U.S. House seat for California's 45th congressional district. Representatives serve two-year terms.

8 candidates filed, 2 active for the 2026 House election in California District 45. General election on Nov 3, 2026.
| Year | Winner | Result | Runner-Up | Total Votes |
|---|---|---|---|---|
| 2024 | Derek Tran D | 50.1% | 315,875 | |
| 2022 | Michelle Steel R | 52.4% | 217,426 | |
| 2020 | Katie Porter D | 53.5% | 414,939 | |
| 2018 | Katie Porter D | 52.1% | 305,289 | |
| 2016 | Mimi Walters R | 58.6% | 311,849 | |
| 2014 | Mimi Walters R | 65.1% | 162,902 | |
| 2012 | John Campbell R | 58.5% | 293,231 | |
| 2010 | Mary Bono Mack R | 51.5% | 206,801 | |
| 2008 | Mary Bono Mack R | 58.3% | 266,192 | |
| 2006 | Mary Bono R | 60.7% | 164,251 | |
| 2004 | Mary Bono R | 66.6% | 230,490 | |
| 2002 | Mary Bono R | 65.2% | 133,533 | |
| 2000 | Dana Rohrabacher R | 62.1% | 219,385 | |
| 1998 | Dana Rohrabacher R | 58.7% | 160,770 | |
| 1996 | Dana Rohrabacher R | 61.0% | 205,522 |