Total Positive Counties: 40
| County | Human Cases | Dead Birds | Mosquito Samples | Sentinel Chickens | Horses |
| State Totals | 300 | 1016 | 2890 | 330 | 0 |
| Alameda | - | 17 | 10 | - | - |
| Alpine | - | - | - | - | - |
| Amador | - | - | - | - | - |
| Butte | 50 | 38 | 94 | 37 | - |
| Calaveras | - | - | - | - | - |
| Colusa | 1 | 3 | - | 10 | - |
| Contra Costa | - | 9 | 6 | 16 | - |
| Del Norte | - | - | - | - | - |
| El Dorado | - | 3 | - | - | - |
| Fresno | 6 | 3 | 105 | - | - |
| Glenn | 19 | 4 | 21 | 9 | - |
| Humboldt | - | 2 | - | - | - |
| Imperial | - | - | - | - | - |
| Inyo | - | - | - | - | - |
| Kern | 8 | 1 | 135 | - | - |
| Kings | - | 3 | 143 | - | - |
| Lake | 2 | 5 | 31 | 4 | - |
| Lassen | - | - | - | - | - |
| Los Angeles | 54 | 41 | 175 | 62 | - |
| Madera | 3 | 1 | 20 | - | - |
| Marin | 1 | 3 | - | - | - |
| Mariposa | - | - | - | - | - |
| Mendocino | 1 | - | - | - | - |
| Merced | - | 2 | 8 | 20 | - |
| Modoc | - | - | - | - | - |
| Mono | - | - | - | - | - |
| Monterey | - | - | - | - | - |
| Napa | - | 7 | - | - | - |
| Nevada | 2 | 10 | - | 4 | - |
| Orange | 26 | 54 | 395 | - | - |
| Placer | - | 21 | 49 | 8 | - |
| Plumas | - | - | - | - | - |
| Riverside | 47 | 65 | 142 | 14 | - |
| Sacramento | 1 | 94 | 150 | 2 | - |
| San Benito | - | - | - | - | - |
| San Bernardino | 19 | 23 | 237 | 25 | - |
| San Diego | 8 | 217 | 26 | 2 | - |
| San Francisco | - | - | - | - | - |
| San Joaquin | 2 | 16 | 204 | - | - |
| San Luis Obispo | - | - | - | - | - |
| San Mateo | - | 16 | 5 | - | - |
| Santa Barbara | - | - | 1 | - | - |
| Santa Clara | 5 | 185 | 19 | 5 | - |
| Santa Cruz | - | - | - | - | - |
| Shasta | 3 | 15 | 48 | 20 | - |
| Sierra | - | - | - | - | - |
| Siskiyou | 1 | - | - | - | - |
| Solano | 1 | 10 | 5 | 7 | - |
| Sonoma | - | 8 | 11 | - | - |
| Stanislaus | 11 | 13 | 76 | 9 | - |
| Sutter | 2 | 16 | 54 | 36 | - |
| Tehama | 5 | - | - | 18 | - |
| Trinity | - | 2 | - | - | - |
| Tulare | 7 | 22 | 526 | - | - |
| Tuolumne | - | - | - | - | - |
| Ventura | 1 | 22 | - | 5 | - |
| Yolo | 7 | 59 | 171 | 6 | - |
| Yuba | 7 | 6 | 23 | 11 | - |
| State Totals | 300 | 1016 | 2890 | 330 | 0 |