U.S. House seat for California's 31st congressional district. Representatives serve two-year terms.

3 candidates filed, 2 active for the 2026 House election in California District 31. General election on Nov 3, 2026.
| Year | Winner | Result | Runner-Up | Total Votes |
|---|---|---|---|---|
| 2024 | Gil Cisneros D | 59.7% | 247,951 | |
| 2022 | Grace F Napolitano D | 59.5% | 153,625 | |
| 2020 | Pete Aguilar D | 61.3% | 286,050 | |
| 2018 | Pete Aguilar D | 58.7% | 187,495 | |
| 2016 | Pete Aguilar D | 56.1% | 215,936 | |
| 2014 | Pete Aguilar D | 51.7% | 99,784 | |
| 2012 | Gary G Miller R | 55.2% | 161,219 | |
| 2010 | Xavier Becerra D | 83.8% | 91,103 | |
| 2008 | Xavier Becerra D | 100.0% | 110,955 | |
| 2006 | Xavier Becerra D | 100.0% | 64,952 | |
| 2004 | Xavier Becerra D | 80.2% | 111,411 | |
| 2002 | Xavier Becerra D | 81.2% | 67,243 | |
| 2000 | Hilda L Solis D | 79.4% | 112,914 | |
| 1998 | Matthew G Martinez D | 70.0% | 87,360 | |
| 1996 | Matthew G Martinez D | 67.5% | 102,690 |