California county routes in zone S

County Route S1 (CR S1), also known as Sunrise Highway for a portion of its length, is a long county highway located entirely in San Diego County, California, United States. It begins at State Route 94 (SR 94) near Barrett and moves northward across Interstate 8 (I-8), just west of the Laguna Summit. This segment is also known as Buckman Springs Road. North of I-8, it is the Sunrise Scenic Byway, a National Forest Scenic Byway. ;Route description The route begins at SR 94 near Barrett not far from the Mexican border. From there, it heads northward along Buckman Springs Road. Soon afterwards, it enters the Cleveland National Forest. When the road reaches Interstate 8, while Buckman Springs Road continues northeastward across the freeway, CR S1 continues in a northwest direction along Old Highway 80, the original alignment of U.S. Route 80 in California. It then closely parallels I-8 for several miles. Upon crossing the freeway at Laguna Junction, CR S1 separates from Old Highway 80 and becomes Sunrise Scenic Byway. From Interstate 8, it begins its ascent into the Laguna Mountains. The route here was built along a cliff overlooking Pine Valley to its west. Around here, the vegetation still consists of chaparral and sagebrush. As the route gains elevation through Cleveland National Forest, the route becomes more heavily forested. Around here, numerous campgrounds dot the side of the road. There is a picnic area overlooking Anza-Borrego Desert State Park near the Burnt Rancheria Campground, which is often said to deeply contrast the forest scenery along the route. The northern segment of the route was also established as a Scenic Byway in 1959. ;Major intersections ;Gallery Sandiegos1photoa.jpg|Bridge over Cottonwood Creek Sandiegocountys1photob.jpg|Buckman Springs Road and Old Highway 80 Sandiegocountys1photoc.jpg|Bridge over I-8 Sandiegocountys1photod.jpg|CR S1 near Al Bahr Shrine Camp Sandiegocountys1photoe.jpg|California Riding and Hiking Trail Sandiegocountys1photof.jpg|Junction with SR 79 ==S2==

County Route S2 (CR S2) is a county highway in the U.S. state of California. It runs for , north–south, in Imperial County and San Diego County. CR S2 is the third longest county route in California and is almost exclusively a two-lane rural road. It largely follows the route of the former Southern Emigrant Trail and Butterfield Overland Mail. ;Route description Starting at mile marker zero, the highway begins at a junction with State Route 79 near the community of Warner Springs. As it descends southeast toward the desert floor it becomes San Felipe Road until it crosses State Route 78 at Scissors Crossing in Shelter Valley (formerly called Earthquake Valley). South of SR 78, the name of the highway changes to the Great Southern Overland Stage Route of 1849. It passes through Blair Valley, Canebrake Canyon, Vallecito, and Agua Caliente. Further south, it forks at a remote junction with the historic dirt road to become to Sweeney Pass Road. Sweeney Pass is located between the Volcanic Hills and the Coyote Mountains. East of the San Diego/Imperial County Line of this segment is also called Imperial Highway. The highway runs south through an interchange with Interstate 8 then ends at a junction with State Route 98 near Ocotillo. ;Gallery Highways2signs.jpg|Street signs on CR S2 Sanfeliperoad1.jpg|San Felipe Road north of Scissors Crossing Anza Borrego Agua Caliente.jpg|Agua Caliente Springs, desert landscape and CR S2 going south, in Anza-Borrego Desert State Park. Borrego Springs, California as seen from County Route S2.jpg|Borrego Springs and the surrounding desert as seen from the descent near the Montezuma Valley Road lookout. Shelter Valley as seen from the Pacific Crest Trail north of the community.jpg|Scissors crossing seen from the north, along the Pacific Crest Trail.: Shelter Valley California Fire Department and Community Center (2011).jpg|Shelter Valley California Fire Department and Community Center on CR S2. Warner's Ranch (WEST ELEVATION OF RANCH HOUSE).jpg|Warner's Ranch, Ranch House, San Felipe Road (CR S2), Warner Springs. ;Major intersections ==S3==

