Wikipedia:WikiProject U.S. Roads/California/History/Old highway names

The following names were used by the highway department:


 * Route 1, Sausalito to Crescent City
 * Redwood Highway


 * Route 1, Crescent City to Oregon
 * Crescent City-Grants Pass Connection


 * Route 2, San Francisco to San Diego
 * Coast Route


 * Route 3, Sacramento to Oregon
 * Pacific Highway (East Side): south of Red Bluff
 * Pacific Highway: north of Red Bluff


 * Route 4, Sacramento to Los Angeles
 * Valley Route


 * Route 5, Stockton to Santa Cruz
 * Livermore Valley Lateral
 * Santa Cruz Lateral
 * Stockton-Santa Cruz Highway


 * Route 6, Sacramento to Davis


 * Route 7, Benicia to Red Bluff
 * Pacific Highway (West Side)


 * Route 8, Novato to Fairfield


 * Route 9, San Fernando to San Bernardino
 * San Bernardino County Lateral


 * Route 10, Hanford to Visalia
 * Visalia-Hanford Lateral


 * Route 10, San Lucas to Hanford
 * Coalinga Lateral


 * Route 10, Visalia to Sequoia Park
 * San Marcos-Sequoia Park Highway


 * Route 11, Sacramento to Nevada
 * Placerville-Tahoe Highway (entire route)


 * Route 12, San Diego to El Centro
 * San Diego-El Centro Highway


 * Route 13, Salida to Sonora
 * Sonora Lateral


 * Route 13, Sonora to east of Sonora Pass
 * Sonora-Mono Lateral


 * Route 14, Oakland to Martinez


 * Route 15, Ukiah to Emigrant Gap
 * Tahoe-Ukiah Highway


 * Route 16, Hopland to Lakeport
 * Lakeport Lateral, Hopland-Lakeport Lateral


 * Route 17, Roseville to Nevada City
 * Nevada City Lateral, Auburn-Nevada City Lateral


 * Route 18, Merced to Mariposa
 * Mariposa Lateral, Mariposa County Lateral


 * Route 18, Mariposa to Yosemite Park


 * Route 19, west of Claremont to Riverside
 * Riverside Lateral


 * Route 20, Weaverville to Redding
 * Trinity Lateral, Trinity County Lateral


 * Route 20, Arcata to Weaverville
 * Humboldt-Trinity Lateral


 * Route 21, Richvale to Oroville
 * Oroville Lateral


 * Route 21, Oroville to Quincy
 * Feather River Lateral
 * Oroville-Quincy Lateral, Quincy Lateral, Plumas County Lateral


 * Route 22, north of Hollister to San Juan Bautista
 * Hollister-Pacheco Pass Lateral


 * Route 23, Saugus to Sauth Lake Tahoe
 * East of Sierras Highway


 * Route 24, Lodi to southeast of Markleeville


 * Route 25, Nevada City to Downieville
 * Downieville Lateral, Sierra County Lateral


 * Route 26, San Bernardino to El Centro


 * Route 27, El Centro to Arizona
 * El Centro-Yuma Highway


 * Route 28, Redding to Nevada
 * Alturas Lateral
 * Modoc County Lateral
 * Redding-Alturas Lateral


 * Route 29, Red Bluff to Nevada
 * Red Bluff-Susanville Highway
 * Susanville Lateral, Red Bluff-Susanville Lateral


 * Route 31, San Bernardino to Nevada


 * Route 32, Chowchilla to Gilroy
 * Pacheco Pass Lateral, Pacheco Pass Road


 * Route 33, Bakersfield to Paso Robles
 * Cholame Lateral


 * Route 34, Galt to southeast of Luther Pass
 * Jackson Lateral, Amador County Lateral


 * Route 35, Mad River to Peanut


 * Route 36, Downieville northwest


 * Route 37, Auburn to Truckee
 * Colfax-Truckee Highway


 * Route 38, South Lake Tahoe to Nevada


 * Route 39, Tahoe City to Nevada


 * Route 40, west of Chinese Camp to Lee Vining


 * Route 41, General Grant Grove to Kings Canyon


 * Route 42, Saratoga Gap to Redwood Park
 * Saratoga-Blooms Mills Highway


 * Route 43, Waterman Canyon to Big Bear Lake
 * Big Bear Lake Highway


 * Route 44, Boulder Creek to Redwood Park


 * Route 45, Biggs to Willows


 * Route 46, north of Yreka to Klamath


 * Route 47, Orland to Chico
 * Chico-Orland Lateral


 * Route 48, Cloverdale to Albion


 * Route 49, Calistoga to north of Lower Lake


 * Route 50, northeast of Lower Lake to Rumsey
 * Yolo-Lake Lateral


 * Route 51, Santa Rosa to Sonoma


 * Route 52, Tiburon to Mill Valley


 * Route 53, Fairfield to Lodi
 * Fairfield-Rio Vista Lateral, Rio Vista Lateral


 * Route 54, east of Sloughhouse to Plymouth


 * Route 55, San Francisco to north of Santa Cruz
 * Skyline Boulevard


 * Route 56, Cambria to Carmel
 * Carmel-San Simeon Highway


 * Route 57, Santa Maria to Freeman Junction
 * Cuyama Lateral (west of Bakersfield)


 * Route 58, Mojave to Arizona


 * Route 59, Gorman to Lancaster


 * Route 60, El Rio to San Juan Capistrano


 * Route 61, La Canada Flintridge to Red Box Gap
 * Arroyo Seco Highway


 * Route 62, Azusa to San Gabriel Canyon


 * Route 63, Big Pine to Oasis


 * Route 64, Mecca to Blythe


 * Route 65, Auburn to Sonora
 * Mother Lode Highway


 * Route 66, Lathrop to Manteca


 * Route 67, San Juan Bautista to Chittenden


 * Route 68, San Francisco to San Jose
 * Bayshore Highway


 * Route 69, San Rafael to Point San Quentin


 * Route 70, Ukiah to Mendocino State Hospital


 * Route 71, Crescent City to Oregon

This comes from the Assembly Journal, as follows: And other sources:
 * 1931 pp. 796-797
 * 
 * 
 *