| District ▲ | Winner | Party | Votes | % | Margin |
|---|---|---|---|---|---|
| CA-01 | Doug LamalfaREP | REP | 216,372 | 61.0% | R+22.1 |
| CA-02 | DEM | 217,524 | 75.0% | D+50.0 | |
| CA-03 | DEM | 150,260 | 52.7% | D+5.5 | |
| CA-04 | REP | 211,134 | 60.0% | R+100.0 | |
| CA-05 | DEM | 171,148 | 75.7% | D+75.7 | |
| CA-06 | DEM | 133,456 | 72.7% | D+45.4 | |
| CA-07 | Ami BeraDEM | DEM | 183,587 | 50.4% | D+0.8 |
| CA-08 | Paul CookREP | REP | 114,536 | 67.7% | R+35.3 |
| CA-09 | DEM | 121,204 | 52.4% | D+4.7 | |
| CA-10 | Jeff DenhemREP | REP | 125,705 | 56.1% | R+12.3 |
| CA-11 | DEM | 174,662 | 67.3% | D+34.5 | |
| CA-12 | Nancy PelosiDEM | DEM | 192,264 | 83.3% | D+66.5 |
| CA-13 | Barbara LeeDEM | DEM | 190,431 | 88.5% | D+77.0 |
| CA-14 | DEM | 149,146 | 76.7% | D+53.4 | |
| CA-15 | DEM | 142,906 | 69.8% | D+39.6 | |
| CA-16 | Jim CostaDEM | DEM | 91,220 | 50.7% | D+1.5 |
| CA-17 | DEM | 134,408 | 51.8% | D+100.0 | |
| CA-18 | Anna G EshooDEM | DEM | 196,386 | 67.8% | D+35.5 |
| CA-19 | Zoe LofgrenDEM | DEM | 127,788 | 67.2% | D+100.0 |
| CA-20 | Sam FarrDEM | DEM | 141,044 | 75.2% | D+75.2 |
| CA-21 | REP | 79,377 | 57.8% | R+15.7 | |
| CA-22 | REP | 133,342 | 72.0% | R+44.1 | |
| CA-23 | REP | 134,043 | 74.8% | R+49.7 | |
| CA-24 | Lois CappsDEM | DEM | 198,794 | 51.9% | D+3.9 |
| CA-25 | REP | 114,072 | 53.3% | R+100.0 | |
| CA-26 | DEM | 169,829 | 51.3% | D+2.7 | |
| CA-27 | Judy ChuDEM | DEM | 127,580 | 59.4% | D+18.7 |
| CA-28 | DEM | 120,264 | 76.5% | D+76.5 | |
| CA-29 | DEM | 67,141 | 74.6% | D+49.2 | |
| CA-30 | Brad ShermanDEM | DEM | 131,883 | 65.6% | D+31.3 |
| CA-31 | Pete AguilarDEM | DEM | 99,784 | 51.7% | D+3.5 |
| CA-32 | DEM | 84,406 | 59.7% | D+19.3 | |
| CA-33 | Ted W LieuDEM | DEM | 183,031 | 59.2% | D+18.4 |
| CA-34 | DEM | 61,621 | 72.5% | D+100.0 | |
| CA-35 | DEM | 62,255 | 63.5% | D+100.0 | |
| CA-36 | Raul RuizDEM | DEM | 134,139 | 54.2% | D+8.4 |
| CA-37 | Karen BassDEM | DEM | 114,838 | 84.3% | D+68.6 |
| CA-38 | DEM | 98,480 | 59.1% | D+18.2 | |
| CA-39 | REP | 133,225 | 68.5% | R+37.1 | |
| CA-40 | DEM | 49,379 | 61.2% | D+100.0 | |
| CA-41 | DEM | 82,884 | 56.6% | D+13.3 | |
| CA-42 | Ken CalvertREP | REP | 113,390 | 65.7% | R+31.5 |
| CA-43 | DEM | 98,202 | 71.0% | D+41.9 | |
| CA-44 | Janice HahnDEM | DEM | 68,862 | 86.7% | D+86.7 |
| CA-45 | Mimi WaltersREP | REP | 162,902 | 65.1% | R+30.2 |
| CA-46 | DEM | 83,315 | 59.7% | D+19.4 | |
| CA-47 | DEM | 123,400 | 56.0% | D+12.0 | |
| CA-48 | REP | 174,795 | 64.1% | R+28.2 | |
| CA-49 | REP | 163,142 | 60.2% | R+20.3 | |
| CA-50 | REP | 157,299 | 71.2% | R+42.4 | |
| CA-51 | Juan VargasDEM | DEM | 81,950 | 68.8% | D+37.6 |
| CA-52 | DEM | 191,572 | 51.6% | D+3.2 | |
| CA-53 | DEM | 148,044 | 58.8% | D+17.7 |