County Route S3 (CR S3) is a county highway in San Diego County, California, United States. It begins at a junction with State Route 78 and runs roughly north over Yaqui Pass to Borrego Springs, bearing the name Yaqui Pass Road. It turns left onto Deep Well Trail and left again onto Borrego Springs Road. It ends at a junction with County Route S22 at a large roundabout known as Christmas Circle. Its total length is . There is one call box on this highway, located at Yaqui Pass summit. The highway is part of the Juan Bautista de Anza National Historic Trail Auto Tour Route. File:SD-CR-S3 CA-78 junction.jpg|Junction with State Route 78 File:Yaqui Pass Road.png|Yaqui Pass Road CR S3 west of Yaqui Pass File:Yaqui_Pass.png|Yaqui Pass on CR S3 ;Major intersections ==S4==

County Route S4 (CR S4) is a road in San Diego County, California, United States, in the northern city limits of San Diego and in the city of Poway. The route is traversed entirely by Poway Road from Interstate 15 east to State Route 67. The route's western terminus is at I-15, where the road continues west as Rancho Penasquitos Boulevard, traverses across SR 56, and finally ends as Carmel Mountain Road. Eastward, the road traverses through the city of Poway as Poway Road and has its east end at SR 67. Within Poway, it is one of the busiest streets in the city. The route was established in 1959. ;Major intersections ==S5==

County Route S5 (CR S5) is a road in San Diego County, California, United States, in Poway and San Diego. It runs from its southern end at Poway Road (County Route S4) in Poway to its northern end at Interstate 15 in San Diego. ;Route description The road's south end is at Poway Road (CR S4) in Poway. It winds north through Poway as Espola Road and then turns slightly west, ending at Interstate 15 as Rancho Bernardo Road (which continues past I-15). The route was established in 1959. ;Major intersections ==S6==

County Route S6 (CR S6) is a county highway in San Diego County, California, United States. It connects Del Mar with Palomar Mountain across San Diego County. It is one of a few San Diego county routes with a discontinuity in its routing. ;Route description CR S6 starts at CR S21 in Del Mar as Via de la Valle. It crosses Interstate 5 and meets with CR S8 in Rancho Santa Fe at the intersection of Via de la Valle and Paseo Delicias. At El Camino Del Norte, the name changes to Del Dios Highway, past the community of Del Dios and into Escondido. In Escondido, CR S6 runs along West and East Valley Parkways, to Valley Center Road through Valley Center. CR S6 ends at State Route 76. About east on SR 76, CR S6 begins again as South Grade Road, which winds northward on Palomar Mountain. It intersects with CR S7, then continues north until it ends at the Palomar Observatory. The route was defined in 1959. ;Major intersections ==S7==

County Route S7 (CR S7) is a county highway in San Diego County, California, United States, that provides access to Palomar Mountain. ;Route description CR S7's western terminus is at State Route 76 east of Pauma Valley, California. It begins as a dirt road known as the Nate Harrison Grade. Then it returns to pavement as it ascends Palomar Mountain and meets San Diego County Route S6. It enters Palomar Mountain State Park. Then, it descends to end at SR 76 near Lake Henshaw. Nate Harrison Grade is not signed as County Route S7, but it is a logical westward extension of the signed portion. With a 10% grade, it was the only road to the top of Palomar Mountain until the 1940s, when East Grade Road ("Highway to the Stars") was built for the construction of the Palomar Observatory. The road was formerly known as "Nigger Nate Road", named after Nate Harrison, an early African-American homesteader. The name was changed in 1956 at the request of the NAACP. On a small turnout is a monument to Gregory Pacheco and a good view to the north. According to a plaque at the monument, pictured below, Gregory Pacheco was a firefighter who died in the La Jolla Fire in 1999. The descent on the eastern side of Palomar Mountain offers panoramic views of Lake Henshaw. File:Sandiegocountys7d.jpg|East end on Highway 76 File:Lakehenshaw lookout.jpg|Lake Henshaw from lookout on County Highway S7 File:Sandiegocountys7b.jpg|Gregory Pacheco monument File:Sandiegocountys7c.jpg|Gregory Pacheco monument File:Sandiegocountys7a.jpg|West end at entrance to Palomar Mountain State Park ;Major intersections ==S8==

