Pennsylvania State House District 175
Tue, Nov 3 · Represented by Mary Isaacson Democratic · Member list as of Oct 28
Mary IsaacsonDemocratic · Incumbent8 years since first win
One candidate on the printed ballot.
- Last election
- Mary Isaacson (Democratic) was unopposed, 2024
- On the 2026 ballot
- 1 candidate
More about this race
Candidates on the ballot
Uncontested
One candidate on the printed ballot.
- Mary IsaacsonIncumbentDemocratic
Source: pavoterservices.pa.gov, dated Oct 28
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Official results for Pennsylvania
History (29 elections for this seat)
- Votes for listed candidates
- 29,976
- Election day
- November 5, 2024
- District map
- Older district map (2022 to 2024)
Pennsylvania House of Representatives District 175, 1968 to 2024, 2024, every candidate Candidate Party Votes and share Share DemocraticMary IsaacsonWonName as filed: Marylouise Isaacson Democratic 29,976100.0% - Votes for listed candidates
- 23,904
- Election day
- November 8, 2022
- District map
- Older district map (2022)
Pennsylvania House of Representatives District 175, 1968 to 2024, 2022, every candidate Candidate Party Votes and share Share DemocraticMary IsaacsonWon(incumbent)Name as filed: Marylouise Isaacson Democratic 23,904100.0% - Votes for listed candidates
- 30,233
- Election day
- November 3, 2020
- District map
- Older district map (2014 to 2021)
Pennsylvania House of Representatives District 175, 1968 to 2024, 2020, every candidate Candidate Party Votes and share Share DemocraticMary IsaacsonWon(incumbent)Name as filed: Marylouise Isaacson Democratic 30,233100.0% - Votes for listed candidates
- 24,538
- Election day
- November 6, 2018
- District map
- Older district map (2014 to 2021)
Pennsylvania House of Representatives District 175, 1968 to 2024, 2018, every candidate Candidate Party Votes and share Share DemocraticMary IsaacsonWonName as filed: Marylouise Isaacson Democratic 24,538100.0% - Votes for listed candidates
- 26,739
- Election day
- November 8, 2016
- District map
- Older district map (2014 to 2021)
Pennsylvania House of Representatives District 175, 1968 to 2024, 2016, every candidate Candidate Party Votes and share Share DemocraticMichael H. ObrienWon(incumbent) Democratic 26,739100.0% - Votes for listed candidates
- 12,394
- Election day
- November 4, 2014
- District map
- Older district map (2014 to 2021)
Pennsylvania House of Representatives District 175, 1968 to 2024, 2014, every candidate Candidate Party Votes and share Share DemocraticMichael H. ObrienWon(incumbent) Democratic 12,394100.0% - Votes for listed candidates
- 24,577
- Election day
- November 6, 2012
- District map
- Older district map (2002 to 2013)
Pennsylvania House of Representatives District 175, 1968 to 2024, 2012, every candidate Candidate Party Votes and share Share DemocraticMichael H. ObrienWon(incumbent) Democratic 24,577100.0% - Votes for listed candidates
- 16,353
- Election day
- November 2, 2010
- District map
- Older district map (2002 to 2013)
Pennsylvania House of Representatives District 175, 1968 to 2024, 2010, every candidate Candidate Party Votes and share Share DemocraticMichael H. ObrienWon(incumbent) Democratic 13,00679.5% RepublicanLouis S. Schwartz Republican 3,34720.5% - Votes for listed candidates
- 24,465
- Election day
- November 4, 2008
- District map
- Older district map (2002 to 2013)
Pennsylvania House of Representatives District 175, 1968 to 2024, 2008, every candidate Candidate Party Votes and share Share DemocraticMichael H. ObrienWon(incumbent) Democratic 24,465100.0% - Votes for listed candidates
- 16,631
- Election day
- November 7, 2006
- District map
- Older district map (2002 to 2013)
Pennsylvania House of Representatives District 175, 1968 to 2024, 2006, every candidate Candidate Party Votes and share Share DemocraticMichael H. ObrienWon Democratic 13,98384.1% RepublicanPatricia Dempsey Republican 2,64815.9% - Votes for listed candidates
- 24,379
- Election day
- November 2, 2004
- District map
- Older district map (2002 to 2013)
Pennsylvania House of Representatives District 175, 1968 to 2024, 2004, every candidate Candidate Party Votes and share Share DemocraticMarie A. LedererWon(incumbent) Democratic 19,77281.1% RepublicanGreg Mester Jr. Republican 4,60718.9% - Votes for listed candidates
- 11,725
- Election day
