Total Positive Counties: 47
| County | Human Cases | Dead Birds | Mosquito Samples | Sentinel Chickens | Horses |
| State Totals | 553 | 510 | 3371 | 305 | 21 |
| Alameda | 1 | 2 | - | - | - |
| Alpine | - | - | - | - | - |
| Amador | - | - | - | - | - |
| Butte | 4 | 5 | 47 | 31 | - |
| Calaveras | - | - | - | 1 | - |
| Colusa | - | 1 | - | - | - |
| Contra Costa | 4 | 19 | 9 | 7 | 1 |
| Del Norte | - | - | - | - | - |
| El Dorado | - | 2 | - | - | - |
| Fresno | 13 | 5 | 167 | - | 1 |
| Glenn | - | 2 | 12 | 1 | 2 |
| Humboldt | - | 1 | - | - | - |
| Imperial | 3 | - | - | - | - |
| Inyo | 4 | - | 9 | - | - |
| Kern | 30 | 3 | 152 | - | 2 |
| Kings | 5 | 1 | 79 | - | - |
| Lake | - | 5 | 17 | 2 | - |
| Lassen | - | - | - | - | 3 |
| Los Angeles | 277 | 101 | 582 | 145 | 1 |
| Madera | 2 | 1 | 62 | - | - |
| Marin | - | 1 | - | - | - |
| Mariposa | - | - | - | - | - |
| Mendocino | - | - | - | - | - |
| Merced | 10 | 1 | 40 | 19 | - |
| Modoc | - | - | - | - | - |
| Mono | - | - | - | - | - |
| Monterey | - | 1 | - | - | - |
| Napa | - | - | - | - | - |
| Nevada | - | 1 | - | - | - |
| Orange | 33 | 57 | 280 | - | - |
| Placer | - | 4 | 59 | 5 | - |
| Plumas | - | - | - | - | 1 |
| Riverside | 32 | 41 | 196 | - | 4 |
| Sacramento | 6 | 86 | 153 | 2 | 1 |
| San Benito | - | - | - | 1 | - |
| San Bernardino | 57 | 45 | 295 | 36 | - |
| San Diego | 2 | 43 | 9 | - | 1 |
| San Francisco | 1 | 1 | - | - | - |
| San Joaquin | 14 | 7 | 242 | - | 2 |
| San Luis Obispo | - | 6 | - | - | - |
| San Mateo | - | 1 | - | - | - |
| Santa Barbara | - | 1 | 1 | 4 | - |
| Santa Clara | - | 15 | - | - | - |
| Santa Cruz | - | 1 | - | - | - |
| Shasta | 1 | 2 | - | 4 | - |
| Sierra | - | - | - | - | - |
| Siskiyou | - | - | - | - | - |
| Solano | 1 | 4 | 9 | 11 | - |
| Sonoma | - | 5 | 1 | - | - |
| Stanislaus | 28 | 6 | 196 | - | - |
| Sutter | 3 | 3 | 16 | 22 | - |
| Tehama | 2 | - | - | 4 | 1 |
| Trinity | - | - | - | - | - |
| Tulare | 12 | 8 | 630 | - | - |
| Tuolumne | - | - | - | - | 1 |
| Ventura | 1 | 2 | 3 | - | - |
| Yolo | 6 | 14 | 87 | 2 | - |
| Yuba | 1 | 6 | 18 | 8 | - |
| State Totals | 553 | 510 | 3371 | 305 | 21 |