County Route S8 (CR S8) is a county highway, mostly along Lomas Santa Fe Drive and Linea Del Cielo, in San Diego County, California, United States. Its western end is CR S21 (locally signed as "Highway 101") in Solana Beach and its eastern end is at Via De La Valle in Rancho Santa Fe. ;Route description The route begins in Solana Beach at Old Highway 101. It winds eastward through San Diego County, crossing through Solana Beach and unincorporated San Diego County, and ends at Via De La Valle (CR S6) in Rancho Santa Fe. The last portion of the county road passes through Rancho Santa Fe on Paseo Delicias. ;Major intersections ==S9==

County Route S9 (CR S9), mostly known as Encinitas Boulevard, is a road in San Diego County, California, United States. Its west end is at CR S21 (Coast Highway 101) in Encinitas and its east end is at Paseo Delicias (CR S6) in Rancho Santa Fe. Once outside Encinitas, the county route follows portions of Rancho Santa Fe Road, La Bajada, Los Morros, and La Granada, before terminating at Paseo Delicias. ;Major intersections ==S10==

County Route S10 (CR S10), known entirely as Rancho Santa Fe Road, is a road in San Diego County, California, United States, that runs through the North County region of San Diego County. ;Route description CR S10 begins at Encinitas Boulevard in Encinitas, heading in a generally northward direction. It enters Carlsbad and turns eastward. This road travels into San Marcos and passes near the unincorporated area of Lake San Marcos. (The entire run of the road past Carlsbad is located in parts of the incorporated city of San Marcos; often, at this point, the incorporated portions only follow the road, leaving unincorporated islands nearby). Rancho Santa Fe Road intersects with San Marcos Boulevard and continues northward. There is a junction with State Route 78. A short distance north, Rancho Santa Fe ends at County Route S14 (which changes names from Santa Fe Avenue to Mission Road at the intersection). ;Major intersections ==S11==

County Route S11 (CR S11), known entirely as El Camino Real, is a county route in San Diego County, California, United States. It runs through the North County region in San Diego County, from Encinitas Boulevard (County Route S9) in Encinitas to State Route 78 in Oceanside. As its street name implies, it is part of the 600-mile (965-kilometer) commemorative route connecting the 21 Spanish missions in California (formerly Alta California). ;Route description CR S11's southern terminus is Encinitas Boulevard (CR S9) in Encinitas. It continues northward through Encinitas, intersecting with Lecuadia Boulevard/Olivenhain Road, which leads to CR S10 (Rancho Santa Fe Road) east of this intersection. After this point, it enters Carlsbad, where it intersects with Palomar Airport Road (CR S12). It continues northward through Carlsbad, ending at State Route 78 in Oceanside. Note that El Camino Real continues for several miles beyond both termini. It extends southward through Encinitas until it reaches San Elijo Lagoon and ends at Manchester Avenue. An unconnected road further east also called El Camino Real starts at the San Elijo Lagoon and continues south for several miles until Carmel Mountain Road. Northward in Oceanside, El Camino Real passes under State Route 76 and ends just north at Douglas Drive. ;Major intersections ==S12==

County Route S12 (CR S12), also known as Palomar Airport Road, San Marcos Boulevard, Twin Oaks Valley Road, and Deer Springs Road, is a county highway in San Diego County, California, United States. It runs through the North County region of San Diego County from Carlsbad Boulevard (County Route S21) in Carlsbad to Interstate 15 near Hidden Meadows. ;Route description CR S12's western terminus is at Carlsbad Boulevard (CR S21) in Carlsbad. Almost immediately after it begins, CR S12 (this portion of which is called Palomar Airport Road) intersects with Interstate 5. It passes Legoland California and continues eastward, passing its namesake, McClellan–Palomar Airport. It intersects with El Camino Real (CR S11) before running through a number of industrial and business parks. Eventually, CR S12 enters San Marcos, where it becomes San Marcos Boulevard after an intersection with Business Park Drive. San Marcos Boulevard intersects Rancho Santa Fe Road (CR S10) and continues eastward, crossing State Route 78. Shortly thereafter, San Marcos Boulevard intersects with Twin Oaks Valley Road, which assumes the S12 designation after this junction. Shortly after becoming CR S12, Twin Oaks Valley Road passes over Mission Road (CR S14) without actually intersecting it, then continues to the northern city limits of San Marcos. At the edge of the city, Twin Oaks Valley Road narrows into a private road, and CR S12 bears right to become Deer Springs Road, which continues northward through unincorporated land. Eventually the road turns east, and CR S12 ends at an interchange with Interstate 15, though the road itself continues as Mountain Meadow Road through Hidden Meadows. The route was established in 1961. ;Major intersections ==S13==

