Pennsylvania Counties By Class
| First Class (1) |
Population of 1,500,000 or more |
| Philadelphia ¨ |
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| Second Class (1) |
Population of 800,000 to 1,499,999 |
| Allegheny ¨ |
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| Second Class A (2-A) (3) |
Population of 500,000 to 799,999 |
| Bucks |
Montgomery |
| Delaware ¨ |
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| Third Class (11) |
Population of 210,000 to 499,999 |
| Berks |
Lancaster |
| Chester |
Lehigh ¨ |
| Dauphin |
Luzerne |
| Northampton ¨ |
Erie ¨ |
| Westmoreland |
Lackawanna ¨ |
| York |
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| Fourth Class (7) |
Population of 145,000 to 209,999 |
| Beaver |
Fayette |
| Butler |
Schuylkill |
| Cambria |
Washington |
| Cumberland |
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| Fifth Class (9) |
Population of 95,000 to 144,999 |
| Blair |
Lycoming |
| Centre |
Mercer |
| Franklin |
Monroe |
| Lawrence |
Northumberland |
| Lebanon |
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| Sixth Class (24) |
Population of 45,000 to 94,999 |
| Adams |
Huntingdon |
| Armstrong |
Indiana |
| Bedford |
Jefferson |
| Bradford |
McKean |
| Carbon |
Mifflin |
| Clarion |
Pike |
| Clearfield |
Somerset |
| Clinton |
Susquehanna |
| Columbia |
Tioga |
| Crawford |
Venango |
| Elk |
Warren |
| Greene |
Wayne |
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| Seventh Class (5) |
Population of 20,000 to 44,999 |
| Juniata |
Union |
| Perry |
Wyoming |
| Snyder |
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| Eighth Class (6) |
Population of less than 20,000 |
| Cameron |
Montour |
| Forest |
Potter |
| Fulton |
Sullivan |
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| ¨ Home Rule Counties (7) |
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