U.S. House seat for Texas's 20th congressional district. Representatives serve two-year terms.

5 candidates filed, 2 active for the 2026 House election in Texas District 20. Party primary on Mar 3, 2026. General election on Nov 3, 2026.
| Year | Winner | Result | Runner-Up | Total Votes |
|---|---|---|---|---|
| 2024 | Joaquin Castro D | 100.0% | 157,890 | |
| 2022 | Joaquin Castro D | 68.4% | 168,578 | |
| 2020 | Joaquin Castro D | 64.7% | 270,723 | |
| 2018 | Joaquin Castro D | 80.9% | 171,963 | |
| 2016 | Joaquin Castro D | 79.7% | 187,669 | |
| 2014 | Joaquin Castro D | 75.7% | 87,964 | |
| 2012 | Joaquin Castro D | 63.9% | 186,177 | |
| 2010 | Charles A Gonzalez D | 63.6% | 92,185 | |
| 2008 | Charles A Gonzalez D | 71.9% | 177,055 | |
| 2006 | Charles A Gonzalez D | 87.4% | 78,245 | |
| 2004 | Charles A Gonzalez D | 65.5% | 171,804 | |
| 2002 | Charles A Gonzalez D | 100.0% | 68,685 | |
| 2000 | Charles A Gonzalez D | 87.7% | 122,574 | |
| 1998 | Charlie Gonzalez D | 63.2% | 79,713 | |
| 1996 | Henry B Gonzalez D | 63.7% | 138,409 |