County Route S13 (CR S13), also known as Vista Village Drive, East Vista Way, and Mission Road, is a county highway in San Diego County, California, United States, that runs through the North County region of San Diego County. It is distinctive for having a three-mile (5 km) discontinuity in Bonsall. ;Route description CR S13's southern terminus is at State Route 78 in Vista, where the street is known as Vista Village Drive. This section of CR S13 is the northern boundary of the newly renovated downtown area of Vista, and in this area the road intersects with Santa Fe Avenue, which is CR S14. Shortly afterwards, the road's name changes to East Vista Way, and continues northward outside the city limits into the unincorporated community of Bonsall. CR S13 is unusual in that, according to official legislation, its route is discontinuous. In Bonsall, East Vista Way meets State Route 76 and, from this point, loses its status as CR S13. Nearly three miles northeast on SR 76, CR S13 begins again, continuing northward, but as South Mission Road. Mission Road cuts north through Bonsall and passes the neighborhoods of San Luis Rey Heights and Winterwarm before entering Fallbrook. In Fallbrook, South Mission Road splits off into South Main Avenue, which carries the S13 signage. These two streets run parallel to each other for several blocks; East Fallbrook Road (SR S15) begins at Mission and intersects Main. After a short distance, Mission turns east, intersecting Main; Mission then continues as S13. CR S13 continues eastward, ending at an interchange with Interstate 15. Almost all of S13, except for later realigned portions, is an old alignment of U.S. Route 395, and Historic Route signs are posted in unincorporated areas. The route was established in 1968. ;Major intersections ==S14==

County Route S14 (CR S14), also known as Santa Fe Avenue, Mission Road, and Mission Avenue, is a county highway in San Diego County, California, United States, that runs through the North County region of San Diego County. It runs from State Route 76 in Oceanside to Centre City Parkway in Escondido. ;Route description CR S14's western terminus is at State Route 76 in Oceanside, where it is known as North Santa Fe Avenue. It travels into Vista, becoming South Santa Fe Avenue before intersecting with County Route S13, or Vista Village Drive, in downtown Vista. At this point it begins to run parallel to State Route 78, which it does until its terminus. Santa Fe travels into western San Marcos, where it intersects with County Route S10 (Rancho Santa Fe Road); it is at this intersection that Santa Fe becomes Mission Road. Mission continues through San Marcos, passing under Twin Oaks Valley Road (County Route S12) without an intersection. In eastern San Marcos, Mission Road crosses State Route 78 without an interchange and becomes Mission Avenue. Shortly afterward, it enters Escondido, where it crosses Interstate 15, again with no interchange. Shortly after this point, the freeway portion of SR 78 ends and that route turns right onto Broadway, but CR S14's eastern terminus is at Centre City Parkway, a few blocks short from Broadway. CR S14 east of CR S13, except for later realigned portions, is an old alignment of U.S. Route 395, and Historic Route signs are posted in unincorporated areas. The route was established in 1968. ;Major intersections ==S15==

County Route S15 (CR S15) is a county highway in San Diego County, California, United States. It runs from County Route S13 (Mission Road) in Fallbrook to Old Highway 395. ;Route description CR S15's western terminus is at CR S13, also known as Mission Road, in Fallbrook. It begins as East Fallbrook Street. At the intersection with South Stage Coach Lane, CR S15 continues south to the intersection with Reche Road, at which point CR S15 again heads east. CR S15 continues east as Reche Road until it reaches its eastern terminus at the intersection with Old Highway 395, adjacent to Interstate 15. The route was established in 1959. ;Major intersections ==S16==

