California's 31st congressional district is a congressional district in Los Angeles County, in the U.S. state of California. The district is located in the San Gabriel Valley and contains most of the Hispanic-majority areas in that region.

From January 3, 2023, following the 2020 redistricting cycle, the district is currently represented by Democrat Gil Cisneros.

Recent election results from statewide races 2023–2027 boundaries Year Office Results2008 PresidentObama 63% - 36%2010 GovernorBrown 57% - 37% Lt. GovernorNewsom 51% - 36% Secretary of StateBowen 56% - 35% Attorney GeneralHarris 47% - 45% TreasurerLockyer 60% - 32% ControllerChiang 56% - 34%2012 PresidentObama 66% - 34%2014 GovernorBrown 59% - 41%2016 PresidentClinton 66% - 29%2018 GovernorNewsom 64% - 36% Attorney GeneralBecerra 67% - 33%2020 PresidentBiden 64% - 33%2022 Senate (Reg.)Padilla 61% - 39% GovernorNewsom 58% - 42% Lt. GovernorKounalakis 59% - 41% Secretary of StateWeber 59% - 41% Attorney GeneralBonta 58% - 42% TreasurerMa 58% - 42% ControllerCohen 56% - 44%2024 PresidentHarris 57% - 40% Senate (Reg.)Schiff 57% - 43%

Composition County Code County Seat Population 37 Los Angeles Los Angeles 9,663,345

Under the 2020 redistricting, California's 31st congressional district is located in Southern California, taking up part of eastern Los Angeles County. It includes the cities of El Monte, West Covina, Baldwin Park, Azusa, San Dimas, La Verne, Duarte, South El Monte, Industry, La Puente, Bradbury, Irwindale, and Covina; the south sides of the cities of Glendora and Monrovia; and the census-designated places Avocado Heights, North El Monte, South San Jose Hills, West Puente Valley, Valinda, Mayflower Village, South Monrovia Island, Vincent, Citrus, and Charter Oak.

Los Angeles County is split between this district, the 28th district, the 34th district, and the 38th district. The 31st and the 28th are partitioned by Rio Hondo River, Garvey Ave, Highway 19, Highway 10, Eaton Wash, Temple City Blvd, Valley Blvd, Ellis Ln, Lower Azusa Rd, Grande Ave, Santa Anita Ave, Lynrose St, Flood Control Basin, Peck Rd, Randolph St, Cogswell Rd, Clark St, Durfree Ave, Santa Anita Wash, S 10th Ave, Jeffries Ave, Mayflower/Fairgreen Ave, Alta Vista/Fairgreen Ave, El Norte Ave, S 5th Ave, Valencia Way/N 5th Ave, Hillcrest Blvd, E Hillcrest Blvd, Grand Ave, E Greystone Ave, N Bradoaks Ave, Angeles National Forest, W Fork Rd, Highway 39, Cedar Creek, Iron Fork, Glendora Mountain Rd, Morris Reservoir, W Sierra Madre Ave, N Lorraine Ave, E Foothill Blvd, E Carroll Ave, Steffen St, S Lorraine Ave, AT and SF Railway, E Route 66, N Cataract Ave, San Dimas Canyon Rd, Clayton Ct, Live Oak Canyon, Rotary Dr, Highway 30, Williams Ave, Highway 210, Garey Ave, and Summer Ave.

The 31st, 35th, and 38th are partitioned by Whittier Narrows Recreation Area, N Lexington-Gallatin Rd, N Durfree Ave, E Thienes Ave, E Rush St, N Burkett Rd, Cunningham Dr, Eaglemont Dr, Oakman Dr, Arciero Dr, Grossmont Dr, Workman Mill Rd, Bunbury Dr, Fontenoy Ave, Ankerton, Whittier Woods Circle, Union Pacific Railroad, San Gabriel Freeway, N Peck Rd, Mission Mill Rd, Rose Hills Rd, Wildwood Dr, Clark Ave, San Jose Creek, Turnbull Canyon Rd, E Gale Ave, Pomona Freeway, Colima Rd, E Walnut Dr N, Nogales St, E Walnut Dr S, Fairway Dr, E Valley Blvd, Calle Baja, La Puente Rd, S Sentous Ave, N Nogales St, Amar Rd, Walnut City Parkland, San Bernardino Freeway, Fairplex Dr, Via Verde, Puddingstone Reservoir, McKinley Ave, N Whittle Ave, Arrow Highway, Fulton Rd, and Foothill Blvd.