- November 5, 2002
- District map
- Older district map (2002 to 2013)
Pennsylvania House of Representatives District 175, 1968 to 2024, 2002, every candidate Candidate Party Votes and share Share DemocraticMarie A. LedererWon(incumbent) Democratic 11,725100.0% - Votes for listed candidates
- 18,375
- Election day
- November 7, 2000
- District map
- Older district map (1992 to 2001)
Pennsylvania House of Representatives District 175, 1968 to 2024, 2000, every candidate Candidate Party Votes and share Share DemocraticMarie A. LedererWon(incumbent) Democratic 13,45673.2% RepublicanTimothy Collins Republican 4,91926.8% - Votes for listed candidates
- 9,521
- Election day
- November 3, 1998
- District map
- Older district map (1992 to 2001)
Pennsylvania House of Representatives District 175, 1968 to 2024, 1998, every candidate Candidate Party Votes and share Share DemocraticMarie A. LedererWon(incumbent) Democratic 6,89672.4% RepublicanAnthony N. Radocaj Republican 2,62527.6% - Votes for listed candidates
- 17,124
- Election day
- November 5, 1996
- District map
- Older district map (1992 to 2001)
Pennsylvania House of Representatives District 175, 1968 to 2024, 1996, every candidate Candidate Party Votes and share Share DemocraticMarie A. LedererWon(incumbent) Democratic 12,50773.0% RepublicanAnthony N. Radocaj Republican 4,61727.0% - Votes for listed candidates
- 14,771
- Election day
- November 8, 1994
- District map
- Older district map (1992 to 2001)
Pennsylvania House of Representatives District 175, 1968 to 2024, 1994, every candidate Candidate Party Votes and share Share DemocraticMarie A. LedererWon(incumbent) Democratic 8,14755.2% RepublicanJoe Lonergan Republican 6,62444.8% - Votes for listed candidates
- 21,340
- Election day
- November 3, 1992
- District map
- Older district map (1992 to 2001)
Pennsylvania House of Representatives District 175, 1968 to 2024, 1992, every candidate Candidate Party Votes and share Share DemocraticMarie A. LedererWon Democratic 11,33253.1% RepublicanJoe Lonergan Republican 10,00846.9% - Votes for listed candidates
- 17,501
- Election day
- November 6, 1990
- District map
- Older district map (1982 to 1991)
Pennsylvania House of Representatives District 175, 1968 to 2024, 1990, every candidate Candidate Party Votes and share Share DemocraticGerard A. KosinskiWon(incumbent) Democratic 8,82650.4% RepublicanFortunato N. Perri Jr. Republican 8,67549.6% - Votes for listed candidates
- 21,331
- Election day
- November 8, 1988
- District map
- Older district map (1982 to 1991)
Pennsylvania House of Representatives District 175, 1968 to 2024, 1988, every candidate Candidate Party Votes and share Share DemocraticGerard A. KosinskiWon(incumbent) Democratic 14,40467.5% RepublicanRobert J. Skypala Republican 6,92732.5% - Votes for listed candidates
- 17,933
- Election day
- November 4, 1986
- District map
- Older district map (1982 to 1991)
Pennsylvania House of Representatives District 175, 1968 to 2024, 1986, every candidate Candidate Party Votes and share Share DemocraticGerard A. KosinskiWon(incumbent) Democratic 11,38163.5% RepublicanLouis Koreck Republican 6,55236.5% - Votes for listed candidates
- 24,530
- Election day
- November 6, 1984
- District map
- Older district map (1982 to 1991)
Pennsylvania House of Representatives District 175, 1968 to 2024, 1984, every candidate Candidate Party Votes and share Share DemocraticGerard A. KosinskiWon(incumbent) Democratic 13,64255.6% RepublicanThomas A. Brown Republican 10,88844.4% - Votes for listed candidates
- 19,083
- Election day
- November 2, 1982
- District map
- Older district map (1982 to 1991)
Pennsylvania House of Representatives District 175, 1968 to 2024, 1982, every candidate Candidate Party Votes and share Share DemocraticGerard A. KosinskiWon Democratic 12,21164.0% RepublicanDavid W. Brennan Jr. Republican 6,87236.0% - Votes for listed candidates
- 18,958
- Election day
- November 4, 1980
- District map
- Older district map (1972 to 1981)
Pennsylvania House of Representatives District 175, 1968 to 2024, 1980, every candidate Candidate Party Votes and share Share DemocraticRobert A. Borski Jr.Won(incumbent) Democratic 12,69967.0% RepublicanJohn G. Agnew Republican 6,25933.0% - Votes for listed candidates
- 20,574
- Election day
- November 7, 1978
- District map
- Older district map (1972 to 1981)
