| District ▲ | Winner | Party | Votes | % | Margin |
|---|---|---|---|---|---|
| CA-01 | REP | 291,594 | 54.9% | R+9.8 | |
| CA-02 | DEM | 315,657 | 77.0% | D+54.0 | |
| CA-03 | DEM | 232,251 | 58.1% | D+16.1 | |
| CA-04 | REP | 340,654 | 54.1% | R+8.3 | |
| CA-05 | DEM | 261,018 | 78.9% | D+78.9 | |
| CA-06 | DEM | 201,939 | 80.4% | D+100.0 | |
| CA-07 | Ami BeraDEM | DEM | 281,617 | 55.0% | D+10.1 |
| CA-08 | Paul CookREP | REP | 170,785 | 60.0% | R+100.0 |
| CA-09 | DEM | 200,763 | 56.5% | D+13.0 | |
| CA-10 | Josh HarderDEM | DEM | 221,900 | 52.3% | D+4.5 |
| CA-11 | DEM | 275,681 | 74.1% | D+48.3 | |
| CA-12 | Nancy PelosiDEM | DEM | 317,072 | 86.8% | D+73.7 |
| CA-13 | Barbara LeeDEM | DEM | 294,837 | 88.4% | D+88.4 |
| CA-14 | DEM | 266,823 | 79.2% | D+58.5 | |
| CA-15 | DEM | 243,929 | 73.0% | D+45.9 | |
| CA-16 | Jim CostaDEM | DEM | 142,959 | 57.5% | D+15.1 |
| CA-17 | Ro KhannaDEM | DEM | 211,162 | 75.3% | D+50.7 |
| CA-18 | Anna G EshooDEM | DEM | 302,238 | 74.5% | D+49.0 |
| CA-19 | Zoe LofgrenDEM | DEM | 220,319 | 73.8% | D+47.5 |
| CA-20 | DEM | 225,721 | 81.4% | D+81.4 | |
| CA-21 | Tj CoxDEM | DEM | 113,616 | 50.4% | D+0.8 |
| CA-22 | REP | 222,379 | 52.7% | R+5.4 | |
| CA-23 | REP | 205,774 | 63.7% | R+27.4 | |
| CA-24 | DEM | 284,431 | 58.6% | D+17.1 | |
| CA-25 | Katie HillDEM | DEM | 245,022 | 54.4% | D+8.7 |
| CA-26 | DEM | 255,426 | 61.9% | D+23.9 | |
| CA-27 | Judy ChuDEM | DEM | 202,636 | 79.2% | D+100.0 |
| CA-28 | DEM | 250,934 | 78.4% | D+56.7 | |
| CA-29 | DEM | 154,692 | 80.6% | D+61.2 | |
| CA-30 | Brad ShermanDEM | DEM | 260,993 | 73.4% | D+46.8 |
| CA-31 | Pete AguilarDEM | DEM | 187,495 | 58.7% | D+17.5 |
| CA-32 | DEM | 177,031 | 68.8% | D+37.6 | |
| CA-33 | Ted W LieuDEM | DEM | 312,860 | 70.0% | D+40.1 |
| CA-34 | Jimmy GomezDEM | DEM | 151,906 | 72.5% | D+72.5 |
| CA-35 | DEM | 149,024 | 69.4% | D+38.8 | |
| CA-36 | Raul RuizDEM | DEM | 207,008 | 59.0% | D+18.0 |
| CA-37 | Karen BassDEM | DEM | 236,378 | 89.1% | D+78.2 |
| CA-38 | DEM | 202,156 | 68.8% | D+37.7 | |
| CA-39 | Gil CisnerosDEM | DEM | 244,393 | 51.6% | D+3.1 |
| CA-40 | DEM | 121,449 | 77.3% | D+77.3 | |
| CA-41 | DEM | 166,248 | 65.1% | D+30.2 | |
| CA-42 | Ken CalvertREP | REP | 231,932 | 56.5% | R+13.0 |
| CA-43 | DEM | 196,052 | 77.7% | D+55.3 | |
| CA-44 | DEM | 143,322 | 68.3% | D+100.0 | |
| CA-45 | Katie PorterDEM | DEM | 305,289 | 52.0% | D+4.1 |
| CA-46 | Lou CorreaDEM | DEM | 147,916 | 69.2% | D+38.3 |
| CA-47 | DEM | 221,036 | 64.9% | D+29.7 | |
| CA-48 | Harley RoudaDEM | DEM | 294,736 | 53.5% | D+7.1 |
| CA-49 | Mike LevinDEM | DEM | 295,030 | 56.4% | D+12.8 |
| CA-50 | REP | 259,810 | 51.7% | R+3.4 | |
| CA-51 | Juan VargasDEM | DEM | 153,828 | 71.2% | D+42.4 |
| CA-52 | DEM | 296,007 | 63.9% | D+27.7 | |
| CA-53 | DEM | 268,794 | 69.1% | D+38.1 |