| District ▲ | Winner | Party | Votes | % | Margin |
|---|---|---|---|---|---|
| CA-01 | REP | 294,213 | 57.4% | R+14.8 | |
| CA-02 | DEM | 317,526 | 71.2% | D+42.5 | |
| CA-03 | DEM | 233,968 | 54.2% | D+8.5 | |
| CA-04 | REP | 323,688 | 61.1% | R+22.2 | |
| CA-05 | DEM | 272,417 | 74.5% | D+48.9 | |
| CA-06 | DEM | 214,073 | 75.0% | D+50.1 | |
| CA-07 | Ami BeraDEM | DEM | 273,291 | 51.7% | D+3.4 |
| CA-08 | Paul CookREP | REP | 179,644 | 57.4% | R+100.0 |
| CA-09 | DEM | 213,077 | 55.5% | D+11.1 | |
| CA-10 | Jeff DenhamREP | REP | 209,199 | 52.7% | R+5.4 |
| CA-11 | DEM | 287,879 | 69.7% | D+39.5 | |
| CA-12 | Nancy PelosiDEM | DEM | 298,187 | 85.1% | D+70.2 |
| CA-13 | Barbara LeeDEM | DEM | 288,582 | 86.8% | D+86.8 |
| CA-14 | DEM | 258,283 | 78.9% | D+57.8 | |
| CA-15 | DEM | 231,034 | 52.1% | D+100.0 | |
| CA-16 | Jim CostaDEM | DEM | 147,450 | 57.4% | D+14.8 |
| CA-17 | DEM | 216,728 | 73.5% | D+47.1 | |
| CA-18 | Anna G EshooDEM | DEM | 301,934 | 70.5% | D+41.0 |
| CA-19 | Zoe LofgrenDEM | DEM | 221,613 | 73.2% | D+46.5 |
| CA-20 | Sam FarrDEM | DEM | 233,562 | 74.1% | D+48.1 |
| CA-21 | REP | 116,283 | 57.8% | R+15.5 | |
| CA-22 | REP | 213,941 | 61.9% | R+23.8 | |
| CA-23 | REP | 216,003 | 73.2% | R+73.2 | |
| CA-24 | Lois CappsDEM | DEM | 284,495 | 55.1% | D+10.2 |
| CA-25 | REP | 236,575 | 54.8% | R+9.6 | |
| CA-26 | DEM | 263,935 | 52.7% | D+5.4 | |
| CA-27 | Judy ChuDEM | DEM | 241,008 | 64.0% | D+28.0 |
| CA-28 | DEM | 246,711 | 76.5% | D+53.0 | |
| CA-29 | DEM | 150,281 | 74.0% | D+74.0 | |
| CA-30 | Brad ShermanDEM | DEM | 247,851 | 60.3% | D+100.0 |
| CA-31 | REP | 161,219 | 55.2% | R+100.0 | |
| CA-32 | DEM | 190,111 | 65.7% | D+31.4 | |
| CA-33 | DEM | 318,520 | 54.0% | D+54.0 | |
| CA-34 | DEM | 140,590 | 85.6% | D+71.2 | |
| CA-35 | DEM | 142,680 | 55.9% | D+100.0 | |
| CA-36 | Raul RuizDEM | DEM | 208,142 | 52.9% | D+5.9 |
| CA-37 | Karen BassDEM | DEM | 239,580 | 86.4% | D+72.8 |
| CA-38 | DEM | 215,087 | 67.5% | D+35.1 | |
| CA-39 | REP | 251,967 | 57.8% | R+15.6 | |
| CA-40 | DEM | 125,553 | 58.9% | D+100.0 | |
| CA-41 | DEM | 175,652 | 59.0% | D+17.9 | |
| CA-42 | Ken CalvertREP | REP | 214,947 | 60.6% | R+21.2 |
| CA-43 | DEM | 200,894 | 71.2% | D+100.0 | |
| CA-44 | Janice HahnDEM | DEM | 165,898 | 60.2% | D+100.0 |
| CA-45 | REP | 293,231 | 58.5% | R+16.9 | |
| CA-46 | DEM | 149,815 | 63.9% | D+27.8 | |
| CA-47 | DEM | 230,012 | 56.6% | D+13.1 | |
| CA-48 | REP | 290,502 | 61.0% | R+22.0 | |
| CA-49 | REP | 274,618 | 58.2% | R+16.3 | |
| CA-50 | REP | 258,293 | 67.7% | R+35.4 | |
| CA-51 | Juan VargasDEM | DEM | 159,398 | 71.5% | D+43.0 |
| CA-52 | DEM | 295,910 | 51.2% | D+2.4 | |
| CA-53 | DEM | 268,307 | 61.4% | D+22.9 |