Top counties
Updated ~15 hr(s) ago.
| Rank | Region | Species | Checklists | Species |
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| 1 | Bucks |
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| 2 | Lancaster |
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| 3 | Erie |
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| 4 | Delaware |
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| 5 | Philadelphia |
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| 6 | Berks |
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| 7 | Centre |
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| 8 | Chester |
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| 9 | Montgomery |
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| 10 | Dauphin |
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| 11 | Cumberland |
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| 12 | Northampton |
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| 13 | Lebanon |
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| 14 | Allegheny |
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| 15 | Westmoreland |
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| 16 | Huntingdon |
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| 17 | Luzerne |
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| 18 | Lehigh |
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| 19 | Franklin |
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| 20 | Indiana |
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| 21 | York |
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| 22 | Crawford |
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| 23 | Lycoming |
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| 24 | Somerset |
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| 25 | Butler |
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| 26 | Mercer |
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| 27 | Clinton |
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| 28 | Carbon |
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| 29 | Monroe |
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| 30 | Northumberland |
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| 31 | Tioga |
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| 32 | Bedford |
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| 33 | Schuylkill |
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| 34 | Montour |
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| 35 | Juniata |
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| 36 | Beaver |
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| 37 | Adams |
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| 38 | Clarion |
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| 39 | Perry |
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| 40 | Cambria |
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| 41 | Lawrence |
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| 42 | Fayette |
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| 43 | Washington |
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| 44 | Armstrong |
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| 45 | Clearfield |
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| 46 | McKean |
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| 47 | Blair |
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| 48 | Mifflin |
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| 49 | Susquehanna |
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| 50 | Venango |
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| 51 | Pike |
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| 52 | Warren |
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| 53 | Union |
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| 54 | Snyder |
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| 55 | Wayne |
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| 56 | Lackawanna |
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| 57 | Elk |
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| 58 | Wyoming |
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| 59 | Columbia |
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| 60 | Bradford |
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| 61 | Jefferson |
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| 62 | Fulton |
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| 63 | Cameron |
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| 64 | Potter |
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| 65 | Forest |
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| 66 | Sullivan |
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| 67 | Greene |
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