Total Positive Counties: 41
| County | Human Cases | Dead Birds | Mosquito Samples | Sentinel Chickens | Horses |
| State Totals | 86 | 907 | 1854 | 267 | 8 |
| Alameda | - | 12 | - | - | - |
| Alpine | - | - | - | - | - |
| Amador | - | - | - | - | - |
| Butte | 8 | 39 | 29 | 39 | - |
| Calaveras | - | - | - | - | - |
| Colusa | 1 | 1 | - | 8 | - |
| Contra Costa | 2 | 52 | 12 | 4 | - |
| Del Norte | - | - | - | - | - |
| El Dorado | 1 | - | - | - | - |
| Fresno | 2 | 7 | 45 | - | - |
| Glenn | 4 | 8 | 16 | 9 | - |
| Humboldt | - | 1 | - | - | - |
| Imperial | - | - | - | - | - |
| Inyo | - | - | - | - | - |
| Kern | 6 | 2 | 140 | 2 | 1 |
| Kings | - | 10 | 66 | - | - |
| Lake | - | 7 | 52 | 5 | - |
| Lassen | - | - | - | - | - |
| Los Angeles | 35 | 271 | 283 | 81 | - |
| Madera | - | 7 | 14 | - | - |
| Marin | 1 | 5 | - | 1 | - |
| Mariposa | - | - | - | - | - |
| Mendocino | - | 2 | - | - | - |
| Merced | - | 31 | 7 | 11 | - |
| Modoc | - | - | - | - | - |
| Mono | - | - | - | - | - |
| Monterey | - | - | - | - | - |
| Napa | 1 | 1 | - | - | - |
| Nevada | - | 6 | - | - | - |
| Orange | 1 | 20 | 11 | - | - |
| Placer | 1 | 25 | 85 | 6 | 1 |
| Plumas | - | - | - | - | - |
| Riverside | 3 | 18 | 48 | 18 | 1 |
| Sacramento | 3 | 122 | 311 | 2 | 3 |
| San Benito | - | - | - | - | - |
| San Bernardino | 1 | 16 | 165 | 13 | - |
| San Diego | - | 5 | - | - | - |
| San Francisco | 1 | - | - | - | - |
| San Joaquin | 3 | 28 | 106 | - | - |
| San Luis Obispo | - | 1 | 1 | - | - |
| San Mateo | - | - | - | - | - |
| Santa Barbara | - | - | - | - | - |
| Santa Clara | 1 | 45 | 22 | - | - |
| Santa Cruz | - | 1 | 1 | - | - |
| Shasta | - | 27 | 10 | 6 | - |
| Sierra | - | - | - | - | - |
| Siskiyou | - | - | - | - | - |
| Solano | 1 | 6 | 1 | 5 | - |
| Sonoma | - | 9 | - | - | - |
| Stanislaus | 3 | 11 | 81 | 8 | 2 |
| Sutter | 3 | 14 | 61 | 30 | - |
| Tehama | - | 3 | - | 1 | - |
| Trinity | - | 1 | - | - | - |
| Tulare | - | 3 | 57 | - | - |
| Tuolumne | - | 1 | - | - | - |
| Ventura | 1 | 7 | - | - | - |
| Yolo | 3 | 75 | 216 | 9 | - |
| Yuba | - | 7 | 14 | 9 | - |
| State Totals | 86 | 907 | 1854 | 267 | 8 |