CA-31 elected a Democrat in 2018.

D+17.5 on 187,495 certified votes. Below: the 2018 result and this district's margin across every cycle on record.

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CA-31 — 2018 result

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

Democratic (D)

110,143

58.7%

Republican (R)

77,352

41.3%

All others

0

0.0%

Margin

D+17.5

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Margin history

CA-31 across every cycle on record. Each year links to its district page.

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Year	Won	Margin	Votes
2024	D	+19.5%	247,951
2022	D	+19.1%	153,625
2020	D	+22.6%	286,050
2018	D	+17.5%	187,495
2016	D	+12.1%	215,936
2014	D	+3.5%	99,784
2012	R	−100.0%	161,219
2010	D	+67.6%	91,106
2008	D	+100.0%	110,955
2006	D	+100.0%	64,952
2004	D	+60.4%	111,411
2002	D	+62.3%	67,243
2000	D	+79.4%	112,914
1998	D	+47.4%	87,360
1996	D	+39.5%	102,690
1994	D	+18.3%	85,467
1992	D	+25.1%	109,197
1990	D	+34.3%	83,987
1988	D	+46.0%	141,027
1986	D	+42.6%	109,781
1984	D	+41.4%	142,349
1982	D	+44.8%	119,761
1980	D	+28.8%	107,349
1978	D	+35.5%	82,157
1976	D	+100.0%	83,155