California's 40th congressional district is a congressional district in the U.S. state of California, encompassing Orange, San Bernardino, and Riverside counties. The district is currently represented by . It was one of 18 districts that would have voted for Joe Biden in the 2020 presidential election had they existed in their current configuration while being won or held by a Republican in 2022.

The district includes Yorba Linda, Anaheim Hills, Orange, Chino Hills, Tustin, Mission Viejo, Aliso Viejo, Rancho Santa Margarita, Laguna Hills, Laguna Woods, Villa Park, Lake Forest, the unincorporated communities of North Tustin and Coto de Caza, and parts of Brea and Corona.

Recent election results from statewide races Year Office Results2008 PresidentMcCain 56% - 44%2010 GovernorWhitman 63% - 32% Lt. GovernorMaldonado 53% - 33% Secretary of StateDunn 61% - 32% Attorney GeneralCooley 66% - 26% TreasurerWalters 58% - 35% ControllerStrickland 60% - 32%2012 PresidentRomney 58% - 39%2014 GovernorKashkari 62% - 38%2016 PresidentTrump 49% - 45%2018 GovernorCox 56% - 44% Attorney GeneralBailey 54% - 46%2020 PresidentBiden 50% - 48%2022 Senate (Reg.)Meuser 54% - 46% GovernorDahle 55% - 45% Lt. GovernorUnderwood Jacobs 55% - 45% Secretary of StateBernosky 55% - 45% Attorney GeneralHochman 56% - 44% TreasurerGuerrero 56% - 44% ControllerChen 59% - 41%2024 PresidentTrump 49% - 47% Senate (Reg.)Garvey 54% - 46%

Composition County Code County Seat Population 59 Orange Santa Ana 3,135,755 65 Riverside Riverside 2,492,442 71 San Bernardino San Bernardino 2,195,611 Under the 2020 redistricting, California's 40th congressional district is located in Southern California, taking up the majority of northern and eastern Orange County, and parts of southwestern San Bernardino and western Riverside Counties. The area in Orange County includes the cities of Tustin, Yorba Linda, Lake Forest, Laguna Woods, Laguna Hills, Mission Viejo, Rancho Santa Margarita, Brea, Villa Park, Aliso Viejo, eastern Orange, and eastern Anaheim; and the census-designated places North Tustin, Silverado, Williams Canyon, Modjeska, Trabuco Canyon and Coto de Caza. The area in San Bernardino County includes most of the city of Chino Hills.

Orange County is split between this district, the 38th district, the 45th district, the 46th district, the 47th district, and the 49th district. The 40th and 45th are partitioned by Orange Freeway, E Lambert Rd, Sunrise Rd, Foothill Ln, Wandering Ln, N Associated Rd, E Birch St, S Valencia Ave, La Plaza Dr, La Floresta Dr, La Crescenta Dr, Highway 90, 1053 E Imperial Highway-343 Tolbert St, Vesuvius Dr, Rose Dr, Wabash Ave, 6th St, Golden Ave, Carbon Canyon Creek, E Yorba Linda Blvd, Jefferson St, 1401 Zion Ave-N Van Buren St, Buena Vista Ave, 17225 Orange Blossom Ln-1480 E Howard Pl, 17511 Pine Cir-Orchard Dr, Mariposa Ave, Lakeview Ave, E Miraloma Ave, Fee-Ana St, Sierra Madre Cir, E Orangethorpe Ave, Burlington Northern Santa Fe Railroad, Kensington Ave, N Kraemer Blvd, Carbon Creek, and E La Jolla St.

The 40th and 46th are partitioned by E La Palma Ave, E Jackson Ave, E Frontera St, Santa Ana River, Riverside Freeway, Costa Mesa Freeway, N Tustin St, E Meats Ave, N Orange Olive Rd, Garden Grove Freeway, 16909 Donwest-16791 E Main St, E Chestnut Ave, 16282 E Main St-717 S Lyon St, E McFadden Ave, and Warner Ave.

The 40th, 47th, and 49th are partitioned by Barranca Parkway, Jamboree Rd, Warner Ave, Harvard Ave, Myford Rd, Highway 5, Loma Ridge Nature Preserve, Bee Canyon Access Rd, Portola Parkway, Highway 133, Highway 241, Bake Parkway, San Diego Freeway, Ridge Route Dr, Moulton Parkway, Santa Maria Ave, Via Vista, Alta Vis, Santa Vittoria Dr, Avenida del Sol, Punta Alta, Galle Azul, Bahia Blanca W, Laguna Coast Wilderness Park, Highway S18, Aliso & Wood Canyons, Alicia Parkway, Pacific Park Dr, San Joaquin Hills Trans Corridor, Cabot Rd, San Diego Freeway, Via Escolar, Arroyo Trabuco Creek, Oso Parkway, Thomas F Riley Wilderness Park, and Ronald W Casper's Wilderness Park.

