Pennsylvania State Senate seat · lines in effect since 2022
Pennsylvania Senate District 43
A district of about 247,000 people, 24% Black, 47% of adults with a bachelor's degree. It votes D+56.3 relative to the nation for president.
2024 election
Nov 5, 2024- Jay Costa (D) · won100.0%
Unopposed.
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 | Jay Costa (D) | — | Unopposed |
| Lines first used in 2012 | |||
| 2020 | Jay Costa (D) | — | Unopposed |
| 2016 | Jay Costa (D) | — | Unopposed |
| 2012 | Jay Costa (D) | — | Unopposed |
| Lines first used in 2002 | |||
| 2008 | Jay Costa (D) | — | Unopposed |
| 2004 | Jay Costa (D) | — | Unopposed |
| Lines first used in 1992 | |||
| 2000 | Jay Costa (D) | — | Unopposed |
| 1996 | Jay Costa (D) | Kathy Matta (R) | 42.0 |
| 1992 | Michael Dawida (D) | Linda Dilonardoschlegel (R) | 45.2 |
| Lines first used in 1982 | |||
| 1988 | Michael Dawida (D) | Dave Blasco (R) | 58.6 |
| 1984 | James A. Romanelli (D) | Mafalda D. Jones (R) | 56.8 |
| Lines first used in 1972 | |||
| 1980 | James A. Romanelli (D) | Charles Gomrick (R) | 46.5 |
| 1976 | James A. Romanelli (D) | — | Unopposed |
| 1972 | Frank Mazzei (D) | — | Unopposed |
| Lines first used in 1962 | |||
| 1968 | Frank Mazzei (D) | Alan Dale Kurtz (R) | 32.1 |
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 43
The state's districts in other chambers that share residents with this one, and the share of District 43's area in each.
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 | |
|---|---|---|---|
| President | D+53.1 | No race | D+50.5 |
| U.S. Senate | D+49.2 | D+59.9 | No race |
| Governor | No race | D+62.2 | 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 43.
Higher than 84% of seats.
Lower than 86% of seats.
Lower than 63% of seats.
Higher than 92% of seats.
Higher than 76% of seats.
Denser than 84% 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 4245% college gradsD+34.2Held DDistrict 17
61% college gradsD+40.1Not up in 2026District 4
49% Black · 44% college gradsD+68.3Held DDistrict 26
41% college gradsD+20.5Held 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