| District ▲ | Winner | Party | Votes | % | Margin |
|---|---|---|---|---|---|
| CA-01 | REP | 200,673 | 53.3% | R+6.5 | |
| CA-02 | Wally HergerREP | REP | 214,860 | 64.2% | R+38.1 |
| CA-03 | Vic FazioDEM | DEM | 195,157 | 49.8% | D+3.6 |
| CA-04 | REP | 236,323 | 61.3% | R+26.4 | |
| CA-05 | DEM | 182,596 | 68.5% | D+39.5 | |
| CA-06 | DEM | 236,840 | 58.1% | D+20.6 | |
| CA-07 | DEM | 166,601 | 69.7% | D+42.3 | |
| CA-08 | Nancy PelosiDEM | DEM | 168,171 | 81.8% | D+63.7 |
| CA-09 | DEM | 178,875 | 72.3% | D+49.6 | |
| CA-10 | REP | 234,241 | 59.3% | R+20.7 | |
| CA-11 | REP | 159,814 | 62.1% | R+27.2 | |
| CA-12 | Tom LantosDEM | DEM | 175,636 | 67.4% | D+34.8 |
| CA-13 | DEM | 150,642 | 64.6% | D+34.4 | |
| CA-14 | Anna G EshooDEM | DEM | 199,188 | 60.6% | D+21.2 |
| CA-15 | DEM | 200,204 | 59.9% | D+19.8 | |
| CA-16 | Zoe LofgrenDEM | DEM | 115,352 | 65.0% | D+29.9 |
| CA-17 | Sam FarrDEM | DEM | 167,193 | 52.2% | D+7.7 |
| CA-18 | DEM | 139,054 | 65.5% | D+33.8 | |
| CA-19 | REP | 183,926 | 56.8% | R+17.1 | |
| CA-20 | DEM | 101,230 | 56.7% | D+13.4 | |
| CA-21 | REP | 171,629 | 68.1% | R+40.4 | |
| CA-22 | REP | 209,008 | 49.3% | R+0.8 | |
| CA-23 | REP | 172,340 | 66.2% | R+38.7 | |
| CA-24 | DEM | 193,179 | 49.4% | D+1.8 | |
| CA-25 | REP | 169,971 | 64.9% | R+33.5 | |
| CA-26 | DEM | 88,138 | 62.6% | D+30.3 | |
| CA-27 | REP | 166,774 | 53.0% | R+10.8 | |
| CA-28 | David DreierREP | REP | 164,277 | 67.1% | R+36.6 |
| CA-29 | DEM | 190,376 | 68.0% | D+39.7 | |
| CA-30 | DEM | 66,425 | 66.2% | D+37.9 | |
| CA-31 | DEM | 85,467 | 59.1% | D+18.3 | |
| CA-32 | DEM | 126,306 | 77.6% | D+60.0 | |
| CA-33 | DEM | 41,508 | 81.5% | D+81.5 | |
| CA-34 | DEM | 117,455 | 61.7% | D+27.6 | |
| CA-35 | DEM | 84,081 | 78.1% | D+56.3 | |
| CA-36 | Jane HarmanDEM | DEM | 195,808 | 48.0% | D+0.4 |
| CA-37 | DEM | 82,931 | 77.4% | D+77.4 | |
| CA-38 | Stephan HornREP | REP | 145,769 | 58.5% | R+21.6 |
| CA-39 | REP | 171,244 | 66.4% | R+37.3 | |
| CA-40 | Jerry LewisREP | REP | 163,731 | 70.7% | R+41.4 |
| CA-41 | Jay KimREP | REP | 132,143 | 62.1% | R+24.3 |
| CA-42 | DEM | 115,205 | 51.1% | D+2.3 | |
| CA-43 | Ken CalvertREP | REP | 154,386 | 54.7% | R+16.3 |
| CA-44 | Sonny BonoREP | REP | 171,776 | 55.6% | R+17.6 |
| CA-45 | REP | 180,724 | 69.1% | R+38.2 | |
| CA-46 | REP | 88,697 | 57.1% | R+19.9 | |
| CA-47 | REP | 214,997 | 71.7% | R+46.7 | |
| CA-48 | Ron PackardREP | REP | 195,636 | 73.4% | R+51.1 |
| CA-49 | REP | 186,118 | 48.5% | R+2.5 | |
| CA-50 | Bob FilnerDEM | DEM | 104,451 | 56.7% | D+21.3 |
| CA-51 | REP | 206,988 | 66.9% | R+39.2 | |
| CA-52 | REP | 170,686 | 64.0% | R+32.9 |