Ranking of Pennsylvania 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 Pennsylvania (aged 25 years and above) who had an educational attainment of Less than High School Diploma was 8.64%. Among all Pennsylvania counties, Juniata County had the highest percentage of its population (aged 25 years and above) with an educational attainment of Less than High School Diploma (16.98%), followed by Forest County (16.59%), and Mifflin County (14.68%).
The chart below shows the top 10 Pennsylvania counties, and the table below shows the ranking of all Pennsylvania 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: Pennsylvania ACS-5Yrs Estimates, 2021 Topic List.
Data Source: US Census - ACS 5-Year Estimates.
Ranking of Pennsylvania 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 | Juniata County | 16.98 |
| 2 | Forest County | 16.59 |
| 3 | Mifflin County | 14.68 |
| 4 | Lancaster County | 13.65 |
| 5 | Snyder County | 13.51 |
| 6 | Philadelphia County | 13.45 |
| 7 | Berks County | 12.45 |
| 8 | Lebanon County | 12.44 |
| 9 | Greene County | 11.95 |
| 10 | Union County | 11.78 |
| 11 | Clearfield County | 11.39 |
| 12 | Fulton County | 11.38 |
| 13 | Perry County | 11.14 |
| 14 | Fayette County | 10.97 |
| 15 | Franklin County | 10.71 |
| 16 | Schuylkill County | 10.60 |
| 17 | Bedford County | 10.54 |
| 17 | Potter County | 10.54 |
| 18 | Somerset County | 10.53 |
| 19 | Northumberland County | 10.38 |
| 20 | Monroe County | 10.35 |
| 21 | Lehigh County | 10.31 |
| 22 | Adams County | 10.24 |
| 23 | Huntingdon County | 10.07 |
| 24 | Clinton County | 9.94 |
| 25 | Mercer County | 9.87 |
| 26 | Bradford County | 9.78 |
| 26 | Luzerne County | 9.78 |
| 27 | Crawford County | 9.74 |
| 28 | Carbon County | 9.70 |
| 29 | Sullivan County | 9.63 |
| 30 | Clarion County | 9.57 |
| 31 | Jefferson County | 9.53 |
| 32 | Susquehanna County | 9.48 |
| 33 | Wayne County | 9.47 |
| 34 | Lycoming County | 9.38 |
| 35 | York County | 9.23 |
| 36 | Dauphin County | 9.09 |
| 37 | Tioga County | 9.00 |
| 38 | Columbia County | 8.90 |
| 39 | Lackawanna County | 8.44 |
| 40 | Venango County | 8.40 |
| 41 | Northampton County | 8.36 |
| 42 | Montour County | 8.35 |
| 43 | Erie County | 8.34 |
| 44 | Indiana County | 8.27 |
| 45 | Lawrence County | 8.24 |
| 46 | Blair County | 7.62 |
| 47 | Armstrong County | 7.61 |
| 48 | Cameron County | 7.58 |
| 49 | Cambria County | 7.52 |
| 50 | McKean County | 7.35 |
| 51 | Wyoming County | 7.07 |
| 52 | Elk County | 7.02 |
| 53 | Pike County | 6.91 |
| 54 | Warren County | 6.88 |
| 55 | Cumberland County | 6.74 |
| 56 | Delaware County | 6.56 |
| 57 | Washington County | 6.14 |
| 58 | Centre County | 5.64 |
| 59 | Bucks County | 5.51 |
| 60 | Chester County | 5.49 |
| 61 | Beaver County | 5.45 |
| 62 | Montgomery County | 5.34 |
| 63 | Westmoreland County | 5.11 |
| 64 | Allegheny County | 4.91 |
| 65 | Butler County | 4.50 |