U.S. House seat for California's 42nd congressional district. Representatives serve two-year terms.

6 candidates filed, 2 active for the 2026 House election in California District 42. General election on Nov 3, 2026.
| Year | Winner | Result | Runner-Up | Total Votes |
|---|---|---|---|---|
| 2024 | Robert Garcia D | 68.1% | 233,563 | |
| 2022 | Robert Garcia D | 68.4% | 145,120 | |
| 2020 | Ken Calvert R | 57.1% | 368,047 | |
| 2018 | Ken Calvert R | 56.5% | 231,932 | |
| 2016 | Ken Calvert R | 58.8% | 254,236 | |
| 2014 | Ken Calvert R | 65.7% | 113,390 | |
| 2012 | Ken Calvert R | 60.6% | 214,947 | |
| 2010 | Gary G Miller R | 62.2% | 204,398 | |
| 2008 | Gary G Miller R | 60.2% | 263,313 | |
| 2006 | Gary G Miller R | 100.0% | 129,720 | |
| 2004 | Gary G Miller R | 68.1% | 246,025 | |
| 2002 | Gary G Miller R | 67.8% | 145,246 | |
| 2000 | Joe Baca D | 59.8% | 151,577 | |
| 1998 | George E Brown Jr D | 55.3% | 112,520 | |
| 1996 | George E Brown Jr D | 50.5% | 103,336 |