Total Positive Counties: 48
| County | Human Cases | Dead Birds | Mosquito Samples | Sentinel Chickens | Horses |
| State Totals | 173 | 823 | 771 | 189 | 18 |
| Alameda | - | 7 | - | - | - |
| Alpine | - | - | - | - | - |
| Amador | - | 1 | 1 | - | - |
| Butte | 10 | 27 | 5 | 14 | - |
| Calaveras | - | 3 | - | - | - |
| Colusa | 1 | 1 | - | 2 | - |
| Contra Costa | - | 15 | 22 | 3 | - |
| Del Norte | - | - | - | - | - |
| El Dorado | - | 2 | - | - | - |
| Fresno | 10 | 90 | 50 | 20 | 1 |
| Glenn | 7 | 32 | 1 | 8 | - |
| Humboldt | - | 2 | - | - | - |
| Imperial | 2 | - | 4 | 16 | - |
| Inyo | - | 1 | - | - | - |
| Kern | 92 | 105 | 175 | 40 | 3 |
| Kings | 2 | 2 | 25 | 7 | 1 |
| Lake | - | 2 | 6 | 1 | - |
| Lassen | - | 2 | - | - | - |
| Los Angeles | 6 | 57 | 55 | 1 | - |
| Madera | - | 3 | 7 | - | - |
| Marin | - | - | - | - | - |
| Mariposa | - | - | - | - | - |
| Mendocino | 1 | 1 | - | - | - |
| Merced | 3 | 24 | 1 | - | - |
| Modoc | - | 1 | - | - | - |
| Mono | - | - | - | - | - |
| Monterey | - | - | - | - | - |
| Napa | - | - | - | - | - |
| Nevada | - | 2 | - | - | - |
| Orange | 2 | 9 | 3 | - | - |
| Placer | - | 11 | 18 | 3 | - |
| Plumas | - | 1 | - | - | - |
| Riverside | 1 | 3 | 22 | 22 | - |
| Sacramento | 10 | 77 | 119 | 9 | 2 |
| San Benito | - | - | - | - | - |
| San Bernardino | 1 | 10 | 2 | 7 | - |
| San Diego | - | 44 | - | - | 3 |
| San Francisco | - | - | - | - | - |
| San Joaquin | 3 | 30 | 127 | 6 | 1 |
| San Luis Obispo | - | 5 | - | - | - |
| San Mateo | - | 1 | - | - | - |
| Santa Barbara | - | 1 | - | - | - |
| Santa Clara | 2 | 50 | 8 | - | - |
| Santa Cruz | - | 4 | - | - | - |
| Shasta | 2 | 41 | 16 | 2 | 2 |
| Sierra | - | - | - | - | - |
| Siskiyou | - | 1 | - | - | - |
| Solano | 1 | 1 | - | 1 | - |
| Sonoma | 1 | 1 | - | - | 2 |
| Stanislaus | 10 | 101 | 63 | 5 | - |
| Sutter | 2 | 1 | 21 | 9 | - |
| Tehama | 3 | 17 | 1 | 7 | 1 |
| Trinity | - | 1 | - | - | - |
| Tulare | - | 13 | 10 | - | 2 |
| Tuolumne | - | 1 | - | - | - |
| Ventura | - | 3 | - | - | - |
| Yolo | 1 | 15 | 7 | 3 | - |
| Yuba | - | 1 | 2 | 3 | - |
| State Totals | 173 | 823 | 771 | 189 | 18 |