| District ▲ | Winner | Party | Votes | % | Margin |
|---|---|---|---|---|---|
| CA-01 | Doug LamalfaREP | REP | 319,228 | 65.3% | R+30.7 |
| CA-02 | DEM | 379,617 | 71.9% | D+43.8 | |
| CA-03 | Kevin KileyREP | REP | 422,313 | 55.5% | R+10.9 |
| CA-04 | DEM | 342,680 | 66.5% | D+32.9 | |
| CA-05 | REP | 368,562 | 61.8% | R+23.5 | |
| CA-06 | Ami BeraDEM | DEM | 287,072 | 57.6% | D+15.2 |
| CA-07 | DEM | 295,770 | 66.8% | D+33.5 | |
| CA-08 | DEM | 273,030 | 74.0% | D+47.9 | |
| CA-09 | Josh HarderDEM | DEM | 251,357 | 51.8% | D+3.6 |
| CA-10 | DEM | 364,544 | 66.5% | D+33.0 | |
| CA-11 | Nancy PelosiDEM | DEM | 339,111 | 81.0% | D+62.1 |
| CA-12 | DEM | 283,025 | 65.4% | D+100.0 | |
| CA-13 | Adam C GrayDEM | DEM | 210,921 | 50.0% | D+0.1 |
| CA-14 | DEM | 276,388 | 67.8% | D+35.5 | |
| CA-15 | Kevin MullinDEM | DEM | 289,544 | 73.1% | D+46.2 |
| CA-16 | Sam LiccardoDEM | DEM | 308,476 | 58.2% | D+100.0 |
| CA-17 | Ro KhannaDEM | DEM | 254,877 | 67.7% | D+35.3 |
| CA-18 | Zoe LofgrenDEM | DEM | 228,506 | 64.6% | D+29.3 |
| CA-19 | DEM | 364,320 | 69.3% | D+38.6 | |
| CA-20 | Vince FongREP | REP | 288,788 | 65.0% | R+100.0 |
| CA-21 | Jim CostaDEM | DEM | 195,531 | 52.6% | D+5.2 |
| CA-22 | REP | 167,507 | 53.4% | R+6.8 | |
| CA-23 | REP | 264,849 | 60.1% | R+20.3 | |
| CA-24 | DEM | 342,479 | 62.7% | D+25.4 | |
| CA-25 | Raul RuizDEM | DEM | 245,031 | 56.3% | D+12.5 |
| CA-26 | DEM | 334,306 | 56.0% | D+12.1 | |
| CA-27 | DEM | 300,090 | 51.3% | D+2.7 | |
| CA-28 | Judy ChuDEM | DEM | 314,944 | 64.9% | D+29.9 |
| CA-29 | DEM | 209,686 | 69.8% | D+39.5 | |
| CA-30 | DEM | 311,659 | 68.4% | D+36.8 | |
| CA-31 | Gil CisnerosDEM | DEM | 247,951 | 59.7% | D+19.5 |
| CA-32 | Brad ShermanDEM | DEM | 321,645 | 66.2% | D+32.4 |
| CA-33 | Pete AguilarDEM | DEM | 233,275 | 58.8% | D+17.6 |
| CA-34 | Jimmy GomezDEM | DEM | 189,414 | 55.6% | D+100.0 |
| CA-35 | DEM | 233,555 | 58.4% | D+16.8 | |
| CA-36 | Ted W LieuDEM | DEM | 357,987 | 68.7% | D+37.4 |
| CA-37 | DEM | 204,814 | 78.3% | D+78.3 | |
| CA-38 | DEM | 275,928 | 59.8% | D+19.7 | |
| CA-39 | DEM | 229,660 | 56.7% | D+13.4 | |
| CA-40 | Young KimREP | REP | 383,635 | 55.3% | R+10.5 |
| CA-41 | Ken CalvertREP | REP | 354,445 | 51.7% | R+3.4 |
| CA-42 | DEM | 233,563 | 68.1% | D+36.3 | |
| CA-43 | DEM | 213,232 | 75.1% | D+50.1 | |
| CA-44 | DEM | 230,852 | 71.4% | D+42.8 | |
| CA-45 | Derek TranDEM | DEM | 315,875 | 50.1% | D+0.2 |
| CA-46 | DEM | 211,292 | 63.4% | D+26.9 | |
| CA-47 | Dave MinDEM | DEM | 353,275 | 51.4% | D+2.9 |
| CA-48 | REP | 360,290 | 59.3% | R+18.6 | |
| CA-49 | Mike LevinDEM | DEM | 378,347 | 52.2% | D+4.3 |
| CA-50 | DEM | 360,695 | 64.3% | D+28.6 | |
| CA-51 | Sara JacobsDEM | DEM | 327,584 | 60.7% | D+21.4 |
| CA-52 | Juan VargasDEM | DEM | 259,718 | 66.3% | D+32.6 |