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

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

Jefferson County had the highest high school graduate or higher, population 25 and over of 39 counties in 2021, at 96.1%. Adams County had the lowest, at 68.5%. The median was 92.1% and the figure for Washington was 91.9%. Source: the U.S. Census Bureau.

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Highest96.1Jefferson County
Lowest68.5Adams County
Median92.139 counties
Washington91.9History

Map of counties, 2021

Adams County: 68.5 %Asotin County: 91.5 %Benton County: 90.3 %Chelan County: 84.7 %Clallam County: 92.9 %Clark County: 93 %Columbia County: 91 %Cowlitz County: 89.9 %Douglas County: 82.1 %Ferry County: 90.2 %Franklin County: 75.9 %Garfield County: 94 %Grant County: 80.3 %Grays Harbor County: 90.1 %Island County: 95.5 %Jefferson County: 96.1 %King County: 93.7 %Kitsap County: 95.2 %Kittitas County: 92.4 %Klickitat County: 90.6 %Lewis County: 89.3 %Lincoln County: 92.3 %Mason County: 90.4 %Okanogan County: 85 %Pacific County: 90.3 %Pend Oreille County: 92.8 %Pierce County: 92.1 %San Juan County: 95.7 %Skagit County: 91.1 %Skamania County: 92.8 %Snohomish County: 92.9 %Spokane County: 94.2 %Stevens County: 92.4 %Thurston County: 94.2 %Wahkiakum County: 92.8 %Walla Walla County: 88.4 %Whatcom County: 93.2 %Whitman County: 95.4 %Yakima County: 73.8 %
  • Under 86
  • 86 to 90
  • 90 to 92
  • 92 to 93
  • 93 to 94
  • 94 and over
%, 2021. Source: Invokely calculation with data from U.S. Census Bureau. Boundaries: U.S. Census Bureau cartographic boundary files.

All counties, 2021

Jefferson County: 96.1 %Jefferson County96.1San Juan County: 95.7 %San Juan County95.7Island County: 95.5 %Island County95.5Whitman County: 95.4 %Whitman County95.4Kitsap County: 95.2 %Kitsap County95.2Thurston County: 94.2 %Thurston County94.2Spokane County: 94.2 %Spokane County94.2Garfield County: 94 %Garfield County94King County: 93.7 %King County93.7Whatcom County: 93.2 %Whatcom County93.2Clark County: 93 %Clark County93Clallam County: 92.9 %Clallam County92.9Snohomish County: 92.9 %Snohomish County92.9Skamania County: 92.8 %Skamania County92.8Pend Oreille County: 92.8 %Pend Oreille County92.8Wahkiakum County: 92.8 %Wahkiakum County92.8Kittitas County: 92.4 %Kittitas County92.4Stevens County: 92.4 %Stevens County92.4Lincoln County: 92.3 %Lincoln County92.3Pierce County: 92.1 %Pierce County92.1Asotin County: 91.5 %Asotin County91.5Skagit County: 91.1 %Skagit County91.1Columbia County: 91 %Columbia County91Klickitat County: 90.6 %Klickitat County90.6Mason County: 90.4 %Mason County90.4Pacific County: 90.3 %Pacific County90.3Benton County: 90.3 %Benton County90.3Ferry County: 90.2 %Ferry County90.2Grays Harbor County: 90.1 %Grays Harbor County90.1Cowlitz County: 89.9 %Cowlitz County89.9Lewis County: 89.3 %Lewis County89.3Walla Walla County: 88.4 %Walla Walla County88.4Okanogan County: 85 %Okanogan County85Chelan County: 84.7 %Chelan County84.7Douglas County: 82.1 %Douglas County82.1Grant County: 80.3 %Grant County80.3Franklin County: 75.9 %Franklin County75.9Yakima County: 73.8 %Yakima County73.8Adams County: 68.5 %Adams County68.5Jefferson County: 96.1 %Jefferson County96.1San Juan County: 95.7 %San Juan County95.7Island County: 95.5 %Island County95.5Whitman County: 95.4 %Whitman County95.4Kitsap County: 95.2 %Kitsap County95.2Thurston County: 94.2 %Thurston County94.2Spokane County: 94.2 %Spokane County94.2Garfield County: 94 %Garfield County94King County: 93.7 %King County93.7Whatcom County: 93.2 %Whatcom County93.2Clark County: 93 %Clark County93Clallam County: 92.9 %Clallam County92.9Snohomish County: 92.9 %Snohomish County92.9Skamania County: 92.8 %Skamania County92.8Pend Oreille County: 92.8 %Pend Oreille County92.8Wahkiakum County: 92.8 %Wahkiakum County92.8Kittitas County: 92.4 %Kittitas County92.4Stevens County: 92.4 %Stevens County92.4Lincoln County: 92.3 %Lincoln County92.3Pierce County: 92.1 %Pierce County92.1Asotin County: 91.5 %Asotin County91.5Skagit County: 91.1 %Skagit County91.1Columbia County: 91 %Columbia County91Klickitat County: 90.6 %Klickitat County90.6Mason County: 90.4 %Mason County90.4Pacific County: 90.3 %Pacific County90.3Benton County: 90.3 %Benton County90.3Ferry County: 90.2 %Ferry County90.2Grays Harbor County: 90.1 %Grays Harbor County90.1Cowlitz County: 89.9 %Cowlitz County89.9Lewis County: 89.3 %Lewis County89.3Walla Walla County: 88.4 %Walla Walla County88.4Okanogan County: 85 %Okanogan County85Chelan County: 84.7 %Chelan County84.7Douglas County: 82.1 %Douglas County82.1Grant County: 80.3 %Grant County80.3Franklin County: 75.9 %Franklin County75.9Yakima County: 73.8 %Yakima County73.8Adams County: 68.5 %Adams County68.5
%. Source: Invokely calculation with data from U.S. Census Bureau. Retrieved 2026-10-12.

Full ranking

RankCounties2021 (%)
1Jefferson County96.1
2San Juan County95.7
3Island County95.5
4Whitman County95.4
5Kitsap County95.2
6Thurston County94.2
7Spokane County94.2
8Garfield County94
9King County93.7
10Whatcom County93.2
11Clark County93
12Clallam County92.9
13Snohomish County92.9
14Skamania County92.8
15Pend Oreille County92.8
16Wahkiakum County92.8
17Kittitas County92.4
18Stevens County92.4
19Lincoln County92.3
20Pierce County92.1
21Asotin County91.5
22Skagit County91.1
23Columbia County91
24Klickitat County90.6
25Mason County90.4
26Pacific County90.3
27Benton County90.3
28Ferry County90.2
29Grays Harbor County90.1
30Cowlitz County89.9
31Lewis County89.3
32Walla Walla County88.4
33Okanogan County85
34Chelan County84.7
35Douglas County82.1
36Grant County80.3
37Franklin County75.9
38Yakima County73.8
39Adams County68.5

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 Washington 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 Washington 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/washington-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 Washington 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/washington-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 Washington 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/washington-counties?period=2021 (Accessed: 12 October 2026).

BibTeX
@misc{census_counties_in_washington_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 Washington 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/washington-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 Washington 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/washington-counties?period=2021
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/high-school-graduate-or-higher/washington-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 Washington 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?

Jefferson County, with 96.1% in 2021, according to the U.S. Census Bureau.

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

Adams County, with 68.5% 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 Washington: more rankings