Cities and CDPs with 10,000 or more people West Covina – 109,501 El Monte – 109,450 Baldwin Park – 72,176 Glendora – 52,558 Covina – 51,268 Azusa – 50,000 La Puente – 38,062 Monrovia – 37,931 San Dimas – 34,064 La Verne – 31,334 West Puente Valley – 22,959 Valinda – 22,437 Duarte – 21,727 South San Jose Hills – 19,855 South El Monte – 19,567 Vincent – 15,714 Avocado Heights – 13,317 Citrus – 10,243

2,500 to 10,000 people

Charter Oak – 9,739 South Monrovia Island – 6,515 Mayflower Village – 5,402 North El Monte – 3,730

Future composition

Los Angeles (part) San Bernardino (part)

List of members representing the district Member Party Dates Congress(es) Electoral history Counties District created January 3, 1963 Charles H. WilsonDemocratic January 3, 1963 –January 3, 1981 Elected in 1962. Re-elected in 1964.Re-elected in 1966.Re-elected in 1968.Re-elected in 1970.Re-elected in 1972.Re-elected in 1974.Re-elected in 1976.Re-elected in 1978.Lost re-nomination. 1963–1969Los Angeles 1969–1973Los Angeles 1973–1975Los Angeles1975–1983Los Angeles Mervyn DymallyDemocratic January 3, 1981 –January 3, 1993 Elected in 1980.Re-elected in 1982.Re-elected in 1984.Re-elected in 1986.Re-elected in 1988.Re-elected in 1990.Retired. 1983–1993Los Angeles (Carson, Compton) Matthew G. MartínezDemocratic January 3, 1993 –July 27, 2000 Redistricted from the and re-elected in 1992.Re-elected in 1994.Re-elected in 1996.Re-elected in 1998.Lost re-nomination.1993–2003Los Angeles (Baldwin Park, East L.A.)Republican July 27, 2000 –January 3, 2001 Switched to Republican Party after losing re-nomination. Hilda SolisDemocratic January 3, 2001 –January 3, 2003 Elected in 2000.Redistricted to the . Xavier BecerraDemocratic 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 . 2003–2013Los Angeles (Hollywood, Northeast L.A.) Gary MillerRepublican January 3, 2013 –January 3, 2015 Redistricted from the and re-elected in 2012.Retired.2013–2023Inland Empire including San Bernardino and Rancho Cucamonga Pete AguilarDemocratic January 3, 2015 –January 3, 2023 Elected in 2014.Re-elected in 2016.Re-elected in 2018.Re-elected in 2020.Redistricted to the . Grace Napolitano Democratic January 3, 2023 –January 3, 2025 Redistricted from the and re-elected in 2022. Retired. 2023–presentArcadia, El Monte, Baldwin Park, Duarte, West Covina, Covina, Azusa, southern Glendora, and most of Ramona in eastern Los Angeles CountyGil Cisneros DemocraticJanuary 3, 2025presentElected in 2024.

Election results 1962 • 1964 • 1966 • 1968 • 1970 • 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

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Historical district boundaries Formerly, from 2003 to 2013, the district was the only congressional district entirely based within the City of Los Angeles, and included Hollywood and some predominantly Hispanic/Latino sections of central and northeast Los Angeles.

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

References

External links GovTrack.us: California's 31st congressional district RAND California Election Returns: District Definitions California Voter Foundation map - CD31