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 2023, at 95.3%. Caroline County had the lowest, at 84%. The median was 91.8% and the figure for Maryland was 91%. Source: the U.S. Census Bureau.

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Highest95.3Howard County
Lowest84Caroline County
Median91.824 counties
Maryland91History

Map of counties, 2023

Allegany County: 89.7 %Anne Arundel County: 93.8 %Baltimore County: 91.7 %Calvert County: 94.9 %Caroline County: 84 %Carroll County: 94.9 %Cecil County: 91.5 %Charles County: 94.3 %Dorchester County: 86.8 %Frederick County: 93.4 %Garrett County: 89.9 %Harford County: 94.6 %Howard County: 95.3 %Kent County: 91.8 %Montgomery County: 91.3 %Prince George's County: 86.7 %Queen Anne's County: 93.6 %St. Mary's County: 92.4 %Somerset County: 85 %Talbot County: 92 %Washington County: 88.7 %Wicomico County: 89.4 %Worcester County: 93.7 %Baltimore city: 87.2 %
  • Under 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

Howard County: 95.3 %Howard County95.3Calvert County: 94.9 %Calvert County94.9Carroll County: 94.9 %Carroll County94.9Harford County: 94.6 %Harford County94.6Charles County: 94.3 %Charles County94.3Anne Arundel County: 93.8 %Anne Arundel County93.8Worcester County: 93.7 %Worcester County93.7Queen Anne's County: 93.6 %Queen Anne's County93.6Frederick County: 93.4 %Frederick County93.4St. Mary's County: 92.4 %St. Mary's County92.4Talbot County: 92 %Talbot County92Kent County: 91.8 %Kent County91.8Baltimore County: 91.7 %Baltimore County91.7Cecil County: 91.5 %Cecil County91.5Montgomery County: 91.3 %Montgomery County91.3Garrett County: 89.9 %Garrett County89.9Allegany County: 89.7 %Allegany County89.7Wicomico County: 89.4 %Wicomico County89.4Washington County: 88.7 %Washington County88.7Baltimore city: 87.2 %Baltimore city87.2Dorchester County: 86.8 %Dorchester County86.8Prince George's County: 86.7 %Prince George's County86.7Somerset County: 85 %Somerset County85Caroline County: 84 %Caroline County84Howard County: 95.3 %Howard County95.3Calvert County: 94.9 %Calvert County94.9Carroll County: 94.9 %Carroll County94.9Harford County: 94.6 %Harford County94.6Charles County: 94.3 %Charles County94.3Anne Arundel County: 93.8 %Anne Arundel County93.8Worcester County: 93.7 %Worcester County93.7Queen Anne's County: 93.6 %Queen Anne's County93.6Frederick County: 93.4 %Frederick County93.4St. Mary's County: 92.4 %St. Mary's County92.4Talbot County: 92 %Talbot County92Kent County: 91.8 %Kent County91.8Baltimore County: 91.7 %Baltimore County91.7Cecil County: 91.5 %Cecil County91.5Montgomery County: 91.3 %Montgomery County91.3Garrett County: 89.9 %Garrett County89.9Allegany County: 89.7 %Allegany County89.7Wicomico County: 89.4 %Wicomico County89.4Washington County: 88.7 %Washington County88.7Baltimore city: 87.2 %Baltimore city87.2Dorchester County: 86.8 %Dorchester County86.8Prince George's County: 86.7 %Prince George's County86.7Somerset County: 85 %Somerset County85Caroline County: 84 %Caroline County84
%. Source: Invokely calculation with data from U.S. Census Bureau. Retrieved 2026-10-12.

Full ranking

RankCounties2023 (%)Change on 2022
1Howard County95.30 pts
2Calvert County94.9+0.4 pts
3Carroll County94.9+0.7 pts
4Harford County94.6+0.5 pts
5Charles County94.3-0.1 pts
6Anne Arundel County93.8+0.2 pts
7Worcester County93.7+0.2 pts
8Queen Anne's County93.6+0.3 pts
9Frederick County93.4+0.2 pts
10St. Mary's County92.4+0.6 pts
11Talbot County92-0.2 pts
12Kent County91.8+1.3 pts
13Baltimore County91.7-0 pts
14Cecil County91.5+0.1 pts
15Montgomery County91.3-0 pts
16Garrett County89.9-0.7 pts
17Allegany County89.7-0.8 pts
18Wicomico County89.4+0.9 pts
19Washington County88.7+0.3 pts
20Baltimore city87.2+0.1 pts
21Dorchester County86.8-0.9 pts
22Prince George's County86.7-0.4 pts
23Somerset County85+0.3 pts
24Caroline County84-0.4 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 Maryland 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 Maryland 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/maryland-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 Maryland 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/maryland-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 Maryland 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/maryland-counties?period=2023 (Accessed: 12 October 2026).

BibTeX
@misc{census_counties_in_maryland_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 Maryland 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/maryland-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 Maryland 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/maryland-counties?period=2023
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/high-school-graduate-or-higher/maryland-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 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 95.3% in 2023, according to the U.S. Census Bureau.

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

Caroline County, with 84% 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 Maryland: more rankings