 counties with high voting-age population, and the table below shows the ranking of all Idaho counties based on voting-age population.
You can also see the ranking of counties by population for other states as well as for the whole United States.
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Related Topics: Idaho Census 2020 Topic List.
Data Source: US Census Bureau, 2020 Census.
Ranking of Idaho Counties By Total Voting-age Population from Census 2020
Rank | County | Voting-age Population |
|---|---|---|
| 1 | Ada County | 378,479 |
| 2 | Canyon County | 166,440 |
| 3 | Kootenai County | 132,205 |
| 4 | Bonneville County | 86,205 |
| 5 | Twin Falls County | 65,472 |
| 6 | Bannock County | 64,357 |
| 7 | Madison County | 42,141 |
| 8 | Bonner County | 37,908 |
| 9 | Bingham County | 33,315 |
| 10 | Nez Perce County | 33,042 |
| 11 | Latah County | 31,752 |
| 12 | Elmore County | 21,446 |
| 13 | Jefferson County | 20,372 |
| 14 | Blaine County | 19,152 |
| 15 | Payette County | 18,652 |
| 16 | Cassia County | 16,999 |
| 17 | Jerome County | 16,874 |
| 18 | Minidoka County | 15,383 |
| 19 | Gem County | 14,596 |
| 20 | Idaho County | 13,270 |
| 21 | Gooding County | 11,275 |
| 22 | Shoshone County | 10,589 |
| 23 | Fremont County | 9,698 |
| 24 | Franklin County | 9,682 |
| 25 | Valley County | 9,560 |
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