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Top counties

Top regions sorted by number of observed species
Rank Region Species Checklists Species
1 Polk
356
32,000
2 Johnson
340
31,875
3 Story
324
15,821
4 Woodbury
320
4499
5 Marion
319
3044
6 Pottawattamie
310
5528
7 Cerro Gordo
307
1763
8 Dickinson
307
2486
9 Linn
307
18,753
10 Black Hawk
303
10,781
11 Fremont
303
1172
12 Scott
301
8740
13 Des Moines
295
2061
14 Dubuque
295
7878
15 Boone
292
2656
16 Warren
290
1008
17 Appanoose
285
930
18 Jackson
285
2381
19 Dallas
284
5185
20 Louisa
284
2521
21 Kossuth
280
670
22 Tama
277
1588
23 Clay
275
961
24 Hardin
273
1192
25 Lee
273
1509
26 Bremer
272
2848
27 Greene
272
2098
28 Jasper
272
3209
29 Muscatine
270
2484
30 Harrison
269
2529
31 Iowa
268
1296
32 Sioux
267
1705
33 Madison
265
2406
34 Buena Vista
264
1260
35 Guthrie
264
752
36 Marshall
264
1835
37 Allamakee
262
2522
38 Decatur
262
661
39 Carroll
260
1510
40 Monona
257
694
41 Sac
256
827
42 Clinton
255
1157
43 Lucas
255
2477
44 Poweshiek
253
1120
45 Winnebago
253
1433
46 Hancock
250
490
47 Winneshiek
250
2412
48 Clayton
249
1400
49 Butler
248
1113
50 Hamilton
248
759
51 Jefferson
246
5041
52 Van Buren
245
1718
53 Palo Alto
243
459
54 Benton
242
1266
55 Union
242
417
56 Emmet
240
334
57 Webster
240
649
58 Pocahontas
239
687
59 Plymouth
238
474
60 Buchanan
235
1992
61 Mills
235
639
62 Washington
234
1363
63 Cherokee
229
284
64 Grundy
227
459
65 Jones
227
627
66 Wright
227
223
67 Fayette
226
632
68 Montgomery
226
275
69 Mitchell
225
226
70 Calhoun
224
517
71 Cedar
221
844
72 Mahaska
221
504
73 Wayne
218
188
74 Franklin
215
308
75 Wapello
213
476
76 Floyd
209
375
77 Lyon
209
439
78 Henry
208
607
79 O'Brien
208
342
80 Ringgold
208
603
81 Shelby
208
261
82 Howard
207
359
83 Taylor
207
179
84 Audubon
205
139
85 Page
205
170
86 Adams
202
156
87 Monroe
202
257
88 Keokuk
201
274
89 Worth
201
437
90 Cass
199
890
91 Clarke
198
249
92 Delaware
198
567
93 Humboldt
196
113
94 Adair
194
363
95 Davis
194
217
96 Ida
189
284
97 Chickasaw
187
339
98 Osceola
181
128
99 Crawford
175
166