CA-21 elected a Democrat in 2018.

D+0.8 on 113,616 certified votes. Below: the 2018 result and this district's margin across every cycle on record.

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CA-21 — 2018 result

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

Democratic (D)

57,239

50.4%

Republican (R)

56,377

49.6%

All others

0

0.0%

Margin

D+0.8

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Margin history

CA-21 across every cycle on record. Each year links to its district page.

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Year	Won	Margin	Votes
2024	D	+5.1%	195,531
2022	D	+8.4%	125,647
2020	R	−0.9%	170,334
2018	D	+0.8%	113,616
2016	R	−13.5%	132,408
2014	R	−15.7%	79,377
2012	R	−15.5%	116,283
2010	R	−100.0%	135,979
2008	R	−36.8%	209,815
2006	R	−36.8%	142,661
2004	R	−46.3%	192,315
2002	R	−44.3%	124,198
2000	R	−46.8%	199,100
1998	R	−78.9%	146,983
1996	R	−39.4%	191,152
1994	R	−40.4%	171,629
1992	R	−30.5%	195,965
1990	R	−24.4%	202,611
1988	R	−40.2%	262,671
1986	R	−40.2%	193,091
1984	R	−46.4%	239,968
1982	R	−47.8%	192,767
1980	R	−0.5%	153,400
1978	D	+23.6%	124,138
1976	D	+37.7%	153,109