Total Positive Counties: 39
| County | Human Cases | Dead Birds | Mosquito Samples | Sentinel Chickens | Horses |
| State Totals | 77 | 508 | 1768 | 150 | 0 |
| Alameda | - | 12 | 3 | - | - |
| Alpine | - | - | - | - | - |
| Amador | - | - | - | - | - |
| Butte | 36 | 30 | 85 | 35 | - |
| Calaveras | - | - | - | - | - |
| Colusa | - | 3 | - | 10 | - |
| Contra Costa | - | 3 | 2 | 6 | - |
| Del Norte | - | - | - | - | - |
| El Dorado | - | 2 | - | - | - |
| Fresno | - | 1 | 50 | - | - |
| Glenn | 11 | 4 | 21 | 6 | - |
| Humboldt | - | 2 | - | - | - |
| Imperial | - | - | - | - | - |
| Inyo | - | - | - | - | - |
| Kern | 3 | 1 | 103 | - | - |
| Kings | - | 3 | 79 | - | - |
| Lake | 1 | 3 | 20 | 2 | - |
| Lassen | - | - | - | - | - |
| Los Angeles | 1 | 4 | 64 | 2 | - |
| Madera | - | 1 | 5 | - | - |
| Marin | - | 3 | - | - | - |
| Mariposa | - | - | - | - | - |
| Mendocino | 1 | - | - | - | - |
| Merced | - | 1 | 7 | 8 | - |
| Modoc | - | - | - | - | - |
| Mono | - | - | - | - | - |
| Monterey | - | - | - | - | - |
| Napa | - | 3 | - | - | - |
| Nevada | 2 | 8 | - | - | - |
| Orange | 1 | 22 | 86 | - | - |
| Placer | - | 5 | 44 | 5 | - |
| Plumas | - | - | - | - | - |
| Riverside | 3 | 34 | 112 | - | - |
| Sacramento | - | 56 | 92 | 1 | - |
| San Benito | - | - | - | - | - |
| San Bernardino | 1 | 7 | 115 | 5 | - |
| San Diego | - | 87 | 8 | - | - |
| San Francisco | - | - | - | - | - |
| San Joaquin | 1 | 10 | 134 | - | - |
| San Luis Obispo | - | - | - | - | - |
| San Mateo | - | 7 | 4 | - | - |
| Santa Barbara | - | - | 1 | - | - |
| Santa Clara | 1 | 72 | 5 | - | - |
| Santa Cruz | - | - | - | - | - |
| Shasta | - | 8 | 41 | 13 | - |
| Sierra | - | - | - | - | - |
| Siskiyou | - | - | - | - | - |
| Solano | - | 7 | 4 | 3 | - |
| Sonoma | - | 4 | 8 | - | - |
| Stanislaus | 3 | 10 | 27 | 6 | - |
| Sutter | 2 | 16 | 50 | 26 | - |
| Tehama | 2 | - | - | 7 | - |
| Trinity | - | 2 | - | - | - |
| Tulare | 4 | 22 | 435 | - | - |
| Tuolumne | - | - | - | - | - |
| Ventura | - | 6 | - | 3 | - |
| Yolo | 1 | 43 | 140 | 1 | - |
| Yuba | 3 | 6 | 23 | 11 | - |
| State Totals | 77 | 508 | 1768 | 150 | 0 |