California County Statistical Summary

The species totals in each county may change often; many of these may not be up-to-date [last revised 5/08 but only the new totals submitted were updated]. 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	none	151
Alpine	251	164	119*
Amador	263	251	134
Butte	334	none	171
Calaveras	263	none	141
Colusa	263	none	166
Contra Costa	355	255	170
Del Norte	423	none	167
El Dorado	312	251	122**
Fresno	328	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	311	246	150
Lassen	331	232	148
Los Angeles	496	357	215
Madera	297	233	156
Marin	479	362	181*
Mariposa	268	153	none
Mendocino	403	299	167
Merced	310	227	155
Modoc	314	219	130
Mono	389	none	135**
Monterey	489	353	208
Napa	313	none	148
Nevada	257	180	147
Orange	466	321	183*
Placer	319	267	180
Plumas	314	211	150
Riverside	454	306	199
Sacramento	310	169	123
San Benito	303	193	148
San Bernardino	438	318	150
San Diego	495	358	217
San Francisco	458	263	149
San Joaquin	334	239	164
San Luis Obispo	450	345	181
San Mateo	430	304	161
Santa Barbara	472	337	187
Santa Clara	394	291	177
Santa Cruz	432	312	153
Shasta	310	258	176
Sierra	265	none	none
Siskiyou	354	269	184
Solano	336	265	137
Sonoma	422	302	177
Stanislaus	297	234	147
Sutter	268	none	127
Tehama	273	none	128
Trinity	271	196	113
Tulare	337	274	175
Tuolumne	243	none	108
Ventura	473	333	186
Yolo	337	249	173
Yuba	256	none	152