Pennsylvania House of Representatives seat · lines in effect since 2022
Pennsylvania House District 18
A district of about 63,000 people, 32% of adults with a bachelor's degree. It votes R+1.2 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 | 2022 | 2024 | 2026 | |
|---|---|---|---|---|---|
| U.S. Senate | D+4.9 | D+20.8 | No race | No race | No race |
| Governor | No race | D+24.8 | No race | No race | No race |
| Pennsylvania House of Representatives | No race | No race | R+4.6 | R+11.3 | D+9.7 |
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 18.
Higher than 56% of seats.
Lower than 53% of seats.
Higher than 85% of seats.
Higher than 67% of seats.
Higher than 96% of seats.
Denser than 74% 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 17431% college gradsD+5.2Held DDistrict 172
31% college gradsD+1.2Held DDistrict 170
33% college gradsR+13.2Held RDistrict 88
45% college gradsR+1.0Flipped D
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.
- Bryan F. Allen Jr. (D)
2027– · Won 2026 by 9.7 - Kathleen Christine Tomlinson (R)
2023–2027 · Won 2022 by 4.6, 2024 by 11.3
Source: Past results: 99chambers results archive (MEDSL, Klarner, state election offices)