San Bernardino County is split between this district and the 35th district. They are partitioned by Chino Valley Freeway, Eucalyptus Ave, Peyton Dr, Highway 142, Tupelo Ave, Hazelwood Dr, Pipeline Ave, Los Serranos Blvd, Country Club Dr, Soquel Canyon Parkway, Elinvar Dr, Sapphire Rd, Onyx Rd, Copper Rd, Slate Dr, Butterfield Ranch Rd, and Pine Ave.

Cities and CDPs with 10,000 or more people Anaheim – 346,824 Orange – 139,911 Mission Viejo – 93,653 Lake Forest – 85,858 Tustin – 80,276 Chino Hills – 78,411 Yorba Linda – 68,336 Aliso Viejo – 52,176 Rancho Santa Margarita – 47,949 Brea – 47,325 Laguna Hills – 31,374 North Tustin – 25,718 Laguna Woods – 17,192 Coto de Caza – 14,710

2,500 – 10,000 people

Villa Park – 5,843

Future composition Beginning with the 2026 election, the 40th district will consist of the following counties:  

Orange (part) Riverside (part)

List of members representing the district Member Party Dates Congress(es) Electoral history Counties District created January 3, 1973 Bob Wilson Republican January 3, 1973 –January 3, 1975 Redistricted from the and re-elected in 1972.Redistricted to the . 1973–1975San Diego (San Diego City Northern half) Andrew J. Hinshaw Republican January 3, 1975 –January 3, 1977 Redistricted from the and re-elected in 1974.Lost renomination.1975–1983Southern Orange, Northwestern San Diego Robert Badham Republican January 3, 1977 –January 3, 1989 Elected in 1976.Re-elected in 1978.Re-elected in 1980.Re-elected in 1982.Re-elected in 1984.Re-elected in 1986.Retired.1983–1993Central Orange Christopher Cox Republican January 3, 1989 –January 3, 1993 Elected in 1988.Re-elected in 1990.Redistricted to the . Jerry Lewis Republican January 3, 1993 –January 3, 2003 Redistricted from the and re-elected in 1992.Re-elected in 1994.Re-elected in 1996.Re-elected in 1998.Re-elected in 2000.Redistricted to the . 1993–2003Inyo, San Bernardino Ed Royce Republican January 3, 2003 –January 3, 2013 Redistricted from the and re-elected in 2002.Re-elected in 2004.Re-elected in 2006.Re-elected in 2008.Re-elected in 2010.Redistricted to the . 2003–2013Northern Orange Lucille Roybal-Allard Democratic January 3, 2013 –January 3, 2023 Redistricted from the and re-elected in 2012.Re-elected in 2014.Re-elected in 2016.Re-elected in 2018.Re-elected in 2020.Redistricted to the and retired. 2013–2023Los Angeles (Downey and East Los Angeles) Young Kim Republican January 3, 2023 –present Redistricted from the and re-elected in 2022.Re-elected in 2024. 2023–present:Parts of Orange, Riverside and San Bernardino counties(Yorba Linda, Anaheim Hills, Orange, Chino Hills, Tustin, Mission Viejo, Aliso Viejo, Rancho Santa Margarita, Laguna Hills, Laguna Woods, Villa Park, Lake Forest, the unincorporated communities of North Tustin and Coto de Caza, and parts of Brea and Corona.)

Election results 1972 • 1974 • 1976 • 1978 • 1980 • 1982 • 1984 • 1986 • 1988 • 1990 • 1992 • 1994 • 1996 • 1998 • 2000 • 2002 • 2004 • 2006 • 2008 • 2010 • 2012 • 2014 • 2016 • 2018 • 2020 • 2022 • 2024

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Historical district boundaries The seat was originally one of five reapportioned to California after the 1970 U.S. census, but its boundaries have shifted radically through successive redistricting efforts. At various times it has included parts of Orange and San Diego counties, and from 1993 to 2003 it covered eastern San Bernardino and Inyo counties. From 2003 to 2013 the district was based in Orange County. The district covered the cities in the northern part of the county, including Fullerton, Orange, Cypress, Stanton, and Buena Park.

See also List of United States congressional districts California's congressional districts

References

External links GovTrack.us: California's 40th congressional district RAND California Election Returns: District Definitions California Voter Foundation map – CD40