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

Madison County had the highest high school graduate or higher, population 25 and over of 44 counties in 2023, at 97%. Jerome County had the lowest, at 73.4%. The median was 90.7% and the figure for Idaho was 91.7%. Source: the U.S. Census Bureau.

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Highest97Madison County
Lowest73.4Jerome County
Median90.744 counties
Idaho91.7History

Map of counties, 2023

Ada County: 95.1 %Adams County: 92.9 %Bannock County: 93.8 %Bear Lake County: 93 %Benewah County: 84.4 %Bingham County: 89.2 %Blaine County: 91.2 %Boise County: 95.6 %Bonner County: 91.6 %Bonneville County: 92.1 %Boundary County: 87.2 %Butte County: 87.6 %Camas County: 86 %Canyon County: 87.7 %Caribou County: 90.6 %Cassia County: 85.4 %Clark County: 75.7 %Clearwater County: 91.1 %Custer County: 93.6 %Elmore County: 88.1 %Franklin County: 94 %Fremont County: 90.7 %Gem County: 89 %Gooding County: 79.8 %Idaho County: 91.8 %Jefferson County: 93.3 %Jerome County: 73.4 %Kootenai County: 94.4 %Latah County: 96.9 %Lemhi County: 92.7 %Lewis County: 90.8 %Lincoln County: 82.5 %Madison County: 97 %Minidoka County: 82.1 %Nez Perce County: 92.9 %Oneida County: 94.2 %Owyhee County: 77.7 %Payette County: 86.7 %Power County: 88 %Shoshone County: 88.8 %Teton County: 92.6 %Twin Falls County: 88.7 %Valley County: 91 %Washington County: 88.7 %
  • Under 85
  • 85 to 88
  • 88 to 91
  • 91 to 92
  • 92 to 94
  • 94 and over
%, 2023. Source: Invokely calculation with data from U.S. Census Bureau. Boundaries: U.S. Census Bureau cartographic boundary files.

All counties, 2023

Madison County: 97 %Madison County97Latah County: 96.9 %Latah County96.9Boise County: 95.6 %Boise County95.6Ada County: 95.1 %Ada County95.1Kootenai County: 94.4 %Kootenai County94.4Oneida County: 94.2 %Oneida County94.2Franklin County: 94 %Franklin County94Bannock County: 93.8 %Bannock County93.8Custer County: 93.6 %Custer County93.6Jefferson County: 93.3 %Jefferson County93.3Bear Lake County: 93 %Bear Lake County93Nez Perce County: 92.9 %Nez Perce County92.9Adams County: 92.9 %Adams County92.9Lemhi County: 92.7 %Lemhi County92.7Teton County: 92.6 %Teton County92.6Bonneville County: 92.1 %Bonneville County92.1Idaho County: 91.8 %Idaho County91.8Bonner County: 91.6 %Bonner County91.6Blaine County: 91.2 %Blaine County91.2Clearwater County: 91.1 %Clearwater County91.1Valley County: 91 %Valley County91Lewis County: 90.8 %Lewis County90.8Fremont County: 90.7 %Fremont County90.7Caribou County: 90.6 %Caribou County90.6Bingham County: 89.2 %Bingham County89.2Gem County: 89 %Gem County89Shoshone County: 88.8 %Shoshone County88.8Washington County: 88.7 %Washington County88.7Twin Falls County: 88.7 %Twin Falls County88.7Elmore County: 88.1 %Elmore County88.1Power County: 88 %Power County88Canyon County: 87.7 %Canyon County87.7Butte County: 87.6 %Butte County87.6Boundary County: 87.2 %Boundary County87.2Payette County: 86.7 %Payette County86.7Camas County: 86 %Camas County86Cassia County: 85.4 %Cassia County85.4Benewah County: 84.4 %Benewah County84.4Lincoln County: 82.5 %Lincoln County82.5Minidoka County: 82.1 %Minidoka County82.1Gooding County: 79.8 %Gooding County79.8Owyhee County: 77.7 %Owyhee County77.7Clark County: 75.7 %Clark County75.7Jerome County: 73.4 %Jerome County73.4Madison County: 97 %Madison County97Latah County: 96.9 %Latah County96.9Boise County: 95.6 %Boise County95.6Ada County: 95.1 %Ada County95.1Kootenai County: 94.4 %Kootenai County94.4Oneida County: 94.2 %Oneida County94.2Franklin County: 94 %Franklin County94Bannock County: 93.8 %Bannock County93.8Custer County: 93.6 %Custer County93.6Jefferson County: 93.3 %Jefferson County93.3Bear Lake County: 93 %Bear Lake County93Nez Perce County: 92.9 %Nez Perce County92.9Adams County: 92.9 %Adams County92.9Lemhi County: 92.7 %Lemhi County92.7Teton County: 92.6 %Teton County92.6Bonneville County: 92.1 %Bonneville County92.1Idaho County: 91.8 %Idaho County91.8Bonner County: 91.6 %Bonner County91.6Blaine County: 91.2 %Blaine County91.2Clearwater County: 91.1 %Clearwater County91.1Valley County: 91 %Valley County91Lewis County: 90.8 %Lewis County90.8Fremont County: 90.7 %Fremont County90.7Caribou County: 90.6 %Caribou County90.6Bingham County: 89.2 %Bingham County89.2Gem County: 89 %Gem County89Shoshone County: 88.8 %Shoshone County88.8Washington County: 88.7 %Washington County88.7Twin Falls County: 88.7 %Twin Falls County88.7Elmore County: 88.1 %Elmore County88.1Power County: 88 %Power County88Canyon County: 87.7 %Canyon County87.7Butte County: 87.6 %Butte County87.6Boundary County: 87.2 %Boundary County87.2Payette County: 86.7 %Payette County86.7Camas County: 86 %Camas County86Cassia County: 85.4 %Cassia County85.4Benewah County: 84.4 %Benewah County84.4Lincoln County: 82.5 %Lincoln County82.5Minidoka County: 82.1 %Minidoka County82.1Gooding County: 79.8 %Gooding County79.8Owyhee County: 77.7 %Owyhee County77.7Clark County: 75.7 %Clark County75.7Jerome County: 73.4 %Jerome County73.4
%. Source: Invokely calculation with data from U.S. Census Bureau. Retrieved 2026-10-12.