County Route S16 (CR S16), also known as Pala-Temecula Road, Pala Road, and Pechanga Parkway, is a county highway in San Diego and Riverside counties in California, United States. It runs from its south end at State Route 76 on the Pala Indian Reservation to its north end at State Route 79 (Temecula Parkway) in Temecula. ;Route description The route's southern terminus is at SR 76 on the Pala Indian Reservation, in the San Luis Rey River Valley, near the community of Pala. It twists through a short but rugged and steep mountain range and continues northward as Pala-Temecula Road through rural San Diego County. When it crosses the Riverside County line and enters the Pechanga Indian Reservation, it becomes Pala Road. Shortly thereafter, County Route S16 widens to four lanes as it reaches the city limits of Temecula, where it becomes Pechanga Parkway. Near the Pechanga Resort & Casino, Pechanga Parkway becomes a six-lane arterial road and continues along several large suburban neighborhoods before ending at a T intersection with SR 79 (Temecula Parkway). The portion of County Route S16 known as Pechanga Parkway, as well as the portion of SR 79 known as Temecula Parkway, are unsigned because the City of Temecula maintains jurisdiction over both segments. The route was established in 1959. ;Major intersections ==S17==

County Route S17 (CR S17) is a county highway in San Diego County, California, United States. It runs from Interstate 5 in Chula Vista to Interstate 8 in El Cajon. The route consists of portions of several roads passing through the cities of Chula Vista and El Cajon, and the unincorporated communities of Bonita, Spring Valley, and Rancho San Diego. County Route S17 roughly parallels State Route 54 from Interstate 5 east to State Route 125, running along E Street, Bonita Road, Sweetwater Road, South Worthington Street, and Paradise Valley Road. The route then shares the same alignment as State Route 54, from State Route 125 northeast to the El Cajon city limit, running along Jamacha Boulevard, Campo Road, and Jamacha Road. Within El Cajon, CR S17 shares the same alignment as the former State Route 54, continuing north to Interstate 8 along Jamacha Road and 2nd Street. The portions of County Route S17 within the cities of Chula Vista and El Cajon are no longer signed. The portions of the route within Bonita and Spring Valley are signed. However, all signs in Rancho San Diego (along Campo and Jamacha Roads) appear to have been removed except for the one heading east coming from the terminus of the freeway portion of State Route 94. In El Cajon city limits, the route is signed with Business Route 54. The route was established in 1964. ;Major intersections ==S18==

County Route S18 (CR S18) is a county highway in Orange County, California, United States. The route follows El Toro Road and Santiago Canyon Road which proceeds in a boomerang-like pattern from State Route 133 in Laguna Beach to State Route 55 near Orange. CR S18 traverses as a loop around the urban areas of Orange County and cuts through the Santa Ana Mountains. The road is one of four county routes in Orange County that are signed in areas nearby the route, such as southbound Interstate 5 and northbound State Route 133. It is also noted to be the longest county route in Orange County and is the only major route that allows motorists to drive through, in, and out of the Santa Ana Mountains. The Santiago Canyon Road portion of CR S18 in the Santa Ana Mountains is planned to become designated as an official scenic highway as part of the State Scenic Highway System. This makes it the second highway to become designated as a scenic road in Orange County, California, despite the impact from the Santiago Fire as part of the wildfires in October 2007. ;Major intersections ==S19==

County Route S19 (CR S19) is a county highway in the U.S. state of California in Orange County. The route follows Live Oak Canyon Road from O'Neill Park to El Toro Road (S18) to Trabuco Canyon. County Route S19 is notorious for many fatal accidents that have occurred in the recent years since 2000, and many lost lives due to such accidents. The route was established in 1961. ;Major intersections ==S20==

County Route S20 (CR S20) was a county highway in the U.S. state of California. As the only county route in Santa Barbara County at the time, it was merged with State Route 1 in 1988, rerouting SR 1 from Harris Grade Road to the former county route leading into Vandenberg Air Force Base. ==S21==