Appendix A
| ISAWS Counties (35) | County Code |
| Alpine | 2 |
| Amador | 3 |
| Butte | 4 |
| Calaveras | 5 |
| Colusa | 6 |
| Del Norte | 8 |
| El Dorado | 9 |
| Glenn | 11 |
| Humboldt | 12 |
| Imperial | 13 |
| Inyo | 14 |
| Kern | 15 |
| Kings | 16 |
| Lake | 17 |
| Lassen | 18 |
| Madera | 20 |
| Marin | 21 |
| Mariposa | 22 |
| Mendocino | 23 |
| Modoc | 25 |
| Mono | 26 |
| Monterey | 27 |
| Napa | 28 |
| Nevada | 29 |
| Plumas | 32 |
| San Benito | 35 |
| San Joaquin | 39 |
| Shasta | 45 |
| Sierra | 46 |
| Siskiyou | 47 |
| Sutter | 51 |
| Tehama | 52 |
| Trinity | 53 |
| Tuolumne | 55 |
| Yuba | 58 |