Total Positive Counties: 37
| County | Human Cases | Dead Birds | Mosquito Samples | Sentinel Chickens | Horses |
| State Totals | 231 | 1830 | 2659 | 274 | 0 |
| Alameda | - | 73 | 15 | - | - |
| Alpine | - | - | - | - | - |
| Amador | - | - | - | - | - |
| Butte | 16 | 19 | 37 | 34 | - |
| Calaveras | - | - | - | - | - |
| Colusa | 2 | 4 | 1 | 6 | - |
| Contra Costa | 1 | 35 | 19 | 13 | - |
| Del Norte | - | - | - | - | - |
| El Dorado | - | 1 | - | - | - |
| Fresno | 25 | 8 | 114 | - | - |
| Glenn | 6 | 4 | 8 | 8 | - |
| Humboldt | - | 2 | - | - | - |
| Imperial | 1 | - | - | - | - |
| Inyo | - | - | - | - | - |
| Kern | 3 | 3 | 90 | - | - |
| Kings | 2 | 2 | 138 | - | - |
| Lake | 1 | 15 | 67 | 2 | - |
| Lassen | - | - | - | - | - |
| Los Angeles | 32 | 47 | 192 | 82 | - |
| Madera | 2 | 4 | 33 | - | - |
| Marin | - | 3 | 3 | - | - |
| Mariposa | - | - | - | - | - |
| Mendocino | - | - | - | - | - |
| Merced | - | 1 | 10 | 6 | - |
| Modoc | - | - | - | - | - |
| Mono | - | - | - | - | - |
| Monterey | - | - | - | - | - |
| Napa | - | 9 | - | - | - |
| Nevada | - | - | - | - | - |
| Orange | 85 | 228 | 315 | - | - |
| Placer | 1 | 27 | 73 | - | - |
| Plumas | - | - | - | - | - |
| Riverside | 1 | - | 56 | 7 | - |
| Sacramento | 4 | 256 | 442 | 8 | - |
| San Benito | - | - | - | - | - |
| San Bernardino | 4 | 13 | 79 | 16 | - |
| San Diego | 2 | 7 | - | - | - |
| San Francisco | - | - | - | - | - |
| San Joaquin | 3 | 42 | 182 | - | - |
| San Luis Obispo | - | - | - | - | - |
| San Mateo | - | 9 | 12 | - | - |
| Santa Barbara | - | - | - | - | - |
| Santa Clara | 5 | 801 | 29 | 2 | - |
| Santa Cruz | - | 1 | - | - | - |
| Shasta | 1 | 5 | 32 | 7 | - |
| Sierra | - | - | - | - | - |
| Siskiyou | - | - | - | - | - |
| Solano | 1 | 32 | 11 | 19 | - |
| Sonoma | - | 15 | 5 | 1 | - |
| Stanislaus | 20 | 35 | 113 | 12 | - |
| Sutter | 2 | 19 | 51 | 26 | - |
| Tehama | 1 | - | - | 8 | - |
| Trinity | - | - | - | - | - |
| Tulare | 7 | 38 | 308 | 4 | - |
| Tuolumne | - | - | - | - | - |
| Ventura | - | 2 | - | - | - |
| Yolo | - | 54 | 200 | 6 | - |
| Yuba | 3 | 16 | 24 | 7 | - |
| State Totals | 231 | 1830 | 2659 | 274 | 0 |