Pennsylvania House of Representatives seat · lines in effect since 2022
Pennsylvania House District 128
A district of about 57,000 people, 37% of adults with a bachelor's degree. It votes R+16.9 relative to the nation for president.
Where it sits among all 203 seats
Every Pennsylvania House of Representatives seat by partisan lean, from most Democratic to most Republican. Lean is the seat's presidential vote on current lines, relative to the nation.
Democratic
Source: 99chambers: 2024 and 2020 presidential results on current lines, relative to the nation (2024 weighted 3:1)Updated Oct 16, 2026, 5:19 AM ET
Every race on these lines
Results recomputed from precinct returns as if today's boundaries had always existed, so years compare like for like.
| 2016 | 2018 | 2024 | 2026 | |
|---|---|---|---|---|
| U.S. Senate | R+23.2 | R+6.4 | R+8.5 | No race |
| Governor | No race | R+2.6 | No race | No race |
| Pennsylvania House of Representatives | No race | No race | No race | R+7.5 |
Outlined: the race for this seat itselfBlank: no race that year
Source: 99chambers results archive: precinct results allocated to current lines; 2026: civicAPIUpdated Nov 7, 2026, 3:01 PM ET
Who lives here, compared
Grey bars show the spread of all 203 seats. Small marks are other seats in Pennsylvania. The black marker is District 128.
Higher than 64% of seats.
Higher than 57% of seats.
Higher than 73% of seats.
Lower than 55% of seats.
Lower than 61% of seats.
Less dense than 66% of seats.
Source: Census Bureau, American Community Survey 2020–2024 5-year estimates, allocated to current linesUpdated Oct 13, 2026, 5:06 AM ET
Seats most like this one
Nearest seats on demographics, density and lean.
District 14536% college gradsR+15.1Held RDistrict 97
40% college gradsR+16.1CountingDistrict 138
32% college gradsR+21.0Held RDistrict 98
35% college gradsR+24.8Held R
Source: Census Bureau, American Community Survey 2020–2024 5-year estimates, allocated to current lines; 99chambers: 2024 and 2020 presidential results on current lines, relative to the nation (2024 weighted 3:1)Updated Oct 16, 2026, 5:19 AM ET
Who has held it
These lines took effect in 2022.
- Mark M. Gillen (R)
2023– · Won 2022 unopposed, 2024 unopposed, 2026 by 7.5
Source: Past results: 99chambers results archive (MEDSL, Klarner, state election offices)