California County Statistical Summary

The species totals in each county may change often; many of these may not be up-to-date [last revised July 2011 but only new totals submitted were updated; there are cases when old stats still linger without updates despite updates in other totals for the same county]. For most counties, statistics were provided by local experts. See explanation of county statistics for more information.

Counties	Species Totals	Big Year Records	Big Day Records
Alameda	393	267	151
Alpine	251	164	119*
Amador	263	251	134
Butte	334	none	171
Calaveras	263	none	143
Colusa	263	none	166
Contra Costa	356	247	170
Del Norte	426	none	167
El Dorado	312	251	122**
Fresno	330	257	169
Glenn	282	none	161
Humboldt	473	316	193
Imperial	438	294	172
Inyo	417	none	162
Kern	433	305	202
Kings	281	none	146
Lake	313	246	150
Lassen	331	232	148
Los Angeles	504	357	215
Madera	300	233	156
Marin	485	362	181*
Mariposa	268	202	none
Mendocino	410	310	167
Merced	310	227	155
Modoc	319	250	130
Mono	389	none	153
Monterey	490	353	208
Napa	313	none	148
Nevada	257	221	147
Orange	466	321	183*
Placer	327	268	180
Plumas	314	226	150
Riverside	454	306	199
Sacramento	310	169	123
San Benito	303	193	148
San Bernardino	445	334	157
San Diego	501	368	217
San Francisco	458	263	149
San Joaquin	334	239	164
San Luis Obispo	450	345	181
San Mateo	453	304	161
Santa Barbara	472	358	187
Santa Clara	394	291	177
Santa Cruz	439	316	153
Shasta	310	258	176
Sierra	272	none	148
Siskiyou	354	269	184
Solano	336	265	137
Sonoma	422	302	177
Stanislaus	297	234	147
Sutter	268	210	130
Tehama	273	none	128
Trinity	284	196	118
Tulare	337	274	175
Tuolumne	243	none	143
Ventura	473	333	186
Yolo	337	269	173
Yuba	260	219	163

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