NOTE: Gray indicates insufficient data or a suppressed estimate.
The Philadelphia suburban collar counties—particularly Chester, Montgomery, and Bucks—display consistently high bachelor's attainment rates exceeding 50%, forming the state's most prominent cluster of highly educated zip codes, with a secondary concentration visible around Pittsburgh's eastern suburbs in Allegheny County. Central Pennsylvania's rural zip codes, spanning the ridge-and-valley region from Blair to Schuylkill counties, exhibit notably lower attainment rates predominantly in the 10–20% range, punctuated by isolated pockets of higher education near college towns such as State College and Lewisburg. The contrast between the southeast corner and the northern tier is stark, with much of the state's rural north showing attainment rates below 20% while the Philadelphia metro area sustains rates two to three times higher.
Data: U.S. Census Bureau, 2023 ACS
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