Top counties
Updated ~15 hr(s) ago.
| Rank | Region | Species | Checklists | Species |
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| 1 | Los Angeles |
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| 2 | San Diego |
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| 3 | Santa Barbara |
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| 4 | San Francisco |
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| 5 | Orange |
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| 6 | Marin |
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| 7 | Monterey |
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| 8 | Ventura |
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| 9 | Humboldt |
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| 10 | Riverside |
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| 11 | San Bernardino |
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| 12 | San Luis Obispo |
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| 13 | San Mateo |
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| 14 | Santa Cruz |
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| 15 | Sonoma |
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| 16 | Kern |
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| 17 | Inyo |
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| 18 | Imperial |
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| 19 | Del Norte |
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| 20 | Mendocino |
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| 21 | Alameda |
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| 22 | Santa Clara |
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| 23 | Contra Costa |
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| 24 | Mono |
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| 25 | Yolo |
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| 26 | San Joaquin |
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| 27 | Solano |
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| 28 | Tulare |
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| 29 | Sacramento |
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| 30 | Fresno |
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| 31 | Siskiyou |
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| 32 | Butte |
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| 33 | Lassen |
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| 34 | Plumas |
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| 35 | Modoc |
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| 36 | Shasta |
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| 37 | Stanislaus |
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| 38 | Placer |
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| 39 | El Dorado |
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| 40 | Napa |
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| 41 | Lake |
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| 42 | San Benito |
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| 43 | Kings |
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| 44 | Merced |
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| 45 | Madera |
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| 46 | Tehama |
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| 47 | Glenn |
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| 48 | Colusa |
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| 49 | Sierra |
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| 50 | Mariposa |
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| 51 | Yuba |
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| 52 | Nevada |
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| 53 | Sutter |
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| 54 | Alpine |
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| 55 | Amador |
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| 56 | Trinity |
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| 57 | Calaveras |
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| 58 | Tuolumne |
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