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California House District 66 Election Results

Compiled by EveryElectionResult.com's data team · Last updated 2026-08-30

California House District 66 was held by Democratic after the 2018 general election, a two-party margin of 20.8 points. This page covers every general election on record for this district from 1972 to 2018.

This page covers the state House (lower chamber) general election only, two-party vote totals (Democratic vs. Republican). District lines here are redrawn at least once a decade, so an older and newer election under the same district number don't necessarily cover the same voters -- see the sourcing note below.

Results by Election

ElectionWinning PartyDem. VotesGOP VotesDem. ShareMargin
1972 Democratic 64,615 27,642 70.0% 40.1 pts
1974 Democratic 36,275 14,060 72.1% 44.1 pts
1976 Democratic 45,078 23,693 65.5% 31.1 pts
1978 Democratic 41,475 22,047 65.3% 30.6 pts
1980 Democratic 50,503 32,027 61.2% 22.4 pts
1982 Democratic 41,289 38,741 51.6% 3.2 pts
1984 Democratic 52,588 39,935 56.8% 13.7 pts
1986 Democratic 44,824 24,358 64.8% 29.6 pts
1988 Democratic 56,506 41,710 57.5% 15.1 pts
1990 Democratic 44,944 30,824 59.3% 18.6 pts
1992 Republican 45,324 83,919 35.1% 29.9 pts
1994 Republican 34,017 79,814 29.9% 40.2 pts
1996 Republican 50,594 91,676 35.6% 28.9 pts
1998 Republican 48,949 78,961 38.3% 23.5 pts
2000 Republican 55,239 112,328 33.0% 34.1 pts
2002 Republican 25,930 55,205 32.0% 36.1 pts
2004 Republican 53,481 91,606 36.9% 26.3 pts
2006 Republican 39,081 62,582 38.4% 23.1 pts
2008 Republican 69,040 95,093 42.1% 15.9 pts
2010 Republican 44,134 81,176 35.2% 29.6 pts
2012 Democratic 102,136 84,372 54.8% 9.5 pts
2014 Republican 53,695 54,401 49.7% 0.7 pts
2016 Democratic 105,336 89,308 54.1% 8.2 pts
2018 Democratic 107,133 70,281 60.4% 20.8 pts

Winning Margin Over Time

1972: Democratic margin 40.1 pts 1974: Democratic margin 44.1 pts 1976: Democratic margin 31.1 pts 1978: Democratic margin 30.6 pts 1980: Democratic margin 22.4 pts 1982: Democratic margin 3.2 pts 1984: Democratic margin 13.7 pts 1986: Democratic margin 29.6 pts 1988: Democratic margin 15.1 pts 1990: Democratic margin 18.6 pts 1992: Republican margin 29.9 pts 1994: Republican margin 40.2 pts 1996: Republican margin 28.9 pts 1998: Republican margin 23.5 pts 2000: Republican margin 34.1 pts 2002: Republican margin 36.1 pts 2004: Republican margin 26.3 pts 2006: Republican margin 23.1 pts 2008: Republican margin 15.9 pts 2010: Republican margin 29.6 pts 2012: Democratic margin 9.5 pts 2014: Republican margin 0.7 pts 2016: Democratic margin 8.2 pts 2018: Democratic margin 20.8 pts 1972 1974 1976 1978 1980 1982 1984 1986 1988 1990 1992 1994 1996 1998 2000 2002 2004 2006 2008 2010 2012 2014 2016 2018

Frequently Asked Questions

Which party held California House District 66 at the 2018 election?

Democratic held California House District 66 at the 2018 general election, with a two-party margin of 20.8 points.

Which parties have held California House District 66 since 1972?

Since 1972, California House District 66 has been held by: Democratic, Republican.

What was the closest two-party race on record in California House District 66?

The closest two-party margin on record for California House District 66 was 2014, at just 0.7 percentage points.