U.S. House seat for California's 1st congressional district. Representatives serve two-year terms.

14 candidates filed, 2 active for the 2026 House election in California District 1. General election on Nov 3, 2026.
| Year | Winner | Result | Runner-Up | Total Votes |
|---|---|---|---|---|
| 2024 | Doug Lamalfa R | 65.3% | 319,228 | |
| 2022 | Doug Lamalfa R | 62.1% | 246,225 | |
| 2020 | Doug Lamalfa R | 57.0% | 358,263 | |
| 2018 | Doug La Malfa R | 54.9% | 291,594 | |
| 2016 | Doug Lamalfa R | 59.1% | 314,036 | |
| 2014 | Doug Lamalfa R | 61.0% | 216,372 | |
| 2012 | Doug La Malfa R | 57.4% | 294,213 | |
| 2010 | Mike Thompson D | 62.8% | 234,592 | |
| 2008 | Mike Thompson D | 68.1% | 290,458 | |
| 2006 | Mike Thompson D | 66.2% | 218,005 | |
| 2004 | Mike Thompson D | 66.9% | 282,971 | |
| 2002 | Mike Thompson D | 64.1% | 185,216 | |
| 2000 | Mike Thompson D | 65.0% | 239,335 | |
| 1998 | Mike Thompson D | 61.8% | 196,805 | |
| 1996 | Frank Riggs R | 49.6% | 222,119 |