| District ▲ | Winner | Party | Votes | % | Margin |
|---|---|---|---|---|---|
| CA-01 | DEM | 196,805 | 61.8% | D+29.0 | |
| CA-02 | Wally HergerREP | REP | 205,347 | 62.5% | R+28.0 |
| CA-03 | Doug OseREP | REP | 192,006 | 52.4% | R+7.4 |
| CA-04 | REP | 248,224 | 62.6% | R+28.2 | |
| CA-05 | DEM | 181,768 | 71.9% | D+45.9 | |
| CA-06 | DEM | 232,981 | 68.0% | D+38.3 | |
| CA-07 | DEM | 164,132 | 76.7% | D+53.3 | |
| CA-08 | Nancy PelosiDEM | DEM | 172,462 | 85.8% | D+73.8 |
| CA-09 | Barbara LeeDEM | DEM | 169,895 | 82.8% | D+69.6 |
| CA-10 | DEM | 237,809 | 53.5% | D+10.0 | |
| CA-11 | REP | 155,449 | 61.4% | R+25.2 | |
| CA-12 | Tom LantosDEM | DEM | 173,212 | 74.0% | D+52.9 |
| CA-13 | DEM | 142,787 | 71.2% | D+44.6 | |
| CA-14 | Anna G EshooDEM | DEM | 188,910 | 68.6% | D+40.2 |
| CA-15 | REP | 184,778 | 60.5% | R+22.6 | |
| CA-16 | Zoe LofgrenDEM | DEM | 117,414 | 72.8% | D+49.4 |
| CA-17 | Sam FarrDEM | DEM | 160,690 | 64.5% | D+31.9 |
| CA-18 | DEM | 136,931 | 86.8% | D+86.8 | |
| CA-19 | REP | 165,149 | 79.4% | R+79.4 | |
| CA-20 | DEM | 99,782 | 60.7% | D+21.5 | |
| CA-21 | REP | 146,983 | 78.9% | R+78.9 | |
| CA-22 | Lois CappsDEM | DEM | 199,264 | 55.0% | D+11.8 |
| CA-23 | REP | 160,354 | 60.1% | R+20.1 | |
| CA-24 | Brad ShermanDEM | DEM | 180,580 | 57.3% | D+18.8 |
| CA-25 | REP | 152,682 | 74.7% | R+74.7 | |
| CA-26 | DEM | 83,662 | 82.5% | D+82.5 | |
| CA-27 | REP | 159,066 | 50.7% | R+4.3 | |
| CA-28 | David DreierREP | REP | 157,200 | 57.6% | R+18.4 |
| CA-29 | DEM | 178,094 | 73.9% | D+51.3 | |
| CA-30 | DEM | 70,671 | 82.4% | D+64.8 | |
| CA-31 | DEM | 87,360 | 70.0% | D+47.4 | |
| CA-32 | DEM | 129,492 | 86.7% | D+75.4 | |
| CA-33 | DEM | 49,674 | 87.2% | D+74.4 | |
| CA-34 | DEM | 113,075 | 67.6% | D+39.0 | |
| CA-35 | DEM | 88,145 | 89.3% | D+89.3 | |
| CA-36 | REP | 181,706 | 48.9% | R+2.3 | |
| CA-37 | DEM | 82,327 | 85.1% | D+70.1 | |
| CA-38 | Stephen HornREP | REP | 134,858 | 52.9% | R+8.6 |
| CA-39 | REP | 155,465 | 62.6% | R+28.7 | |
| CA-40 | Jerry LewisREP | REP | 150,125 | 64.9% | R+33.0 |
| CA-41 | REP | 128,414 | 53.2% | R+12.5 | |
| CA-42 | DEM | 112,520 | 55.3% | D+15.0 | |
| CA-43 | Ken CalvertREP | REP | 149,071 | 55.7% | R+17.9 |
| CA-44 | Mary BonoREP | REP | 161,528 | 60.1% | R+24.3 |
| CA-45 | REP | 160,770 | 58.6% | R+21.3 | |
| CA-46 | DEM | 85,002 | 56.4% | D+17.1 | |
| CA-47 | REP | 196,316 | 67.6% | R+38.1 | |
| CA-48 | Ron PackardREP | REP | 180,719 | 76.9% | R+76.9 |
| CA-49 | REP | 185,519 | 48.8% | R+2.2 | |
| CA-50 | Bob FilnerDEM | DEM | 77,354 | 100.0% | D+100.0 |
| CA-51 | REP | 206,878 | 61.0% | R+26.4 | |
| CA-52 | REP | 153,564 | 75.7% | R+75.7 |