Idaho 2020 Census Total Voting-age Population (18yrs and over) By County

According to the data from the US 2020 decennial Census, as at April 2020, the total Voting-age population (18 years and over) of Idaho was 1,376,400, which was 74.84% of the total Idaho population.

Ada County had the highest voting-age population (378,479), followed by Canyon County (166,440), and then Kootenai County (132,205). On the other hand, the 3 counties with low voting-age population were: Clark County (580), Camas County (829), and Butte County (1,922).

You can also see this information for other states and also for the US by state.

Hover over or click on the counties to see the number and percentage of Idaho population that lives in each county. 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 also see the voting-age population by county for the different racial groups as well as the different ethnicities in Idaho.