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Top counties

Top regions sorted by number of observed species
Rank Region Species Checklists Species
1 Los Angeles
547
454,791
2 San Diego
547
389,639
3 Santa Barbara
512
118,874
4 San Francisco
509
149,672
5 Marin
508
160,023
6 Orange
504
232,437
7 Monterey
501
172,835
8 Ventura
494
113,309
9 Humboldt
487
124,370
10 Riverside
486
118,991
11 San Bernardino
474
97,280
12 San Luis Obispo
473
119,331
13 San Mateo
470
188,027
14 Santa Cruz
454
180,131
15 Sonoma
453
118,099
16 Kern
444
82,891
17 Inyo
432
58,479
18 Del Norte
428
20,167
19 Imperial
427
46,616
20 Mendocino
423
69,134
21 Alameda
407
152,579
22 Santa Clara
401
181,907
23 Contra Costa
381
117,780
24 Mono
379
47,552
25 Yolo
371
78,191
26 San Joaquin
359
35,403
27 Solano
357
32,028
28 Siskiyou
348
31,412
29 Sacramento
345
132,189
30 Tulare
343
34,359
31 Fresno
339
34,897
32 Butte
335
35,942
33 Lassen
330
11,291
34 Plumas
326
30,659
35 Shasta
325
31,741
36 Stanislaus
324
33,327
37 Modoc
323
9192
38 Placer
322
38,468
39 Napa
320
22,543
40 Lake
318
15,996
41 El Dorado
317
25,077
42 San Benito
314
30,627
43 Kings
310
7521
44 Merced
306
17,872
45 Madera
304
13,891
46 Tehama
296
16,130
47 Glenn
295
11,466
48 Yuba
289
9209
49 Colusa
288
13,920
50 Sierra
286
14,873
51 Mariposa
285
30,131
52 Nevada
282
30,169
53 Alpine
280
8636
54 Sutter
279
8899
55 Amador
276
10,132
56 Trinity
275
5277
57 Tuolumne
273
22,928
58 Calaveras
270
9626