Data / Rankings / High school graduate or higher, population 25 and over / Counties in Idaho

Counties in Idaho by high school graduate or higher, population 25 and over

Latah County had the highest high school graduate or higher, population 25 and over of 44 counties in 2021, at 96.5%. Clark County had the lowest, at 65.4%. The median was 89.5% and the figure for Idaho was 91.2%. Source: the U.S. Census Bureau.

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Highest96.5Latah County
Lowest65.4Clark County
Median89.544 counties
Idaho91.2History

Map of counties, 2021

Ada County: 95 %Adams County: 92.5 %Bannock County: 93.3 %Bear Lake County: 93.1 %Benewah County: 85.8 %Bingham County: 89.3 %Blaine County: 90 %Boise County: 94.7 %Bonner County: 91.9 %Bonneville County: 92.5 %Boundary County: 88.3 %Butte County: 89.2 %Camas County: 79.5 %Canyon County: 86.5 %Caribou County: 89.7 %Cassia County: 84.3 %Clark County: 65.4 %Clearwater County: 92.4 %Custer County: 87 %Elmore County: 89.3 %Franklin County: 92.8 %Fremont County: 88.5 %Gem County: 87.8 %Gooding County: 77.2 %Idaho County: 92.2 %Jefferson County: 91.8 %Jerome County: 76.3 %Kootenai County: 93.5 %Latah County: 96.5 %Lemhi County: 90 %Lewis County: 90 %Lincoln County: 81.3 %Madison County: 95.6 %Minidoka County: 79.1 %Nez Perce County: 93.2 %Oneida County: 90.1 %Owyhee County: 74.9 %Payette County: 86.1 %Power County: 79.5 %Shoshone County: 88.4 %Teton County: 92.4 %Twin Falls County: 87 %Valley County: 90.6 %Washington County: 87.8 %
  • Under 82
  • 82 to 88
  • 88 to 90
  • 90 to 92
  • 92 to 93
  • 93 and over
%, 2021. Source: Invokely calculation with data from U.S. Census Bureau. Boundaries: U.S. Census Bureau cartographic boundary files.

All counties, 2021

Latah County: 96.5 %Latah County96.5Madison County: 95.6 %Madison County95.6Ada County: 95 %Ada County95Boise County: 94.7 %Boise County94.7Kootenai County: 93.5 %Kootenai County93.5Bannock County: 93.3 %Bannock County93.3Nez Perce County: 93.2 %Nez Perce County93.2Bear Lake County: 93.1 %Bear Lake County93.1Franklin County: 92.8 %Franklin County92.8Adams County: 92.5 %Adams County92.5Bonneville County: 92.5 %Bonneville County92.5Clearwater County: 92.4 %Clearwater County92.4Teton County: 92.4 %Teton County92.4Idaho County: 92.2 %Idaho County92.2Bonner County: 91.9 %Bonner County91.9Jefferson County: 91.8 %Jefferson County91.8Valley County: 90.6 %Valley County90.6Oneida County: 90.1 %Oneida County90.1Blaine County: 90 %Blaine County90Lewis County: 90 %Lewis County90Lemhi County: 90 %Lemhi County90Caribou County: 89.7 %Caribou County89.7Bingham County: 89.3 %Bingham County89.3Elmore County: 89.3 %Elmore County89.3Butte County: 89.2 %Butte County89.2Fremont County: 88.5 %Fremont County88.5Shoshone County: 88.4 %Shoshone County88.4Boundary County: 88.3 %Boundary County88.3Washington County: 87.8 %Washington County87.8Gem County: 87.8 %Gem County87.8Twin Falls County: 87 %Twin Falls County87Custer County: 87 %Custer County87Canyon County: 86.5 %Canyon County86.5Payette County: 86.1 %Payette County86.1Benewah County: 85.8 %Benewah County85.8Cassia County: 84.3 %Cassia County84.3Lincoln County: 81.3 %Lincoln County81.3Camas County: 79.5 %Camas County79.5Power County: 79.5 %Power County79.5Minidoka County: 79.1 %Minidoka County79.1Gooding County: 77.2 %Gooding County77.2Jerome County: 76.3 %Jerome County76.3Owyhee County: 74.9 %Owyhee County74.9Clark County: 65.4 %Clark County65.4Latah County: 96.5 %Latah County96.5Madison County: 95.6 %Madison County95.6Ada County: 95 %Ada County95Boise County: 94.7 %Boise County94.7Kootenai County: 93.5 %Kootenai County93.5Bannock County: 93.3 %Bannock County93.3Nez Perce County: 93.2 %Nez Perce County93.2Bear Lake County: 93.1 %Bear Lake County93.1Franklin County: 92.8 %Franklin County92.8Adams County: 92.5 %Adams County92.5Bonneville County: 92.5 %Bonneville County92.5Clearwater County: 92.4 %Clearwater County92.4Teton County: 92.4 %Teton County92.4Idaho County: 92.2 %Idaho County92.2Bonner County: 91.9 %Bonner County91.9Jefferson County: 91.8 %Jefferson County91.8Valley County: 90.6 %Valley County90.6Oneida County: 90.1 %Oneida County90.1Blaine County: 90 %Blaine County90Lewis County: 90 %Lewis County90Lemhi County: 90 %Lemhi County90Caribou County: 89.7 %Caribou County89.7Bingham County: 89.3 %Bingham County89.3Elmore County: 89.3 %Elmore County89.3Butte County: 89.2 %Butte County89.2Fremont County: 88.5 %Fremont County88.5Shoshone County: 88.4 %Shoshone County88.4Boundary County: 88.3 %Boundary County88.3Washington County: 87.8 %Washington County87.8Gem County: 87.8 %Gem County87.8Twin Falls County: 87 %Twin Falls County87Custer County: 87 %Custer County87Canyon County: 86.5 %Canyon County86.5Payette County: 86.1 %Payette County86.1Benewah County: 85.8 %Benewah County85.8Cassia County: 84.3 %Cassia County84.3Lincoln County: 81.3 %Lincoln County81.3Camas County: 79.5 %Camas County79.5Power County: 79.5 %Power County79.5Minidoka County: 79.1 %Minidoka County79.1Gooding County: 77.2 %Gooding County77.2Jerome County: 76.3 %Jerome County76.3Owyhee County: 74.9 %Owyhee County74.9Clark County: 65.4 %Clark County65.4
%. Source: Invokely calculation with data from U.S. Census Bureau. Retrieved 2026-10-12.

