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Top counties

Top regions sorted by number of observed species
Rank Region Species Checklists Species
1 Bucks
353
97,476
2 Lancaster
352
95,075
3 Erie
349
46,636
4 Delaware
346
64,077
5 Philadelphia
343
82,251
6 Berks
334
57,781
7 Centre
330
121,979
8 Chester
324
144,970
9 Montgomery
324
164,296
10 Dauphin
319
42,555
11 Northampton
317
39,577
12 Cumberland
315
56,214
13 Allegheny
301
169,284
14 Lebanon
301
38,251
15 Westmoreland
300
36,672
16 Huntingdon
298
36,888
17 Luzerne
298
46,081
18 Franklin
297
25,951
19 Lehigh
295
43,349
20 York
295
52,603
21 Crawford
293
29,180
22 Indiana
293
29,831
23 Lycoming
288
36,714
24 Butler
287
48,174
25 Somerset
285
13,938
26 Mercer
283
19,652
27 Clinton
279
14,265
28 Carbon
278
11,824
29 Schuylkill
274
23,241
30 Monroe
273
33,444
31 Northumberland
270
7262
32 Tioga
269
31,463
33 Bedford
268
9105
34 Montour
267
7115
35 Clarion
265
10,774
36 Juniata
264
9433
37 Adams
263
18,066
38 Beaver
262
10,472
39 Lawrence
261
16,890
40 Perry
260
9318
41 Cambria
259
10,924
42 Fayette
259
12,087
43 Washington
257
19,844
44 Clearfield
256
8741
45 McKean
255
9826
46 Mifflin
255
7331
47 Armstrong
254
17,035
48 Blair
252
14,214
49 Pike
252
13,880
50 Susquehanna
249
19,779
51 Venango
248
3576
52 Snyder
247
4712
53 Union
247
5285
54 Warren
246
5649
55 Wayne
239
9574
56 Lackawanna
235
16,617
57 Elk
234
6313
58 Wyoming
231
5220
59 Columbia
230
5466
60 Jefferson
229
3499
61 Bradford
228
6258
62 Potter
228
5119
63 Fulton
226
4353
64 Forest
222
6027
65 Cameron
220
3488
66 Sullivan
220
3611
67 Greene
214
3510