Pennsylvania State Senate seat · lines in effect since 2022
Pennsylvania Senate District 31
A district of about 268,000 people, 31% of adults with a bachelor's degree. It votes R+14.3 relative to the nation for president.
2024 election
Nov 5, 2024- Dawn Keefer (R) · won60.8%
- Mark Joseph Temons II (D)39.2%
Source: Pennsylvania Department of StateUpdated Oct 1, 2026, 6:19 AM ET
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 election for this seat
15 races since 1968. District numbers are redrawn after each census: each group is one set of lines.
| Year | Winner | Runner-up | Won by |
|---|---|---|---|
| Lines first used in 2022 | |||
| 2024 | Dawn Keefer (R) | Mark Joseph Temons II (D) | 21.7 |
| Lines first used in 2012 | |||
| 2020 | Michael R. Regan (R) | Shanna Danielson (D) | 21.0 |
| 2016 | Michael R. Regan (R) | John Bosha (D) | 36.1 |
| 2012 | Patricia H. Vance (R) | — | Unopposed |
| Lines first used in 2002 | |||
| 2008 | Patricia H. Vance (R) | Susan Kiskis (D) | 42.6 |
| 2004 | Patricia H. Vance (R) | Sean Patrick Quinlan (D) | 48.4 |
| Lines first used in 1992 | |||
| 2000 | Harold F. Mowery Jr. (R) | James H. Hertzler (D) | 31.8 |
| 1996 | Harold F. Mowery Jr. (R) | James M. Hoefler (D) | 35.8 |
| 1992 | Harold F. Mowery Jr. (R) | Robert M. Fowler (D) | 8.0 |
| Lines first used in 1982 | |||
| 1988 | John D. Hopper (R) | Edward F. Alexander (D) | 38.0 |
| 1984 | John D. Hopper (R) | John E. Rowland (D) | 31.5 |
| Lines first used in 1972 | |||
| 1980 | John D. Hopper (R) | Mark David Frankel (D) | 36.9 |
| 1976 | John D. Hopper (R) | Robert L. Myers III (D) | 2.1 |
| 1972 | George N. Wade (R) | Gerald A. New (D) | 12.6 |
| Lines first used in 1962 | |||
| 1968 | George N. Wade (R) | Gordon T. Jones (D) | 34.5 |
Won by: the winner's lead over the runner-up, in points of the vote. Source: 99chambers results archive (MEDSL, Klarner, state election offices)
Districts that overlap District 31
The state's districts in other chambers that share residents with this one, and the share of District 31's area in each.
- U.S. House
- PA-10 100%
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 | 2020 | 2024 | |
|---|---|---|---|---|
| President | R+18.2 | No race | R+13.9 | R+15.5 |
| U.S. Senate | R+19.0 | R+6.6 | No race | R+13.6 |
| Governor | No race | D+2.0 | No race | No race |
Outlined: the race for this seat itselfBlank: no race that year
Source: 99chambers results archive: precinct results allocated to current lines; 2026: civicAPIUpdated Nov 8, 2026, 7:01 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 31.
Lower than 51% of seats.
Higher than 53% of seats.
Higher than 80% of seats.
Higher than 69% of seats.
Lower than 67% of seats.
Denser than 53% 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 1330% college gradsR+13.3Not up in 2026District 36
36% college gradsR+15.8Flipped RDistrict 40
27% college gradsR+4.9CountingDistrict 22
29% college gradsD+5.6Held 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