California's 31st congressional district
Interactive map of district boundaries since January 3, 2023
Representative	Gil Cisneros D–Covina
Population (2024)	724,696
Median household income	$90,291[1]
Ethnicity	60.6%Hispanic 19.6%Asian 15.0%White 2.3%Black 1.8%Two or more races 0.7% other
Cook PVI	D+10[2]

California's 31st congressional district is acongressional district inLos Angeles County, in theU.S. state ofCalifornia. The district is located in theSan Gabriel Valley and contains most of the Hispanic-majority areas in that region.

From January 3, 2023, following the2020 redistricting cycle, the district is currently represented by DemocratGil Cisneros.

Under the 2020 redistricting, California's 31st congressional district is located inSouthern California, taking up part of easternLos Angeles County. It includes the cities ofEl Monte,West Covina,Baldwin Park,Azusa,San Dimas,La Verne,Duarte,South El Monte,Industry,La Puente,Bradbury,Irwindale, andCovina; the south sides of the cities ofGlendora andMonrovia; and the census-designated placesAvocado Heights,North El Monte,South San Jose Hills,West Puente Valley,Valinda,Mayflower Village,South Monrovia Island,Vincent,Citrus, andCharter Oak.

Los Angeles County is split between this district, the28th district, the34th district, and the38th 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.

• 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

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

Member	Party	Dates	Cong ress(es)	Electoral history	Counties
District created January 3, 1963
Charles H. Wilson (Hawthorne)	Democratic	January 3, 1963 – January 3, 1981	88th 89th 90th 91st 92nd 93rd 94th 95th 96th	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.	1963–1969 Los Angeles
					1969–1973 Los Angeles
					1973–1975 Los Angeles
					1975–1983 Los Angeles
Mervyn M. Dymally (Compton)	Democratic	January 3, 1981 – January 3, 1993	97th 98th 99th 100th 101st 102nd	Elected in 1980. Re-elected in 1982. Re-elected in 1984. Re-elected in 1986. Re-elected in 1988. Re-elected in 1990. Retired.
					1983–1993 Los Angeles (Carson,Compton)
Matthew G. Martínez (Monterey Park)	Democratic	January 3, 1993 – July 27, 2000	103rd 104th 105th 106th	Redistricted from the30th district andre-elected in 1992. Re-elected in 1994. Re-elected in 1996. Re-elected in 1998. Lost re-nomination.	1993–2003 Los Angeles (Baldwin Park,East L.A.)
	Republican	July 27, 2000 – January 3, 2001	106th	Switched to Republican Party after losing re-nomination.
Hilda Solis (El Monte)	Democratic	January 3, 2001 – January 3, 2003	107th	Elected in 2000. Redistricted to the32nd district.
Xavier Becerra (Los Angeles)	Democratic	January 3, 2003 – January 3, 2013	108th 109th 110th 111th 112th	Redistricted from the30th district andre-elected in 2002. Re-elected in 2004. Re-elected in 2006. Re-elected in 2008. Re-elected in 2010. Redistricted to the34th district.	2003–2013 Los Angeles (Hollywood,Northeast L.A.)
Gary Miller (Rancho Cucamonga)	Republican	January 3, 2013 – January 3, 2015	113th	Redistricted from the42nd district andre-elected in 2012. Retired.	2013–2023 Inland Empire includingSan Bernardino andRancho Cucamonga
Pete Aguilar (Redlands)	Democratic	January 3, 2015 – January 3, 2023	114th 115th 116th 117th	Elected in 2014. Re-elected in 2016. Re-elected in 2018. Re-elected in 2020. Redistricted to the33rd district.
Grace Napolitano (Norwalk)	Democratic	January 3, 2023 – January 3, 2025	118th	Redistricted from the32nd district andre-elected in 2022. Retired.	2023–present Arcadia,El Monte,Baldwin Park,Duarte,West Covina,Covina,Azusa, southernGlendora, and most ofRamona in easternLos Angeles County
Gil Cisneros (Covina)	Democratic	January 3, 2025 present	119th	Elected in 2024.

Formerly, from 2003 to 2013, the district was the only congressional district entirely based within theCity of Los Angeles, and includedHollywood and some predominantlyHispanic/Latino sections of central and northeast Los Angeles.

• List of United States congressional districts
• California's congressional districts

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

34°06′36″N117°21′12″W / 34.11000°N 117.35333°W /34.11000; -117.35333

• Congressional districts of California
• Government of San Bernardino County, California
• Inland Empire
• Rancho Cucamonga, California
• San Bernardino, California
• Colton, California
• Constituencies established in 1963
• 1963 establishments in California

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