Total Positive Counties: 40
| County | Human Cases | Dead Birds | Mosquito Samples | Sentinel Chickens | Horses |
| State Totals | 675 | 1334 | 3326 | 449 | 0 |
| Alameda | - | 18 | 16 | - | - |
| Alpine | - | - | - | - | - |
| Amador | - | - | - | - | - |
| Butte | 53 | 38 | 94 | 37 | - |
| Calaveras | - | - | - | - | - |
| Colusa | 1 | 3 | - | 10 | - |
| Contra Costa | 1 | 11 | 8 | 18 | - |
| Del Norte | - | - | - | - | - |
| El Dorado | - | 4 | - | - | - |
| Fresno | 7 | 3 | 108 | - | - |
| Glenn | 19 | 4 | 21 | 10 | - |
| Humboldt | - | 2 | - | - | - |
| Imperial | - | - | - | - | - |
| Inyo | - | - | - | - | - |
| Kern | 11 | 1 | 135 | - | - |
| Kings | - | 3 | 144 | - | - |
| Lake | 2 | 5 | 31 | 4 | - |
| Lassen | - | - | - | - | - |
| Los Angeles | 217 | 100 | 294 | 138 | - |
| Madera | 4 | 1 | 21 | - | - |
| Marin | 1 | 3 | - | - | - |
| Mariposa | - | - | - | - | - |
| Mendocino | 1 | - | - | - | - |
| Merced | 1 | 3 | 8 | 23 | - |
| Modoc | - | - | - | - | - |
| Mono | - | - | - | - | - |
| Monterey | - | - | - | - | - |
| Napa | - | 7 | - | - | - |
| Nevada | 2 | 10 | - | 4 | - |
| Orange | 81 | 83 | 574 | - | - |
| Placer | - | 21 | 52 | 8 | - |
| Plumas | - | - | - | - | - |
| Riverside | 121 | 82 | 158 | 22 | - |
| Sacramento | 3 | 103 | 164 | 2 | - |
| San Benito | - | - | - | - | - |
| San Bernardino | 46 | 25 | 290 | 36 | - |
| San Diego | 38 | 344 | 46 | 12 | - |
| San Francisco | - | - | - | - | - |
| San Joaquin | 2 | 18 | 208 | - | - |
| San Luis Obispo | - | - | - | - | - |
| San Mateo | - | 23 | 5 | - | - |
| Santa Barbara | - | 3 | 1 | - | - |
| Santa Clara | 8 | 231 | 20 | 5 | - |
| Santa Cruz | - | - | - | - | - |
| Shasta | 3 | 16 | 48 | 22 | - |
| Sierra | - | - | - | - | - |
| Siskiyou | 1 | - | - | - | - |
| Solano | 1 | 10 | 6 | 7 | - |
| Sonoma | - | 11 | 12 | - | - |
| Stanislaus | 12 | 14 | 84 | 9 | - |
| Sutter | 2 | 16 | 54 | 36 | - |
| Tehama | 5 | - | - | 18 | - |
| Trinity | - | 2 | - | - | - |
| Tulare | 10 | 23 | 528 | - | - |
| Tuolumne | - | - | - | - | - |
| Ventura | 6 | 26 | - | 11 | - |
| Yolo | 8 | 61 | 173 | 6 | - |
| Yuba | 8 | 6 | 23 | 11 | - |
| State Totals | 675 | 1334 | 3326 | 449 | 0 |