| District ▲ | Winner | Party | Votes | % | Margin |
|---|---|---|---|---|---|
| CA-01 | Doug LamalfaREP | REP | 246,225 | 62.1% | R+24.1 |
| CA-02 | DEM | 308,749 | 74.4% | D+48.8 | |
| CA-03 | Kevin KileyREP | REP | 338,199 | 53.6% | R+7.3 |
| CA-04 | DEM | 260,907 | 67.8% | D+35.6 | |
| CA-05 | REP | 283,030 | 61.3% | R+22.6 | |
| CA-06 | Ami BeraDEM | DEM | 216,383 | 56.0% | D+11.9 |
| CA-07 | DEM | 220,651 | 68.3% | D+36.5 | |
| CA-08 | DEM | 192,135 | 75.7% | D+51.5 | |
| CA-09 | Josh HarderDEM | DEM | 174,400 | 54.8% | D+9.6 |
| CA-10 | DEM | 251,380 | 78.9% | D+78.9 | |
| CA-11 | Nancy PelosiDEM | DEM | 263,065 | 84.0% | D+67.9 |
| CA-12 | Barbara LeeDEM | DEM | 239,969 | 90.5% | D+81.0 |
| CA-13 | John DuarteREP | REP | 133,556 | 50.2% | R+0.4 |
| CA-14 | DEM | 198,464 | 69.3% | D+38.7 | |
| CA-15 | Kevin MullinDEM | DEM | 194,874 | 55.5% | D+100.0 |
| CA-16 | Anna G EshooDEM | DEM | 241,007 | 57.8% | D+100.0 |
| CA-17 | Ro KhannaDEM | DEM | 180,253 | 70.9% | D+41.9 |
| CA-18 | Zoe LofgrenDEM | DEM | 151,513 | 65.8% | D+31.7 |
| CA-19 | DEM | 283,310 | 68.7% | D+37.3 | |
| CA-20 | REP | 228,781 | 67.3% | R+34.5 | |
| CA-21 | Jim CostaDEM | DEM | 125,647 | 54.2% | D+8.4 |
| CA-22 | REP | 102,856 | 51.5% | R+3.0 | |
| CA-23 | REP | 169,105 | 61.0% | R+22.1 | |
| CA-24 | DEM | 262,552 | 60.6% | D+21.1 | |
| CA-25 | Raul RuizDEM | DEM | 152,742 | 57.4% | D+14.8 |
| CA-26 | DEM | 246,789 | 54.5% | D+9.1 | |
| CA-27 | Mike GarciaREP | REP | 196,516 | 53.2% | R+6.5 |
| CA-28 | Judy ChuDEM | DEM | 226,557 | 66.2% | D+32.5 |
| CA-29 | DEM | 119,435 | 58.5% | D+100.0 | |
| CA-30 | DEM | 211,068 | 71.1% | D+100.0 | |
| CA-31 | DEM | 153,625 | 59.5% | D+19.1 | |
| CA-32 | Brad ShermanDEM | DEM | 242,029 | 69.2% | D+38.3 |
| CA-33 | Pete AguilarDEM | DEM | 132,707 | 57.7% | D+15.4 |
| CA-34 | Jimmy GomezDEM | DEM | 121,467 | 51.2% | D+100.0 |
| CA-35 | DEM | 130,953 | 57.4% | D+14.7 | |
| CA-36 | Ted W LieuDEM | DEM | 278,563 | 69.8% | D+39.5 |
| CA-37 | DEM | 131,880 | 64.0% | D+100.0 | |
| CA-38 | DEM | 174,311 | 58.1% | D+16.2 | |
| CA-39 | DEM | 131,597 | 57.7% | D+15.3 | |
| CA-40 | Young KimREP | REP | 284,311 | 56.8% | R+13.7 |
| CA-41 | Ken CalvertREP | REP | 236,638 | 52.4% | R+4.7 |
| CA-42 | DEM | 145,120 | 68.4% | D+36.7 | |
| CA-43 | DEM | 123,447 | 77.3% | D+54.7 | |
| CA-44 | DEM | 138,714 | 72.2% | D+44.4 | |
| CA-45 | REP | 217,426 | 52.4% | R+4.8 | |
| CA-46 | DEM | 126,298 | 61.8% | D+23.6 | |
| CA-47 | Katie PorterDEM | DEM | 265,635 | 51.7% | D+3.4 |
| CA-48 | REP | 257,071 | 60.4% | R+20.7 | |
| CA-49 | Mike LevinDEM | DEM | 291,735 | 52.6% | D+5.3 |
| CA-50 | DEM | 268,635 | 62.8% | D+25.7 | |
| CA-51 | Sara JacobsDEM | DEM | 233,072 | 61.9% | D+23.7 |
| CA-52 | Juan VargasDEM | DEM | 151,016 | 66.7% | D+33.3 |