*These data are provisional and may be revised or adjusted in the future.
Cumulative Dead Bird Infections by County - California, 2004
| Alameda County | 23 |
| Alpine County | 3 |
| Amador County | 9 |
| Butte County | 118 |
| Calaveras County | 10 |
| Colusa County | 21 |
| Contra Costa County | 19 |
| Del Norte County | 3 |
| El Dorado County | 22 |
| Fresno County | 116 |
| Glenn County | 75 |
| Humboldt County | 17 |
| Imperial County | 1 |
| Inyo County | 12 |
| Kern County | 87 |
| Kings County | 11 |
| Lake County | 30 |
| Lassen County | 13 |
| Los Angeles County | 840 |
| Madera County | 7 |
| Marin County | 18 |
| Mariposa County | 5 |
| Mendocino County | 14 |
| Merced County | 28 |
| Modoc County | 1 |
| Mono County | 6 |
| Monterey County | 12 |
| Napa County | 6 |
| Nevada County | 26 |
| Orange County | 224 |
| Placer County | 48 |
| Plumas County | 26 |
| Riverside County | 139 |
| Sacramento County | 154 |
| San Benito County | 5 |
| San Bernardino County | 287 |
| San Diego County | 34 |
| San Francisco County | 15 |
| San Joaquin County | 57 |
| San Luis Obispo County | 15 |
| San Mateo County | 15 |
| Santa Barbara County | 7 |
| Santa Clara County | 46 |
| Santa Cruz County | 36 |
| Shasta County | 90 |
| Sierra County | 3 |
| Siskiyou County | 34 |
| Solano County | 17 |
| Sonoma County | 48 |
| Stanislaus County | 84 |
| Sutter County | 28 |
| Tehama County | 115 |
| Trinity County | 9 |
| Tulare County | 48 |
| Tuolumne County | 33 |
| Ventura County | 23 |
| Yolo County | 26 |
| Yuba County | 13 |