| District ▲ | Winner | Party | Votes | % | Margin |
|---|---|---|---|---|---|
| CA-01 | REP | 222,119 | 49.6% | R+6.2 | |
| CA-02 | Wally HergerREP | REP | 238,326 | 60.8% | R+27.1 |
| CA-03 | Vic FazioDEM | DEM | 221,737 | 53.5% | D+12.4 |
| CA-04 | REP | 271,315 | 60.5% | R+24.4 | |
| CA-05 | DEM | 202,460 | 70.4% | D+44.3 | |
| CA-06 | DEM | 253,836 | 61.8% | D+27.8 | |
| CA-07 | DEM | 190,917 | 71.8% | D+49.5 | |
| CA-08 | Nancy PelosiDEM | DEM | 207,738 | 84.3% | D+72.0 |
| CA-09 | DEM | 200,968 | 77.0% | D+58.6 | |
| CA-10 | DEM | 283,183 | 48.6% | D+1.4 | |
| CA-11 | REP | 181,096 | 59.4% | R+23.2 | |
| CA-12 | Tom LantosDEM | DEM | 207,908 | 71.7% | D+48.0 |
| CA-13 | DEM | 175,539 | 65.2% | D+34.8 | |
| CA-14 | Anna G EshooDEM | DEM | 229,633 | 64.8% | D+33.6 |
| CA-15 | REP | 226,868 | 58.5% | R+23.7 | |
| CA-16 | Zoe LofgrenDEM | DEM | 143,207 | 65.7% | D+35.5 |
| CA-17 | Sam FarrDEM | DEM | 195,545 | 58.9% | D+21.1 |
| CA-18 | DEM | 165,586 | 65.7% | D+33.9 | |
| CA-19 | REP | 206,379 | 66.6% | R+38.3 | |
| CA-20 | DEM | 115,705 | 56.5% | D+17.4 | |
| CA-21 | REP | 191,152 | 65.9% | R+39.4 | |
| CA-22 | DEM | 244,186 | 48.5% | D+4.2 | |
| CA-23 | REP | 199,507 | 59.6% | R+24.5 | |
| CA-24 | Brad ShermanDEM | DEM | 214,848 | 49.4% | D+5.8 |
| CA-25 | REP | 196,203 | 62.4% | R+29.2 | |
| CA-26 | DEM | 102,515 | 65.9% | D+37.3 | |
| CA-27 | REP | 189,930 | 50.2% | R+7.0 | |
| CA-28 | David DreierREP | REP | 186,885 | 60.7% | R+23.7 |
| CA-29 | DEM | 214,817 | 67.6% | D+43.0 | |
| CA-30 | DEM | 80,590 | 72.3% | D+53.6 | |
| CA-31 | DEM | 102,690 | 67.5% | D+39.5 | |
| CA-32 | DEM | 151,427 | 82.4% | D+70.0 | |
| CA-33 | DEM | 57,828 | 82.1% | D+68.0 | |
| CA-34 | DEM | 138,440 | 68.4% | D+41.8 | |
| CA-35 | DEM | 108,488 | 85.5% | D+73.4 | |
| CA-36 | Jane HarmanDEM | DEM | 224,459 | 52.5% | D+8.6 |
| CA-37 | DEM | 102,646 | 85.0% | D+70.0 | |
| CA-38 | Stephen HornREP | REP | 167,645 | 52.6% | R+9.8 |
| CA-39 | REP | 192,290 | 62.8% | R+30.9 | |
| CA-40 | Jerry LewisREP | REP | 152,261 | 64.9% | R+35.9 |
| CA-41 | Jay KimREP | REP | 143,445 | 58.5% | R+25.5 |
| CA-42 | DEM | 103,336 | 50.5% | D+1.0 | |
| CA-43 | Ken CalvertREP | REP | 177,640 | 54.7% | R+16.8 |
| CA-44 | Sonny BonoREP | REP | 191,518 | 57.8% | R+19.2 |
| CA-45 | REP | 205,522 | 61.0% | R+27.7 | |
| CA-46 | DEM | 102,784 | 46.7% | D+1.0 | |
| CA-47 | REP | 243,777 | 65.7% | R+36.8 | |
| CA-48 | Ron PackardREP | REP | 221,391 | 65.9% | R+39.0 |
| CA-49 | REP | 206,768 | 52.6% | R+10.7 | |
| CA-50 | Bob FilnerDEM | DEM | 118,340 | 61.9% | D+29.4 |
| CA-51 | REP | 229,024 | 65.1% | R+36.1 | |
| CA-52 | REP | 178,321 | 65.5% | R+35.7 |