Ranking of Pennsylvania Counties By 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 population of Pennsylvania (aged 25 years and above) who had an educational attainment of Less than High School Diploma was 787,376. Among all Pennsylvania counties, Philadelphia County had the highest population (aged 25 years and above) with an educational attainment of Less than High School Diploma (147,268), followed by Lancaster County (50,736), and Allegheny County (44,384).
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 Population (Aged 25yrs+) with an Educational Attainment of Less than High School Diploma in 2021
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| Rank | County | Number of People |
|---|---|---|
| 1 | Philadelphia County | 147268 |
| 2 | Lancaster County | 50736 |
| 3 | Allegheny County | 44384 |
| 4 | Berks County | 36218 |
| 5 | Montgomery County | 32006 |
| 6 | York County | 29267 |
| 7 | Lehigh County | 26144 |
| 8 | Delaware County | 25666 |
| 9 | Bucks County | 25470 |
| 10 | Luzerne County | 22658 |
| 11 | Chester County | 19947 |
| 12 | Northampton County | 18288 |
| 13 | Dauphin County | 17911 |
| 14 | Erie County | 15628 |
| 15 | Westmoreland County | 13441 |
| 16 | Lackawanna County | 12847 |
| 17 | Monroe County | 12176 |
| 18 | Cumberland County | 12169 |
| 19 | Lebanon County | 12150 |
| 20 | Franklin County | 11678 |
| 21 | Schuylkill County | 11083 |
| 22 | Fayette County | 10430 |
| 23 | Washington County | 9231 |
| 24 | Mercer County | 7798 |
| 25 | Lycoming County | 7552 |
| 26 | Adams County | 7495 |
| 27 | Cambria County | 7224 |
| 28 | Northumberland County | 6962 |
| 29 | Clearfield County | 6847 |
| 30 | Blair County | 6737 |
| 31 | Beaver County | 6722 |
| 32 | Butler County | 6194 |
| 33 | Somerset County | 5855 |
| 34 | Crawford County | 5757 |
| 35 | Centre County | 5525 |
| 36 | Lawrence County | 5110 |
| 37 | Mifflin County | 4750 |
| 38 | Carbon County | 4641 |
| 39 | Indiana County | 4549 |
| 40 | Bradford County | 4163 |
| 41 | Columbia County | 3890 |
| 42 | Wayne County | 3726 |
| 43 | Armstrong County | 3708 |
| 44 | Bedford County | 3675 |
| 45 | Perry County | 3660 |
| 46 | Snyder County | 3596 |
| 47 | Union County | 3460 |
| 48 | Huntingdon County | 3236 |
| 49 | Venango County | 3158 |
| 50 | Greene County | 3089 |
| 51 | Jefferson County | 3020 |
| 52 | Pike County | 3018 |
| 53 | Juniata County | 2804 |
| 54 | Susquehanna County | 2738 |
| 55 | Tioga County | 2650 |
| 56 | Clinton County | 2467 |
| 57 | Clarion County | 2452 |
| 58 | McKean County | 2124 |
| 59 | Warren County | 1965 |
| 60 | Elk County | 1597 |
| 61 | Wyoming County | 1343 |
| 62 | Potter County | 1261 |
| 63 | Fulton County | 1205 |
| 64 | Montour County | 1105 |
| 65 | Forest County | 1012 |
| 66 | Sullivan County | 471 |
| 67 | Cameron County | 269 |