Full ranking

RankCounties2021 (%)
1Latah County96.5
2Madison County95.6
3Ada County95
4Boise County94.7
5Kootenai County93.5
6Bannock County93.3
7Nez Perce County93.2
8Bear Lake County93.1
9Franklin County92.8
10Adams County92.5
10Bonneville County92.5
12Clearwater County92.4
13Teton County92.4
14Idaho County92.2
15Bonner County91.9
16Jefferson County91.8
17Valley County90.6
18Oneida County90.1
19Blaine County90
20Lewis County90
21Lemhi County90
22Caribou County89.7
23Bingham County89.3
24Elmore County89.3
25Butte County89.2
26Fremont County88.5
27Shoshone County88.4
28Boundary County88.3
29Washington County87.8
30Gem County87.8
31Twin Falls County87
32Custer County87
33Canyon County86.5
34Payette County86.1
35Benewah County85.8
36Cassia County84.3
37Lincoln County81.3
38Camas County79.5
39Power County79.5
40Minidoka County79.1
41Gooding County77.2
42Jerome County76.3
43Owyhee County74.9
44Clark County65.4

Other periods

About this ranking

People aged 25 and over who hold a regular high school diploma, a GED or alternative credential, or any higher level of education, as a percentage of all people aged 25 and over. United States: American Community Survey five-year estimate, where the period shown is the last year of the five-year span.

Measures the adult population, not students: it is not the high school graduation rate of a class. Not comparable with the EU share below upper secondary education, which covers ages 25 to 64.

Every value in the ranking comes from the same publisher and the same period, so the counties are compared on one definition. Equal values share a rank.

How to cite

U.S. Census Bureau. American Community Survey 5-year estimates, table B15003: population 25 years and over with a high school diploma, GED or higher as a percentage of the population 25 years and over, calculated with stored inputs. https://www2.census.gov/programs-surveys/acs/summary_file/2021/table-based-SF/data/5YRData/acsdt5y2021-b15003.dat. Retrieved 2026-10-12.

Citation styles

The publisher is the author. Invokely is named only as the place the figures were read, where a style asks for it.

APA 7

U.S. Census Bureau. (2026). American Community Survey 5-year estimates, table B15003: population 25 years and over with a high school diploma, GED or higher as a percentage of the population 25 years and over, calculated with stored inputs (Counties in Idaho by high school graduate or higher, population 25 and over, 2021) [Data set]. Retrieved October 12, 2026, from https://www2.census.gov/programs-surveys/acs/summary_file/2021/table-based-SF/data/5YRData/acsdt5y2021-b15003.dat

MLA 9

American Community Survey 5-year estimates, table B15003: population 25 years and over with a high school diploma, GED or higher as a percentage of the population 25 years and over, calculated with stored inputs, Counties in Idaho by high school graduate or higher, population 25 and over, 2021. U.S. Census Bureau, 29 Jan. 2026, https://www2.census.gov/programs-surveys/acs/summary_file/2021/table-based-SF/data/5YRData/acsdt5y2021-b15003.dat. Invokely, https://invokely.ai/rankings/high-school-graduate-or-higher/idaho-counties?period=2021. Accessed 12 Oct. 2026.

