Pennsylvania House of Representatives seat · lines in effect since 2022
Pennsylvania House District 187
A district of about 71,000 people, 46% of adults with a bachelor's degree. It votes R+9.1 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+21.1 | D+3.0 | No race | No race |
| Governor | No race | D+10.1 | No race | No race |
| Pennsylvania House of Representatives | No race | No race | R+10.7 | D+2.2 |
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 187.
Higher than 79% of seats.
Lower than 58% of seats.
Higher than 79% of seats.
Lower than 61% of seats.
Higher than 74% of seats.
Less dense than 63% 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. 1 of the 4 flipped this year.
District 10645% college gradsR+9.5Held RDistrict 137
43% college gradsR+0.6Flipped DDistrict 46
46% college gradsR+14.5CountingDistrict 147
45% college gradsR+9.0Counting
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.
- Gary W. Day (R)
2025– · Won 2024 by 10.7 - Ryan Mackenzie (R)
2023–2025 · Won 2022 unopposed
Source: Past results: 99chambers results archive (MEDSL, Klarner, state election offices)