California - 979.4 Dewey Decimal Numbers for U.S. States and Counties County Dewey Decimal Number Alameda 979.465 Alpine 979.443 Amador 979.442 Butte 979.432 Calaveras 979.444 Colusa 979.433 Contra Costa 979.463 Del Norte 979.411 El Dorado 979.441 Fresno 979.482 Glenn 979.431 Humboldt 979.412 Imperial 979.499 Inyo 979.487 Kern 979.488 Kings 979.485 Lake 979.417 Lassen 979.426 Los Angeles 979.493 Madera 979.481 Marin 979.462 Mariposa 979.446 Mendocino 979.415 Merced 979.458 Modoc 979.423 Mono 979.448 Monterey 979.476 Napa 979.419 Nevada 979.437 County Dewey Decimal Number Orange 979.496 Placer 979.438 Plumas 979.429 Riverside 979.497 Sacramento 979.453 San Benito 979.475 San Bernardino 979.495 San Diego 979.498 San Francisco 979.461 San Joaquin 979.455 San Luis Obispo 979.478 San Mateo 979.469 Santa Barbara 979.491 Santa Clara 979.473 Santa Cruz 979.471 Shasta 979.424 Sierra 979.436 Siskiyou 979.421 Solano 979.452 Sonoma 979.418 Stanislaus 979.457 Sutter 979.434 Tehama 979.427 Trinity 979.414 Tulare 979.486 Tuolumne 979.445 Ventura 979.492 Yolo 979.451 Yuba 979.435