Pennsylvania House of Representatives District 175, 1968 to 2024, 1978, every candidate Candidate Party Votes and share Share DemocraticRobert A. Borski Jr.Won(incumbent) Democratic 11,36655.2% RepublicanJoseph F. Lewandowski Republican 9,20844.8% - Votes for listed candidates
- 23,621
- Election day
- November 2, 1976
- District map
- Older district map (1972 to 1981)
Pennsylvania House of Representatives District 175, 1968 to 2024, 1976, every candidate Candidate Party Votes and share Share DemocraticRobert A. Borski Jr.Won Democratic 13,19455.9% RepublicanFortunato N. Perri(incumbent) Republican 10,42744.1% - Votes for listed candidates
- 20,612
- Election day
- November 4, 1974
- District map
- Older district map (1972 to 1981)
Pennsylvania House of Representatives District 175, 1968 to 2024, 1974, every candidate Candidate Party Votes and share Share RepublicanFortunato N. PerriWon(incumbent) Republican 10,75652.2% DemocraticJohn Pezak Democratic 9,85647.8% - Votes for listed candidates
- 25,126
- Election day
- November 7, 1972
- District map
- Older district map (1972 to 1981)
Pennsylvania House of Representatives District 175, 1968 to 2024, 1972, every candidate Candidate Party Votes and share Share RepublicanFortunato N. PerriWon Republican 13,38153.3% DemocraticJohn Pezak(incumbent) Democratic 11,74546.7% - Votes for listed candidates
- 20,722
- Election day
- November 3, 1970
- District map
- Older district map (1966 to 1971)
Pennsylvania House of Representatives District 175, 1968 to 2024, 1970, every candidate Candidate Party Votes and share Share DemocraticJohn PezakWon(incumbent) Democratic 10,81552.2% RepublicanFortunato N. Perri Republican 9,90747.8% - Votes for listed candidates
- 23,817
- Election day
- November 5, 1968
- District map
- Older district map (1966 to 1971)
Pennsylvania House of Representatives District 175, 1968 to 2024, 1968, every candidate Candidate Party Votes and share Share DemocraticJohn PezakWon(incumbent) Democratic 12,59852.9% RepublicanStanley Chmielewski Republican 11,21947.1%
- 2024: MEDSL 2024 official precinct returns (individual_states zips), retrieved Oct 28, 2026. Compiled by MIT Election Data and Science Lab (MEDSL) from official returns; not an official source
- 1968 to 2022: State Legislative Election Returns, 1967-2022 (Carl Klarner, Harvard Dataverse), retrieved Oct 28, 2026. Compiled by Carl Klarner (Harvard Dataverse) from official returns; not an official source
Last contest in this district on file: 2024.
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Cite this page
Election Wrld. (2026). Pennsylvania State House District 175, election results 1968 to 2024. https://www.electionwrld.com/pa/house/175. Retrieved October 31, 2026.
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Sources
Sources: Census TIGERweb Legislative MapServer (120th CDs layer 0, 119th CDs layer 4, 2026 SLD upper layer 1 and lower layer 2) (US Census Bureau, public domain), retrieved Oct 28, 2026; Open Civic Data division identifiers (census_autogenerated us_sldl/us_sldu and openstates state files); also (sld-recent.json): Open Civic Data division identifiers (country-us) (CC0 (repository); also (sld-recent.json): CC0 1.0), retrieved Oct 28, 2026; Open States people (current) CSVs (CC0-1.0 (Open States people data)), retrieved Oct 28, 2026, compiled by Open States volunteers and staff (rosters from state legislature sites) from official returns, not an official source; MEDSL 2024 official precinct returns (individual_states zips) (Not stated in the GitHub repository (an earlier label said "MIT (repo)", which the repository does not support). MEDSL's Harvard Dataverse records are CC0 1.0, but these GitHub files were not checksum-matched to the Dataverse files, so CC0 is not claimed for them.), retrieved Oct 28, 2026, compiled by MIT Election Data and Science Lab (MEDSL) from official returns, not an official source; State Legislative Election Returns, 1967-2022 (Carl Klarner, Harvard Dataverse) (CC0 1.0), retrieved Oct 28, 2026, compiled by Carl Klarner (Harvard Dataverse) from official returns, not an official source.
District id: ocd-division/country:us/state:pa/sldl:175
DataState data (JSON)Sources: State Legislative Election Returns, 1967-2022 (Carl Klarner, Harvard Dataverse), DIME (ODC-BY), MEDSL 2024 official precinct returnsData as of Oct 28, 2026