U.S. House seat for California's 18th congressional district. Representatives serve two-year terms.

8 candidates filed, 2 active for the 2026 House election in California District 18. General election on Nov 3, 2026.
| Year | Winner | Result | Runner-Up | Total Votes |
|---|---|---|---|---|
| 2024 | Zoe Lofgren D | 64.6% | 228,506 | |
| 2022 | Zoe Lofgren D | 65.9% | 151,513 | |
| 2020 | Anna G Eshoo D | 63.2% | 344,139 | |
| 2018 | Anna G Eshoo D | 74.5% | 302,238 | |
| 2016 | Anna G Eshoo D | 71.1% | 323,930 | |
| 2014 | Anna G Eshoo D | 67.8% | 196,386 | |
| 2012 | Anna G Eshoo D | 70.5% | 301,934 | |
| 2010 | Dennis A Cardoza D | 58.5% | 124,569 | |
| 2008 | Dennis A Cardoza D | 100.0% | 130,192 | |
| 2006 | Dennis A Cardoza D | 65.5% | 108,713 | |
| 2004 | Dennis A Cardoza D | 67.5% | 153,705 | |
| 2002 | Dennis A Cardoza D | 51.3% | 109,544 | |
| 2000 | Gary A Condit D | 67.1% | 180,328 | |
| 1998 | Gary A Condit D | 86.8% | 136,931 | |
| 1996 | Gary A Condit D | 65.7% | 165,586 |