| District ▲ | Winner | Party | Votes | % | Margin |
|---|---|---|---|---|---|
| CA-01 | Doug LamalfaREP | REP | 358,263 | 57.0% | R+14.0 |
| CA-02 | DEM | 388,755 | 75.7% | D+51.5 | |
| CA-03 | DEM | 321,988 | 54.7% | D+9.3 | |
| CA-04 | REP | 442,022 | 56.0% | R+11.9 | |
| CA-05 | DEM | 356,460 | 76.1% | D+52.2 | |
| CA-06 | DEM | 313,114 | 73.3% | D+46.7 | |
| CA-07 | Ami BeraDEM | DEM | 383,965 | 56.6% | D+13.3 |
| CA-08 | REP | 283,111 | 56.1% | R+12.1 | |
| CA-09 | DEM | 302,610 | 57.6% | D+15.2 | |
| CA-10 | Josh HarderDEM | DEM | 302,494 | 55.2% | D+10.3 |
| CA-11 | DEM | 371,356 | 73.0% | D+46.0 | |
| CA-12 | Nancy PelosiDEM | DEM | 362,950 | 77.6% | D+100.0 |
| CA-13 | Barbara LeeDEM | DEM | 362,818 | 90.4% | D+80.7 |
| CA-14 | DEM | 351,005 | 79.3% | D+58.6 | |
| CA-15 | DEM | 342,701 | 70.9% | D+41.8 | |
| CA-16 | Jim CostaDEM | DEM | 216,729 | 59.4% | D+18.8 |
| CA-17 | Ro KhannaDEM | DEM | 297,336 | 71.3% | D+42.7 |
| CA-18 | Anna G EshooDEM | DEM | 344,139 | 63.2% | D+100.0 |
| CA-19 | Zoe LofgrenDEM | DEM | 313,027 | 71.7% | D+43.4 |
| CA-20 | DEM | 308,554 | 76.8% | D+53.5 | |
| CA-21 | REP | 170,334 | 50.5% | R+0.9 | |
| CA-22 | REP | 315,139 | 54.2% | R+8.4 | |
| CA-23 | REP | 306,118 | 62.1% | R+24.3 | |
| CA-24 | DEM | 362,345 | 58.7% | D+17.3 | |
| CA-25 | Mike GarciaREP | REP | 338,943 | 50.0% | R+0.1 |
| CA-26 | DEM | 344,733 | 60.6% | D+21.2 | |
| CA-27 | Judy ChuDEM | DEM | 317,318 | 69.8% | D+39.5 |
| CA-28 | DEM | 336,199 | 72.7% | D+45.3 | |
| CA-29 | DEM | 210,944 | 56.6% | D+100.0 | |
| CA-30 | Brad ShermanDEM | DEM | 345,464 | 69.5% | D+39.0 |
| CA-31 | Pete AguilarDEM | DEM | 286,050 | 61.3% | D+22.6 |
| CA-32 | DEM | 259,760 | 66.6% | D+33.2 | |
| CA-33 | Ted W LieuDEM | DEM | 380,428 | 67.6% | D+35.2 |
| CA-34 | Jimmy GomezDEM | DEM | 205,346 | 53.0% | D+100.0 |
| CA-35 | DEM | 244,346 | 69.3% | D+38.7 | |
| CA-36 | Raul RuizDEM | DEM | 306,849 | 60.3% | D+20.7 |
| CA-37 | Karen BassDEM | DEM | 296,621 | 85.9% | D+71.9 |
| CA-38 | DEM | 256,206 | 74.3% | D+100.0 | |
| CA-39 | Young KimREP | REP | 343,783 | 50.6% | R+1.2 |
| CA-40 | DEM | 186,381 | 72.7% | D+45.5 | |
| CA-41 | DEM | 262,573 | 64.0% | D+28.1 | |
| CA-42 | Ken CalvertREP | REP | 368,047 | 57.1% | R+14.3 |
| CA-43 | DEM | 277,898 | 71.7% | D+43.4 | |
| CA-44 | DEM | 206,036 | 67.8% | D+100.0 | |
| CA-45 | Katie PorterDEM | DEM | 414,939 | 53.5% | D+6.9 |
| CA-46 | DEM | 229,519 | 68.8% | D+37.5 | |
| CA-47 | DEM | 311,399 | 63.3% | D+26.5 | |
| CA-48 | REP | 395,100 | 51.1% | R+2.1 | |
| CA-49 | Mike LevinDEM | DEM | 386,506 | 53.1% | D+6.3 |
| CA-50 | REP | 362,390 | 54.0% | R+7.9 | |
| CA-51 | Juan VargasDEM | DEM | 242,437 | 68.3% | D+36.6 |
| CA-52 | DEM | 396,495 | 61.6% | D+23.1 | |
| CA-53 | Sara JacobsDEM | DEM | 334,858 | 59.5% | D+100.0 |