U.S. House seat for Pennsylvania's 12th congressional district. Representatives serve two-year terms.

6 candidates filed, 2 active for the 2026 House election in Pennsylvania District 12. Party primary on May 19, 2026. General election on Nov 3, 2026.
| Year | Winner | Result | Runner-Up | Total Votes |
|---|---|---|---|---|
| 2024 | Summer L. Lee D | 56.4% | 416,228 | |
| 2022 | Summer Lee D | 56.2% | 328,620 | |
| 2020 | Frederick B Keller R | 70.8% | 340,234 | |
| 2018 | Thomas A Marino R | 66.0% | 243,872 | |
| 2016 | Keith J Rothfus R | 61.8% | 359,204 | |
| 2014 | Keith J Rothfus R | 59.3% | 215,921 | |
| 2012 | Keith J Rothfus R | 51.7% | 338,941 | |
| 2010 | Mark S Critz D | 50.8% | 185,226 | |
| 2008 | John P Murtha D | 57.9% | 268,388 | |
| 2006 | John P Murtha D | 60.8% | 203,084 | |
| 2004 | John P Murtha D | 100.0% | 204,504 | |
| 2002 | John P Murtha D | 73.5% | 169,019 | |
| 2000 | John P Murtha D | 70.8% | 205,437 | |
| 1998 | John P Murtha D | 68.5% | 146,767 | |
| 1996 | John P Murtha D | 70.0% | 195,458 |