California's 21st congressional district: election results

U.S. House elections in California's 21st congressional district, 1976 to 2024: winners, vote shares and margins. District lines are redrawn after each census, so the area covered changes over time.

Current representative: Jim Costa (Democrat), term ends 2027-01-03.

California's 21st congressional district: Republican minus Democratic share, in points. Bars above the line lean Republican, below lean Democratic.

Year	Winner	Party	Share	Margin
2024	Jim Costa	Democratic	52.6%	5.2
2022	Jim Costa	Democratic	54.2%	8.4
2020	David G. Valadao	Republican	50.4%	0.9
2018	TJ Cox	Democratic	50.4%	0.8
2016	David G. Valadao	Republican	56.7%	13.5
2014	David G. Valadao	Republican	57.8%	15.7
2012	David G. Valadao	Republican	57.8%	15.5
2010	Devin Nunes	Republican	100.0%	—
2008	Devin Nunes	Republican	68.4%	36.8
2006	Devin Nunes	Republican	66.7%	36.8
2004	Devin Nunes	Republican	73.2%	46.3
2002	Devin Nunes	Republican	70.5%	44.3
2000	William M. Thomas	Republican	71.6%	46.8
1998	William M. Thomas	Republican	78.9%	57.8
1982	Roberta Frances Fiedler	Republican	71.8%	47.8
1980	Roberta Frances Fiedler	Republican	48.7%	0.5
1978	James C. Corman	Democratic	59.5%	23.6
1976	James C. Corman	Democratic	66.5%	37.7

2024

Candidate	Party	Votes	Share
Jim Costa Won	DEM	102,798	52.57%
Michael Maher	REP	92,733	47.43%
Total		195,531

2022

Candidate	Party	Votes	Share
Jim Costa Won	DEM	68,074	54.18%
Michael Maher	REP	57,573	45.82%
Total		125,647

2020

Candidate	Party	Votes	Share
David G. Valadao Won	REP	85,928	50.45%
TJ Cox	DEM	84,406	49.55%
Total		170,334

Questions and answers

Who represents California's 21st congressional district?

Jim Costa (Democrat) is the current representative; the term ends on 2027-01-03.

Who won the last election in California's 21st congressional district?

Jim Costa won in 2024 by 5.2 points.

Results: FiveThirtyEight, from official sources.