CA-04 elected a Republican in 2018.

R+8.3 on 340,654 certified votes. Below: the 2018 result and this district's margin across every cycle on record.

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CA-04 — 2018 result

Source: MIT Election Data + Science Lab, US House returns (party-classified by literal ballot party).

Democratic (D)

156,253

45.9%

Republican (R)

184,401

54.1%

All others

0

0.0%

Margin

R+8.3

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Margin history

CA-04 across every cycle on record. Each year links to its district page.

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Year	Won	Margin	Votes
2024	D	+32.9%	342,680
2022	D	+35.6%	260,907
2020	R	−11.9%	442,022
2018	R	−8.3%	340,654
2016	R	−25.4%	350,978
2014	R	−100.0%	211,134
2012	R	−22.2%	323,688
2010	R	−29.8%	304,229
2008	R	−0.5%	369,780
2006	R	−3.2%	276,893
2004	R	−30.8%	339,369
2002	R	−32.9%	228,506
2000	R	−32.0%	311,423
1998	R	−28.2%	248,224
1996	R	−24.4%	271,315
1994	R	−26.4%	236,323
1992	R	−4.1%	283,365
1990	D	+15.4%	210,454
1988	D	+99.3%	182,490
1986	D	+40.3%	182,960
1984	D	+24.7%	211,921
1982	D	+27.7%	185,523
1980	D	+35.6%	205,055
1978	D	+10.7%	158,497
1976	D	+0.4%	151,037