Full ranking

RankCounties2023 (%)Change on 2022
1Madison County97-0.4 pts
2Latah County96.90 pts
3Boise County95.6+0.1 pts
4Ada County95.1-0.2 pts
5Kootenai County94.4+0.8 pts
6Oneida County94.2+0.8 pts
7Franklin County94+1.9 pts
8Bannock County93.8+0.4 pts
9Custer County93.6+2.3 pts
10Jefferson County93.3+0.7 pts
11Bear Lake County93-0.1 pts
12Nez Perce County92.9-0 pts
13Adams County92.9-1.1 pts
14Lemhi County92.7+1 pts
15Teton County92.6-0.8 pts
16Bonneville County92.1+0.1 pts
17Idaho County91.8-0.4 pts
18Bonner County91.6+0.3 pts
19Blaine County91.2-0.6 pts
20Clearwater County91.1-0.6 pts
21Valley County91-1.8 pts
22Lewis County90.8+0.9 pts
23Fremont County90.7+0.8 pts
24Caribou County90.6+0.1 pts
25Bingham County89.2+0.8 pts
26Gem County89-1.1 pts
27Shoshone County88.8+0.7 pts
28Washington County88.7-1.5 pts
29Twin Falls County88.7+1.3 pts
30Elmore County88.1+0.1 pts
31Power County88+3.7 pts
32Canyon County87.7+0.7 pts
33Butte County87.6-2.8 pts
34Boundary County87.2+0.4 pts
35Payette County86.7+0.8 pts
36Camas County86-1.2 pts
37Cassia County85.4-0.3 pts
38Benewah County84.4-0.7 pts
39Lincoln County82.5+1 pts
40Minidoka County82.1+0.7 pts
41Gooding County79.8+0.8 pts
42Owyhee County77.7+1.7 pts
43Clark County75.7+14.1 pts
44Jerome County73.4-1.9 pts

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/2023/table-based-SF/data/5YRData/acsdt5y2023-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, 2023) [Data set]. Retrieved October 12, 2026, from https://www2.census.gov/programs-surveys/acs/summary_file/2023/table-based-SF/data/5YRData/acsdt5y2023-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, 2023. U.S. Census Bureau, 29 Jan. 2026, https://www2.census.gov/programs-surveys/acs/summary_file/2023/table-based-SF/data/5YRData/acsdt5y2023-b15003.dat. Invokely, https://invokely.ai/rankings/high-school-graduate-or-higher/idaho-counties?period=2023. 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, 2023. Dataset. Accessed October 12, 2026. https://www2.census.gov/programs-surveys/acs/summary_file/2023/table-based-SF/data/5YRData/acsdt5y2023-b15003.dat. Also distributed by Invokely, https://invokely.ai/rankings/high-school-graduate-or-higher/idaho-counties?period=2023.

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, 2023 [Dataset]. Available at: https://www2.census.gov/programs-surveys/acs/summary_file/2023/table-based-SF/data/5YRData/acsdt5y2023-b15003.dat, via Invokely: https://invokely.ai/rankings/high-school-graduate-or-higher/idaho-counties?period=2023 (Accessed: 12 October 2026).

BibTeX
@misc{census_counties_in_idaho_by_2023,
  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, 2023}},
  year = {2026},
  howpublished = {Data set},
  url = {https://www2.census.gov/programs-surveys/acs/summary_file/2023/table-based-SF/data/5YRData/acsdt5y2023-b15003.dat},
  urldate = {2026-10-12},
  note = {Accessed via Invokely, https://invokely.ai/rankings/high-school-graduate-or-higher/idaho-counties?period=2023. 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/2023/table-based-SF/data/5YRData/acsdt5y2023-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, 2023
PY  - 2026
DA  - 2026/01/29
PB  - U.S. Census Bureau
DB  - Invokely
UR  - https://www2.census.gov/programs-surveys/acs/summary_file/2023/table-based-SF/data/5YRData/acsdt5y2023-b15003.dat
L2  - https://invokely.ai/rankings/high-school-graduate-or-higher/idaho-counties?period=2023
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/high-school-graduate-or-higher/idaho-counties?period=2023.
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/2023/table-based-SF/data/5YRData/acsdt5y2023-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.
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Questions

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

Madison County, with 97% in 2023, according to the U.S. Census Bureau.

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

Jerome County, with 73.4% in 2023.

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