California's 45th congressional district
Interactive map of district boundaries since January 3, 2023
Representative	Derek Tran D–Orange
Population (2024)	741,928
Median household income	$105,531[1]
Ethnicity	38.4%Asian 30.0%Hispanic 25.2%White 3.3%Two or more races 2.1%Black 0.9% other
Cook PVI	D+1[2]

California's 45th congressional district is acongressional district in theU.S. state ofCalifornia currently represented by DemocratDerek Tran.

The 45th district was created as a result of theredistricting cycle after the1980 census.

The district is based inOrange andLos Angeles counties and includes all ofGarden Grove,Westminster,Cerritos,Buena Park,Placentia,Hawaiian Gardens,Cypress,Fountain Valley,Artesia,Los Alamitos,Rossmoor, andLa Palma, as well as parts ofBrea,Lakewood, andFullerton.

In 2018, incumbent Representative Mimi Walters competed against a field of four Democrats and an independent candidate in the primary election for the2018 midterm elections. On February 25, 2018,UC Irvine (UCI) assistant law professorDave Min received the endorsement of theCalifornia Democratic Party.^[3]

Min, former White House senior technology advisorBrian Forde,^[4] former legislative assistant toSherrod Brown (D-OH) Kia Hamadanchy,^[5] UCI law professorKatie Porter,^[6] and UCI business professor John Graham ran in the "top two" primary in June 2018. Walters and Porter placed first and second and advanced to the general election in November.

On November 14, 2018, eight days after polls closed,Dave Wasserman, then the House Editor forThe Cook Political Report, projected that Porter had won the general election.^[7]

In 2024, theelection in this district was one of the state's most competitive. In its current form after the 2020 redistricting, the district has a significant presence ofAsian-American voters.^[8]

Under the 2020 redistricting, California's 45th congressional district is located inSouthern California, taking up westernOrange County and eastLos Angeles County. The area in Orange County includes the cities ofCypress,Brea,Placentia,Westminster,Garden Grove,Buena Park,Fountain Valley,Los Alamitos,La Palma, and northernFullerton, part ofYorba Linda; and the census-designated placesRossmoor andMidway City. The area in Los Angeles County includes the cities ofCerritos,Artesia,Hawaiian Gardens, and part ofLakewood.

Orange County is split between this district, the40th district, the46th district, and the47th district. The 45th and 40th 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 45th and 46th are partitioned by Santa Ana River, W Lehnhardt Ave, Gloxinia Ave, Lilac Way, Edinger Ave, Pebble Ct, 10744 W Lehnhardt Ave-10726 Kedge Ave, 724 S Sail St-5641 W Barbette Ave-407 S Starboard St, Starboard St/S Cooper St, Taft St, Hazard Ave, N Euclid St, Westminster Ave, Clinton St, 14300 Clinton St-1001 Mar Les Dr, Mar Les Dr, 2729 Huckleberry Rd, N Fairview St, Fairview St, 13462 Garden Grove Blvd-13252 Marty Ln, Townley St/Siemon Ave, W Garden Grove Blvd, S Lewis St, W Chapman Ave, E Simmons Ave, S Haster St, Ascot Dr, W Orangewood Ave, S 9th St, 2209 S Waverly Dr-11751 S Waverly Dr, Euclid St, Haven Ln, W Dudley Ave, S Euclid St, Katella Ave, Dale St, Rancho Alamitos High School, Orangewood Ave, Barber City Channel, Arrowhead St, Del Rey Dr, Westcliff Dr, Lampson Ave, Fern St, Garden Glove Blvd, Union Pacific Railroad, 7772 W Chapman Ave-Bently Ave, Highway 39, Western Ave, Stanton Storm Channel, Knott Ave, 6970 Via Kannela-6555 Katella Ave, Cerritos Ave, 10490 Carlotta Ave-Ball Rd, John Beat Park, S Knott Ave, Solano Dr, Monterra Way, Campesina Dr, Holder Elementary School, W Orange Ave, 6698 Via Riverside Way-Orangeview Junior High School, W Lincoln Ave, 195 N Western Ave-298 N Western Ave, 3181 W Coolidge Ave-405 N Dale St, W Crescent Ave, N La Reina St, W La Palma Ave, Boisseranc Park, I-5 HOV Lane, Orangethorpe Ave, Fullerton Creek, Whitaker St, Commonwealth Ave, Los Angeles County Metro, W Malvern Ave, W Chapman Ave, E Chapman Ave, S Placentia Ave, Kimberly Ave, E Orangethorpe Ave, and 2500 E Terrace St-Highway 57.

