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

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

Howard County had the highest high school graduate or higher, population 25 and over of 24 counties in 2021, at 95.4%. Somerset County had the lowest, at 83.2%. The median was 91.4% and the figure for Maryland was 90.8%. Source: the U.S. Census Bureau.

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Highest95.4Howard County
Lowest83.2Somerset County
Median91.424 counties
Maryland90.8History

Map of counties, 2021

Allegany County: 90.3 %Anne Arundel County: 93.4 %Baltimore County: 91.6 %Calvert County: 94.5 %Caroline County: 84.9 %Carroll County: 93.8 %Cecil County: 90.8 %Charles County: 93.7 %Dorchester County: 87.4 %Frederick County: 92.9 %Garrett County: 90.4 %Harford County: 93.7 %Howard County: 95.4 %Kent County: 90.6 %Montgomery County: 91.2 %Prince George's County: 87.2 %Queen Anne's County: 92.9 %St. Mary's County: 91.7 %Somerset County: 83.2 %Talbot County: 91.7 %Washington County: 88.1 %Wicomico County: 87.8 %Worcester County: 92.8 %Baltimore city: 86.3 %
  • Under 88
  • 88 to 91
  • 91 to 92
  • 92 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

Howard County: 95.4 %Howard County95.4Calvert County: 94.5 %Calvert County94.5Carroll County: 93.8 %Carroll County93.8Harford County: 93.7 %Harford County93.7Charles County: 93.7 %Charles County93.7Anne Arundel County: 93.4 %Anne Arundel County93.4Frederick County: 92.9 %Frederick County92.9Queen Anne's County: 92.9 %Queen Anne's County92.9Worcester County: 92.8 %Worcester County92.8St. Mary's County: 91.7 %St. Mary's County91.7Talbot County: 91.7 %Talbot County91.7Baltimore County: 91.6 %Baltimore County91.6Montgomery County: 91.2 %Montgomery County91.2Cecil County: 90.8 %Cecil County90.8Kent County: 90.6 %Kent County90.6Garrett County: 90.4 %Garrett County90.4Allegany County: 90.3 %Allegany County90.3Washington County: 88.1 %Washington County88.1Wicomico County: 87.8 %Wicomico County87.8Dorchester County: 87.4 %Dorchester County87.4Prince George's County: 87.2 %Prince George's County87.2Baltimore city: 86.3 %Baltimore city86.3Caroline County: 84.9 %Caroline County84.9Somerset County: 83.2 %Somerset County83.2Howard County: 95.4 %Howard County95.4Calvert County: 94.5 %Calvert County94.5Carroll County: 93.8 %Carroll County93.8Harford County: 93.7 %Harford County93.7Charles County: 93.7 %Charles County93.7Anne Arundel County: 93.4 %Anne Arundel County93.4Frederick County: 92.9 %Frederick County92.9Queen Anne's County: 92.9 %Queen Anne's County92.9Worcester County: 92.8 %Worcester County92.8St. Mary's County: 91.7 %St. Mary's County91.7Talbot County: 91.7 %Talbot County91.7Baltimore County: 91.6 %Baltimore County91.6Montgomery County: 91.2 %Montgomery County91.2Cecil County: 90.8 %Cecil County90.8Kent County: 90.6 %Kent County90.6Garrett County: 90.4 %Garrett County90.4Allegany County: 90.3 %Allegany County90.3Washington County: 88.1 %Washington County88.1Wicomico County: 87.8 %Wicomico County87.8Dorchester County: 87.4 %Dorchester County87.4Prince George's County: 87.2 %Prince George's County87.2Baltimore city: 86.3 %Baltimore city86.3Caroline County: 84.9 %Caroline County84.9Somerset County: 83.2 %Somerset County83.2
%. Source: Invokely calculation with data from U.S. Census Bureau. Retrieved 2026-10-12.

Full ranking

RankCounties2021 (%)
1Howard County95.4
2Calvert County94.5
3Carroll County93.8
4Harford County93.7
5Charles County93.7
6Anne Arundel County93.4
7Frederick County92.9
8Queen Anne's County92.9
9Worcester County92.8
10St. Mary's County91.7
11Talbot County91.7
12Baltimore County91.6
13Montgomery County91.2
14Cecil County90.8
15Kent County90.6
16Garrett County90.4
17Allegany County90.3
18Washington County88.1
19Wicomico County87.8
20Dorchester County87.4
21Prince George's County87.2
22Baltimore city86.3
23Caroline County84.9
24Somerset County83.2

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 Maryland 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 Maryland 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/maryland-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 Maryland 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/maryland-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 Maryland 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/maryland-counties?period=2021 (Accessed: 12 October 2026).

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

Howard County, with 95.4% in 2021, according to the U.S. Census Bureau.

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

Somerset County, with 83.2% 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 Maryland: more rankings