Ranking of Maryland Counties By Percentage of Population Aged 25 years and above with an Educational attainment of Less than High School Diploma in 2021 (ACS-5Yrs)

Updated on September 3, 2025.

Based on the US Census ACS-5Yrs estimates, in 2021, the percentage of the population of Maryland (aged 25 years and above) who had an educational attainment of Less than High School Diploma was 9.23%. Among all Maryland counties, Somerset County had the highest percentage of its population (aged 25 years and above) with an educational attainment of Less than High School Diploma (16.78%), followed by Caroline County (15.13%), and Baltimore city (13.67%).

The chart below shows the top 10 Maryland counties, and the table below shows the ranking of all Maryland counties.

You can see similar information for other educational attainments.

You can also see similar information for other states and for the United States.

Ranking of Maryland Counties By Percentage of Population (Aged 25yrs+) with an Educational Attainment of Less than High School Diploma in 2021
Somerset County
Caroline County
Baltimore city
Prince George's County
Dorchester County
Wicomico County
Washington County
Allegany County
Garrett County
Kent County
Ranking of Maryland Counties By Percentage of Population (Aged 25yrs+) with an Educational Attainment of Less than High School Diploma in 2021
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Rank County Percentage of Population (Aged 25yrs+) (%)
1 Somerset County 16.78
2 Caroline County 15.13
3 Baltimore city 13.67
4 Prince George's County 12.77
5 Dorchester County 12.58
6 Wicomico County 12.24
7 Washington County 11.92
8 Allegany County 9.74
9 Garrett County 9.58
10 Kent County 9.40
11 Cecil County 9.18
12 Montgomery County 8.77
13 Baltimore County 8.40
14 Talbot County 8.34
15 St. Mary's County 8.33
16 Worcester County 7.21
17 Queen Anne's County 7.13
18 Frederick County 7.06
19 Anne Arundel County 6.60
20 Charles County 6.33
21 Harford County 6.27
22 Carroll County 6.21
23 Calvert County 5.48
24 Howard County 4.63