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Top counties

Top regions sorted by number of observed species
Rank Region Species Checklists Species
1 Cook
405
417,478
2 Lake
370
123,228
3 Sangamon
334
14,718
4 Clinton
333
13,125
5 Kane
326
67,382
6 Madison
323
20,331
7 DuPage
322
149,607
8 Will
322
62,559
9 Winnebago
319
19,227
10 Mason
315
7140
11 McLean
314
23,784
12 Fulton
309
7949
13 McHenry
306
46,194
14 Champaign
305
36,137
15 Fayette
303
1624
16 Morgan
303
2373
17 Woodford
302
9586
18 Kankakee
299
26,516
19 La Salle
299
15,881
20 Grundy
298
9017
21 Peoria
296
14,492
22 De Witt
294
4327
23 Coles
293
15,653
24 Macon
293
2914
25 Tazewell
292
16,853
26 Jackson
291
18,390
27 Putnam
291
4785
28 DeKalb
290
8569
29 Monroe
290
2402
30 Williamson
290
15,899
31 Kendall
289
18,465
32 Ogle
289
4044
33 Carroll
288
4793
34 St. Clair
286
28,448
35 Whiteside
286
4076
36 Rock Island
285
10,374
37 Union
284
5329
38 Adams
281
4448
39 Knox
280
3826
40 Lee
279
6492
41 Alexander
278
3209
42 Bureau
277
8410
43 Franklin
275
2381
44 Moultrie
275
1863
45 Marshall
273
2735
46 Massac
273
2840
47 Boone
272
3076
48 Jefferson
272
2535
49 Pike
272
1430
50 Brown
271
829
51 Vermilion
268
4479
52 Shelby
267
1283
53 Calhoun
265
2356
54 Piatt
265
3805
55 Randolph
263
2016
56 Pulaski
262
3134
57 Jasper
261
2017
58 Jersey
261
2236
59 Henry
260
4321
60 Iroquois
259
2757
61 Logan
259
1412
62 Menard
259
25,871
63 Cass
258
1990
64 Clark
258
1989
65 Henderson
258
1073
66 Johnson
258
4189
67 Bond
256
1768
68 Wayne
256
391
69 Stephenson
255
2076
70 Douglas
254
1506
71 Jo Daviess
254
2822
72 Saline
253
5149
73 Christian
252
1424
74 Livingston
252
1664
75 Lawrence
248
721
76 Hancock
246
1255
77 Marion
245
1517
78 Richland
245
654
79 Wabash
245
443
80 Edgar
243
1059
81 Crawford
242
712
82 Mercer
241
1072
83 Perry
240
930
84 Cumberland
239
850
85 Ford
237
930
86 Gallatin
237
703
87 Edwards
235
1002
88 Warren
234
725
89 Montgomery
232
904
90 Effingham
230
1121
91 Stark
230
787
92 McDonough
229
1646
93 Scott
229
400
94 Hardin
228
632
95 Pope
223
1111
96 Washington
223
633
97 Macoupin
221
830
98 Schuyler
220
643
99 White
217
4953
100 Greene
212
461
101 Hamilton
206
512
102 Clay
198
213