Question: California State Route 242 ends in which largest city of Contra Costa county?

full_context: Document 1: Interstate 580 (California): Interstate 580 (I-580) is an 80-mile (129 km) east–west Interstate Highway in Northern California. The heavily traveled spur route of Interstate 80 runs from San Rafael in the San Francisco Bay Area to Interstate 5 near Tracy in the Central Valley. It provides a connection from the Bay Area to the southern San Joaquin Valley and Southern California via Interstate 5, as Interstate 5 bypasses the Bay Area to the east.
Document 2: California State Route 299: State Route 299 (SR 299) is a state highway in the state of California that runs across the northern part of the state. At 305.777 mi , it is the third longest California state highway (after Route 1 and Route 99). Route 299 begins at US 101 at the northern edge of Arcata and continues in an easterly direction through to the Nevada state line. Between Arcata and Redding, Route 299 intersects with State Route 96, and is briefly co-signed with State Route 3. In Redding, it intersects with State Route 273, State Route 44, and Interstate 5. East of Redding, it intersects with State Route 89, and a section is co-signed with State Route 139 before reaching Alturas. It is then co-signed with U.S. Route 395 northeast of Alturas, and then runs east toward the border with Nevada. A ghost town, Vya, Nevada, can be reached via this route, which after the border becomes a dirt road, which was formerly Nevada State Route 8A.
Document 3: County Connection: The County Connection (officially, the Central Contra Costa Transit Authority, CCCTA) is a Concord-based public transit agency operating fixed-route bus and ADA paratransit (County Connection LINK) service in and around central Contra Costa County in the San Francisco Bay Area. Established in 1980 as a joint powers authority, CCCTA assumed control of public bus service within central Contra Costa first begun by Oakland-based AC Transit as it expanded into suburban Contra Costa County in the mid-1970s (especially after the opening of BART).
Document 4: Concord, California: Concord ( ) is the largest city in Contra Costa County, California. At the 2010 census, the city had a population of 122,067 making it the 8th largest city in the San Francisco Bay Area. Founded in 1869 as the community of Todos Santos by Salvio Pacheco, the name was changed to Concord within months. The city is a major regional suburban East Bay center within the San Francisco Bay Area, and is 29 mi east of San Francisco.
Document 5: San Ramon, California: San Ramon is a city in Contra Costa County, California, United States, located 15 miles east of San Francisco, and within the San Ramon Valley. San Ramon's population was estimated as 76,134 in mid-2015 by the US Census Bureau, making it the 4th largest city in Contra Costa County, behind Richmond, Concord and Antioch.
Document 6: Bay Point, California: Bay Point, formerly West Pittsburg, is a census-designated place located in the East Bay region of the San Francisco Bay Area in Contra Costa County, California. Bay Point is just west of Pittsburg, California, and northeast of Concord, California, on the southern shore of Suisun Bay. The population of Bay Point was 21,349 as of 2010. The Pittsburg-Bay Point terminal of the Bay Area Rapid Transit (BART) rail system is located adjacent to Bay Point in Pittsburg. The community is traversed by a freeway, State Route 4, the California Delta Highway. Being unincorporated, Bay Point does not have its own police department. The community is policed by the California Highway Patrol and the Contra Costa County Sheriff's Office. The ZIP code is 94565, and the area code is 925.
Document 7: Interstate 380 (California): Interstate 380 (I-380) is a short 1.7-mile (2.7 km) east–west spur Interstate Highway in the San Francisco Bay Area of Northern California, connecting Interstate 280 in San Bruno to U.S. Route 101 near the San Francisco International Airport (SFO). The highway primarily consists of only three intersections: I-280, El Camino Real (State Route 82), and U.S. 101. Like nearby I-280, I-380 never connects to Interstate 80, its parent Interstate Highway. However, there is no rule that says that spur routes need to. (Similarly, the spur route Interstate 795 branches off from Interstate 695, a beltway around Baltimore, and is only indirectly linked to Interstate 95.)
Document 8: El Cerrito, California: El Cerrito is a city in Contra Costa County, California, United States, and forms part of the San Francisco Bay Area. It has a population of 23,549 according to the 2010 census. El Cerrito was founded by refugees from the 1906 San Francisco earthquake. It was incorporated in 1917 as a village with 1500 residents. As of the census in 2000, there were 23,171 people, 10,208 households and 5971 families in the city. The top 20 employers in the city, according to the 2013 Comprehensive Annual Financial Report, include such entities as the West Contra Costa Unified School District, City of El Cerrito, Lucky Stores, Pastime ACE Hardware, and Honda of El Cerrito.
Document 9: Contra Costa Centre, California: Contra Costa Centre is a census-designated place in Contra Costa County, California. Contra Costa Centre sits at an elevation of 92 feet (28 m). The 2010 United States census reported Contra Costa Centre's population was 5,364. Contra Costa Centre is served by the Pleasant Hill / Contra Costa Centre BART station.
Document 10: Route of California High-Speed Rail: The California High-Speed Rail system will be built in two phases. Phase 1 will be about 520 miles long, and is planned to be completed in 2029, connecting the downtowns of San Francisco, Los Angeles, and Anaheim using high-speed rail through the Central Valley. In Phase 2, the route will be extended in the Central Valley north to Sacramento, and from Los Angeles east through the Inland Empire and then south to San Diego. The total system length will be about 800 miles long. Phase 2 has no dates as yet.
Document 11: Pleasant Hill, California: Pleasant Hill is a city in Contra Costa County, California, United States, in the East Bay of the San Francisco Bay Area. The population was 33,152 at the 2010 census. It was incorporated in 1961. Pleasant Hill is the home of College Park High School, Diablo Valley College, John F Kennedy University, the Pleasant Hill Library and administration offices for the Contra Costa County Library system, and the Pleasant Hill Recreation & Park District.
Document 12: Contra Costa Water District: The Contra Costa Water District (CCWD) is an agency that was created in 1936 to supply water for consumers in eastern Contra Costa, California. It is now one of the largest water districts in California, serving about 500,000 people in Central and Eastern Contra Costa County.
Document 13: California State Route 266: State Route 266 (SR 266) is a state highway in the U.S. state of California. The route traverses Fish Lake Valley, which is part in California and part in Nevada. The route connects two Nevada state routes that traverse the Nevada portion of the valley, NV 264 and NV 266. The only connection from SR 266 to the rest of California's road network is via SR 168. Prior to 1986 the southern and northern halves of modern SR 266 had separate numerical designations. The southern portion of the highway, along with modern SR 168, dates to the auto trail era, forming part of the Midland Trail.
Document 14: California State Route 242: State Route 242 (SR 242) is a short three-mile (5 km) connector route that links Interstate 680 north of Pleasant Hill to State Route 4 in Concord. In 2000, State Route 242 was widened to six through-traffic lanes for the entire route. Ramp metering is present at all onramps, and is used southbound in the morning and northbound in the evening. It was signed as part of State Route 24 until ca. 1987. Currently, along with Interstate 580, State Route 24, Interstate 680, and State Route 4, it serves as the most direct route between the San Francisco Bay Area and the Sacramento River Delta region of Northern California.
Document 15: Capital SouthEast Connector: The Capital SouthEast Connector is a 34 mi planned parkway in California running from Interstate 5 (I-5) to U.S. Route 50 (US 50). The route runs through Sacramento County, Elk Grove, Rancho Cordova, Folsom, and El Dorado County. This project serves as an alternative route to the Greater Sacramento region's current highway system. It consists of four to six lanes of thoroughfare and expressway; the connector phase I is projected to be completed around 2022–25, phase II around 2030–40.
ground_truth: Concord