Pennsylvania State Senate seat · lines in effect since 2022
Pennsylvania Senate District 10
A district of about 270,000 people, 49% of adults with a bachelor's degree. It votes D+11.3 relative to the nation for president.
Where it sits among all 50 seats
Every Pennsylvania State Senate 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 | 2026 | |
|---|---|---|---|---|
| U.S. Senate | D+2.6 | D+23.0 | No race | No race |
| Governor | No race | D+26.8 | No race | No race |
| Pennsylvania State Senate | No race | No race | D+17.2 | D+28.4 |
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 50 seats. Small marks are other seats in Pennsylvania. The black marker is District 10.
Higher than 86% of seats.
Lower than 67% of seats.
Higher than 55% of seats.
Lower than 55% of seats.
Higher than 67% of seats.
Denser than 65% 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 3852% college gradsD+10.2Held DDistrict 9
47% college gradsD+17.0Not up in 2026District 37
55% college gradsR+1.2Not up in 2026District 24
40% college gradsR+1.5Flipped 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.
- Steven J. Santarsiero (D)
2023– · Won 2022 by 17.2, 2026 by 28.4
Source: Past results: 99chambers results archive (MEDSL, Klarner, state election offices)