Total Positive Counties: 38
| County | Human Cases | Dead Birds | Mosquito Samples | Sentinel Chickens | Horses |
| State Totals | 346 | 1332 | 3456 | 329 | 0 |
| Alameda | - | 11 | 2 | - | - |
| Alpine | - | - | - | - | - |
| Amador | - | - | - | - | - |
| Butte | 21 | 22 | 48 | 38 | - |
| Calaveras | - | - | - | - | - |
| Colusa | 2 | - | - | 9 | - |
| Contra Costa | 1 | 33 | 10 | 5 | - |
| Del Norte | - | - | - | - | - |
| El Dorado | 1 | 4 | - | - | - |
| Fresno | 9 | 6 | 184 | - | - |
| Glenn | 5 | 4 | 11 | 10 | - |
| Humboldt | - | - | - | - | - |
| Imperial | - | - | 1 | - | - |
| Inyo | - | - | - | - | - |
| Kern | 12 | - | 80 | - | - |
| Kings | 3 | 4 | 118 | - | - |
| Lake | 1 | 5 | 39 | 5 | - |
| Lassen | - | - | - | - | - |
| Los Angeles | 122 | 117 | 422 | 117 | - |
| Madera | 5 | 5 | 100 | - | - |
| Marin | - | 5 | - | - | - |
| Mariposa | - | - | - | - | - |
| Mendocino | - | - | - | - | - |
| Merced | - | 5 | 13 | 33 | - |
| Modoc | - | - | - | - | - |
| Mono | - | - | - | - | - |
| Monterey | 1 | - | - | - | - |
| Napa | - | 1 | 4 | - | - |
| Nevada | - | 2 | - | 1 | - |
| Orange | 28 | 85 | 416 | - | - |
| Placer | 6 | 30 | 103 | 7 | - |
| Plumas | - | - | - | - | - |
| Riverside | 4 | 16 | 32 | - | - |
| Sacramento | 22 | 411 | 455 | 3 | - |
| San Benito | - | - | - | - | - |
| San Bernardino | 7 | 5 | 79 | 20 | - |
| San Diego | 14 | 260 | 75 | 9 | - |
| San Francisco | - | - | - | - | - |
| San Joaquin | 7 | 37 | 350 | - | - |
| San Luis Obispo | - | - | - | - | - |
| San Mateo | - | 13 | 5 | - | - |
| Santa Barbara | - | - | - | - | - |
| Santa Clara | 1 | 88 | 13 | 1 | - |
| Santa Cruz | - | 2 | 3 | - | - |
| Shasta | 1 | 3 | 12 | 3 | - |
| Sierra | - | - | - | - | - |
| Siskiyou | - | - | - | - | - |
| Solano | 3 | 13 | 16 | 10 | - |
| Sonoma | - | 8 | 2 | - | - |
| Stanislaus | 22 | 14 | 258 | - | - |
| Sutter | 10 | 10 | 68 | 33 | - |
| Tehama | 5 | - | - | 8 | - |
| Trinity | - | - | - | - | - |
| Tulare | 9 | 3 | 260 | - | - |
| Tuolumne | - | - | - | - | - |
| Ventura | 2 | 34 | - | - | - |
| Yolo | 13 | 72 | 259 | 4 | - |
| Yuba | 9 | 4 | 18 | 13 | - |
| State Totals | 346 | 1332 | 3456 | 329 | 0 |