The 45th and 47th are partitioned by Highway 405, Old Ranch Parkway, Seal Beach Blvd, St Cloud Dr, Montecito Rd, Rossmoor Center Way, 12240 Seal Beach Blvd-Los Alamitos Army Airfield, Bolsa Chica Channel, Rancho Rd, Harold Pl, Springdale St, 6021 Anacapa Dr-Willow Ln, Edward St, Bolsa Ave, Goldenwest St, McFadden Ave, Union Pacific Railroad, 15241 Cascade Ln-15241 Cedarwood Ave, Highway 39, Edinger Ave, Newland St, Heil Ave, Magnolia St, Warner Ave, Garfield Ave, and the Santa Ana River.

Los Angeles County is split between this district, the38th district, and the42nd district. The 45th and 42nd are partitioned by San Gabriel River, Palo Verde Ave, South St, Del Amo Blvd, Pioneer Blvd, Coyote Creek, Centralia Creek, Hawaiian Ave, Verne Ave, Bloomfield Park, Highway 605, 226th St, Dorado Cir, Cortner Ave, E Woodson St, Bloomfield Ave, Lilly Ave, Marna Ave, and Los Alamos Channel.

The 45th and 38th are partitioned by Valley View Ave, Southern Pacific Railroad, Alondra Blvd, 15917 Canyon Creek Rd-12371 Hermosura St, Norwalk Blvd, 166th St, and Cerritos College Child Development-Alondra Blvd.

• Garden Grove – 171,949
• Fullerton – 143,617
• Westminster – 90,911
• Buena Park – 84,034
• Lakewood – 82,496
• Yorba Linda – 68,336
• Fountain Valley – 57,047
• Placentia – 51,824
• Cypress – 50,151
• Cerritos – 49,578
• Brea – 47,325
• Artesia – 16,395
• La Palma – 15,581
• Hawaiian Gardens – 13,593
• Los Alamitos – 11,780
• Rossmoor – 10,625

• Midway City – 8,825

Member	Party	Dates	Cong ress(es)	Electoral history	Counties
District created January 3, 1983
Duncan Hunter (Coronado)[14]	Republican	January 3, 1983 – January 3, 1993	98th 99th 100th 101st 102nd	Redistricted from the42nd district andre-elected in 1982. Re-elected in 1984. Re-elected in 1986. Re-elected in 1988. Re-elected in 1990. Redistricted to the52nd district.	1983–1993 Imperial,San Diego
Dana Rohrabacher (Huntington Beach)[14]	Republican	January 3, 1993 – January 3, 2003	103rd 104th 105th 106th 107th	Redistricted from the42nd district andre-elected in 1992. Re-elected in 1994. Re-elected in 1996. Re-elected in 1998. Re-elected in 2000. Redistricted to the46th district.	1993–2003 Orange
Mary Bono (Palm Springs)[14]	Republican	January 3, 2003 – January 3, 2013	108th 109th 110th 111th 112th	Redistricted from the44th district andre-elected in 2002. Re-elected in 2004. Re-elected in 2006. Re-elected in 2008. Re-elected in 2010. Redistricted to the36th district and lost re-election.	2003–2013 Riverside
John Campbell (Irvine)[15]	Republican	January 3, 2013 – January 3, 2015	113th	Redistricted from the48th district andre-elected in 2012. Retired.	2013–2023 Orange
Mimi Walters (Irvine)[16]	Republican	January 3, 2015 – January 3, 2019	114th 115th	Elected in 2014. Re-elected in 2016. Lost re-election.
Katie Porter (Irvine)[17]	Democratic	January 3, 2019 – January 3, 2023	116th 117th	Elected in 2018. Re-elected in 2020. Redistricted to the47th district.
Michelle Steel (Seal Beach)[18]	Republican	January 3, 2023 – January 3, 2025	118th	Redistricted from the48th district andre-elected in 2022. Lost re-election.	2023–present: Orange,Los Angeles
Derek Tran (Orange)	Democratic	January 3, 2025– present	119th	Elected in 2024.

From 2003 to 2013, this district was based inRiverside County. The district included the communities ofPalm Springs,Moreno Valley,Palm Desert,Hemet,Cathedral City,Temecula,Blythe,Rancho Mirage,Murrieta,Indio,Indian Wells,La Quinta,Cabazon,Anza,Thermal,Idyllwild,Coachella, and other unincorporated areas ofRiverside County.

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

• GovTrack.us:California's 45th congressional district
• RAND California Election Returns: District Definitions
• California Voter Foundation map - CD45

33°42′51″N117°40′06″W / 33.71417°N 117.66833°W /33.71417; -117.66833

• Congressional districts of California
• Government of Orange County, California
• Anaheim, California
• Irvine, California
• Laguna Hills, California
• Lake Forest, California
• Mission Viejo, California
• Orange, California
• Tustin, California
• Constituencies established in 1983
• 1983 establishments in California

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