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Pennsylvania House District 166 Election Results

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

Pennsylvania House District 166 was held by Democratic after the 2018 general election, a two-party margin of 45.1 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 Republican 12,387 17,770 41.1% 17.9 pts
1974 Republican 10,341 12,888 44.5% 11.0 pts
1976 Republican 12,487 16,813 42.6% 14.8 pts
1978 Republican 7,092 15,809 31.0% 38.1 pts
1980 Republican 7,407 19,672 27.4% 45.3 pts
1982 Republican 8,865 14,492 38.0% 24.1 pts
1984 Republican 11,231 19,656 36.4% 27.3 pts
1986 Republican 7,323 15,543 32.0% 36.0 pts
1988 Republican 12,710 16,702 43.2% 13.6 pts
1990 Republican 12,429 13,109 48.7% 2.7 pts
1992 Democratic 16,265 15,460 51.3% 2.5 pts
1994 Democratic 13,222 11,023 54.5% 9.1 pts
1996 Democratic 16,923 11,925 58.7% 17.3 pts
1998 Democratic 12,796 8,574 59.9% 19.8 pts
2000 Democratic 20,361 9,010 69.3% 38.6 pts
2002 Democratic 15,703 8,844 64.0% 27.9 pts
2004 Democratic 20,979 14,041 59.9% 19.8 pts
2006 Democratic 18,626 9,238 66.8% 33.7 pts
2008 Democratic 24,305 11,177 68.5% 37.0 pts
2010 Democratic 14,924 10,678 58.3% 16.6 pts
2012 Democratic 21,611 12,637 63.1% 26.2 pts
2014 Democratic 14,325 8,375 63.1% 26.2 pts
2016 Democratic 23,783 12,236 66.0% 32.1 pts
2018 Democratic 22,702 8,598 72.5% 45.1 pts

Winning Margin Over Time

1972: Republican margin 17.9 pts 1974: Republican margin 11.0 pts 1976: Republican margin 14.8 pts 1978: Republican margin 38.1 pts 1980: Republican margin 45.3 pts 1982: Republican margin 24.1 pts 1984: Republican margin 27.3 pts 1986: Republican margin 36.0 pts 1988: Republican margin 13.6 pts 1990: Republican margin 2.7 pts 1992: Democratic margin 2.5 pts 1994: Democratic margin 9.1 pts 1996: Democratic margin 17.3 pts 1998: Democratic margin 19.8 pts 2000: Democratic margin 38.6 pts 2002: Democratic margin 27.9 pts 2004: Democratic margin 19.8 pts 2006: Democratic margin 33.7 pts 2008: Democratic margin 37.0 pts 2010: Democratic margin 16.6 pts 2012: Democratic margin 26.2 pts 2014: Democratic margin 26.2 pts 2016: Democratic margin 32.1 pts 2018: Democratic margin 45.1 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 Pennsylvania House District 166 at the 2018 election?

Democratic held Pennsylvania House District 166 at the 2018 general election, with a two-party margin of 45.1 points.

Which parties have held Pennsylvania House District 166 since 1972?

Since 1972, Pennsylvania House District 166 has been held by: Democratic, Republican.

What was the closest two-party race on record in Pennsylvania House District 166?

The closest two-party margin on record for Pennsylvania House District 166 was 1992, at just 2.5 percentage points.