Ranking of Pennsylvania Counties By Population Aged 25 years and above with an Educational attainment of High School Graduate or Equivalent 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 High School Graduate or Equivalent was 3,079,339. Among all Pennsylvania counties, Philadelphia County had the highest population (aged 25 years and above) with an educational attainment of High School Graduate or Equivalent (343,452), followed by Allegheny County (234,448), and Montgomery County (136,362).
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 High School Graduate or Equivalent in 2021
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| Rank | County | Number of People |
|---|---|---|
| 1 | Philadelphia County | 343452 |
| 2 | Allegheny County | 234448 |
| 3 | Montgomery County | 136362 |
| 4 | Bucks County | 128121 |
| 5 | Lancaster County | 127880 |
| 6 | York County | 123317 |
| 7 | Delaware County | 109181 |
| 8 | Berks County | 106288 |
| 9 | Westmoreland County | 94051 |
| 10 | Luzerne County | 88518 |
| 11 | Lehigh County | 81618 |
| 12 | Northampton County | 73343 |
| 13 | Chester County | 72108 |
| 14 | Erie County | 69820 |
| 15 | Dauphin County | 64805 |
| 16 | Cumberland County | 57062 |
| 17 | Lackawanna County | 55017 |
| 18 | Washington County | 54941 |
| 19 | Schuylkill County | 47377 |
| 20 | Franklin County | 46862 |
| 21 | Fayette County | 45513 |
| 22 | Beaver County | 45305 |
| 23 | Butler County | 43065 |
| 24 | Cambria County | 42381 |
| 25 | Lebanon County | 41794 |
| 26 | Monroe County | 40417 |
| 27 | Blair County | 39331 |
| 28 | Northumberland County | 33069 |
| 29 | Mercer County | 32995 |
| 30 | Lycoming County | 30958 |
| 31 | Adams County | 29157 |
| 32 | Clearfield County | 28481 |
| 33 | Crawford County | 27920 |
| 34 | Centre County | 27689 |
| 35 | Somerset County | 27226 |
| 36 | Lawrence County | 27035 |
| 37 | Armstrong County | 23866 |
| 38 | Indiana County | 22760 |
| 39 | Carbon County | 21490 |
| 40 | Bradford County | 20203 |
| 41 | Columbia County | 19234 |
| 42 | Venango County | 17667 |
| 43 | Wayne County | 17422 |
| 44 | Bedford County | 17339 |
| 45 | Jefferson County | 16212 |
| 46 | Huntingdon County | 16083 |
| 47 | Mifflin County | 16075 |
| 48 | Perry County | 15289 |
| 49 | Pike County | 14903 |
| 50 | McKean County | 13613 |
| 51 | Susquehanna County | 13365 |
| 52 | Warren County | 13193 |
| 53 | Tioga County | 12950 |
| 54 | Union County | 12399 |
| 55 | Clarion County | 12183 |
| 56 | Clinton County | 11797 |
| 57 | Snyder County | 11630 |
| 58 | Greene County | 11590 |
| 59 | Elk County | 11270 |
| 60 | Wyoming County | 8805 |
| 61 | Juniata County | 8115 |
| 62 | Potter County | 5552 |
| 63 | Fulton County | 5196 |
| 64 | Montour County | 4744 |
| 65 | Forest County | 3257 |
| 66 | Sullivan County | 2384 |
| 67 | Cameron County | 1846 |