Chicago (author-date)

U.S. Census Bureau. 2026. American Community Survey 5-year estimates, table B15003: population 25 years and over with a high school diploma, GED or higher as a percentage of the population 25 years and over, calculated with stored inputs. Counties in Idaho by high school graduate or higher, population 25 and over, 2021. Dataset. Accessed October 12, 2026. https://www2.census.gov/programs-surveys/acs/summary_file/2021/table-based-SF/data/5YRData/acsdt5y2021-b15003.dat. Also distributed by Invokely, https://invokely.ai/rankings/high-school-graduate-or-higher/idaho-counties?period=2021.

Harvard

U.S. Census Bureau (2026) American Community Survey 5-year estimates, table B15003: population 25 years and over with a high school diploma, GED or higher as a percentage of the population 25 years and over, calculated with stored inputs, Counties in Idaho by high school graduate or higher, population 25 and over, 2021 [Dataset]. Available at: https://www2.census.gov/programs-surveys/acs/summary_file/2021/table-based-SF/data/5YRData/acsdt5y2021-b15003.dat, via Invokely: https://invokely.ai/rankings/high-school-graduate-or-higher/idaho-counties?period=2021 (Accessed: 12 October 2026).

BibTeX
@misc{census_counties_in_idaho_by_2021,
  author = {{U.S. Census Bureau}},
  title = {{American Community Survey 5-year estimates, table B15003: population 25 years and over with a high school diploma, GED or higher as a percentage of the population 25 years and over, calculated with stored inputs: Counties in Idaho by high school graduate or higher, population 25 and over, 2021}},
  year = {2026},
  howpublished = {Data set},
  url = {https://www2.census.gov/programs-surveys/acs/summary_file/2021/table-based-SF/data/5YRData/acsdt5y2021-b15003.dat},
  urldate = {2026-10-12},
  note = {Accessed via Invokely, https://invokely.ai/rankings/high-school-graduate-or-higher/idaho-counties?period=2021. Publisher attribution: U.S. Census Bureau. American Community Survey 5-year estimates, table B15003: population 25 years and over with a high school diploma, GED or higher as a percentage of the population 25 years and over, calculated with stored inputs. https://www2.census.gov/programs-surveys/acs/summary\_file/2021/table-based-SF/data/5YRData/acsdt5y2021-b15003.dat. Retrieved 2026-10-12.},
}
RIS
TY  - DATA
AU  - U.S. Census Bureau
TI  - American Community Survey 5-year estimates, table B15003: population 25 years and over with a high school diploma, GED or higher as a percentage of the population 25 years and over, calculated with stored inputs: Counties in Idaho by high school graduate or higher, population 25 and over, 2021
PY  - 2026
DA  - 2026/01/29
PB  - U.S. Census Bureau
DB  - Invokely
UR  - https://www2.census.gov/programs-surveys/acs/summary_file/2021/table-based-SF/data/5YRData/acsdt5y2021-b15003.dat
L2  - https://invokely.ai/rankings/high-school-graduate-or-higher/idaho-counties?period=2021
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/high-school-graduate-or-higher/idaho-counties?period=2021.
N1  - Publisher attribution: U.S. Census Bureau. American Community Survey 5-year estimates, table B15003: population 25 years and over with a high school diploma, GED or higher as a percentage of the population 25 years and over, calculated with stored inputs. https://www2.census.gov/programs-surveys/acs/summary_file/2021/table-based-SF/data/5YRData/acsdt5y2021-b15003.dat. Retrieved 2026-10-12.
ER  -
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Rank Counties in Idaho by high school graduate or higher, population 25 and over using official data, and cite the source.
rank_places {"indicator":"high_school_graduate_share","level":"province","within":"Idaho","limit":10}
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Questions

Which county has the highest high school graduate or higher, population 25 and over?

Latah County, with 96.5% in 2021, according to the U.S. Census Bureau.

Which county has the lowest high school graduate or higher, population 25 and over?

Clark County, with 65.4% in 2021.

Where does this ranking come from?

Every value comes from one source and one period, so the places are comparable: U.S. Census Bureau, American Community Survey 5-year estimates, table B15003: population 25 years and over with a high school diploma, GED or higher as a percentage of the population 25 years and over, calculated with stored inputs. Retrieved 2026-10-12.

High school graduate or higher, population 25 and over: other rankings

Counties in Idaho: more rankings