*These data are provisional and may be revised or adjusted in the future.
Cumulative Human Disease Cases by County - California, 2004
| Butte County | 7 |
| Fresno County | 11 |
| Glenn County | 3 |
| Imperial County | 1 |
| Kern County | 59 |
| Lake County | 1 |
| Lassen County | 1 |
| Los Angeles County | 306 |
| Merced County | 1 |
| Orange County | 62 |
| Placer County | 1 |
| Riverside County | 109 |
| Sacramento County | 3 |
| San Bernardino County | 187 |
| San Diego County | 2 |
| San Joaquin County | 2 |
| San Luis Obispo County | 1 |
| Santa Clara County | 1 |
| Shasta County | 5 |
| Tehama County | 10 |
| Tulare County | 3 |
| Ventura County | 2 |
| Yolo County | 1 |