Ranking of New Hampshire 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 New Hampshire (aged 25 years and above) who had an educational attainment of Less than High School Diploma was 6.37%. Among all New Hampshire counties, Coos County had the highest percentage of its population (aged 25 years and above) with an educational attainment of Less than High School Diploma (10.83%), followed by Sullivan County (9.31%), and Hillsborough County (7.09%).
The chart below shows the top 10 New Hampshire counties, and the table below shows the ranking of all New Hampshire counties.
You can see similar information for other educational attainments.
You can also see similar information for other states and for the United States.
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Related Topics: New Hampshire ACS-5Yrs Estimates, 2021 Topic List.
Data Source: US Census - ACS 5-Year Estimates.
Ranking of New Hampshire 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 | Coos County | 10.83 |
| 2 | Sullivan County | 9.31 |
| 3 | Hillsborough County | 7.09 |
| 4 | Grafton County | 7.01 |
| 5 | Merrimack County | 6.80 |
| 6 | Belknap County | 6.45 |
| 7 | Cheshire County | 6.31 |
| 8 | Strafford County | 6.17 |
| 9 | Carroll County | 4.91 |
| 10 | Rockingham County | 4.48 |