| District ▲ | Winner | Party | Votes | % | Margin |
|---|---|---|---|---|---|
| CA-01 | REP | 270,199 | 53.7% | R+13.8 | |
| CA-02 | REP | 261,674 | 54.1% | R+12.2 | |
| CA-03 | DEM | 241,865 | 70.6% | D+44.0 | |
| CA-04 | Vic FazioDEM | DEM | 205,055 | 65.3% | D+35.6 |
| CA-05 | DEM | 197,821 | 51.1% | D+5.8 | |
| CA-06 | DEM | 134,650 | 69.4% | D+43.7 | |
| CA-07 | DEM | 224,469 | 63.3% | D+31.9 | |
| CA-08 | DEM | 195,425 | 55.5% | D+16.3 | |
| CA-09 | DEM | 163,592 | 55.3% | D+14.2 | |
| CA-10 | Don EdwardsDEM | DEM | 164,543 | 62.1% | D+34.2 |
| CA-11 | Tom LantosDEM | DEM | 185,012 | 46.4% | D+3.1 |
| CA-12 | REP | 199,083 | 72.2% | R+53.6 | |
| CA-13 | DEM | 224,609 | 58.9% | D+23.4 | |
| CA-14 | REP | 220,579 | 60.7% | R+24.5 | |
| CA-15 | Tony CoelhoDEM | DEM | 150,491 | 71.8% | D+46.6 |
| CA-16 | DEM | 223,035 | 71.0% | D+46.5 | |
| CA-17 | REP | 182,939 | 70.6% | R+41.2 | |
| CA-18 | REP | 177,461 | 71.0% | R+42.0 | |
| CA-19 | REP | 209,603 | 77.7% | R+60.0 | |
| CA-20 | REP | 253,303 | 78.8% | R+61.8 | |
| CA-21 | REP | 153,400 | 48.7% | R+0.5 | |
| CA-22 | REP | 180,423 | 63.9% | R+32.0 | |
| CA-23 | DEM | 199,385 | 63.2% | D+31.7 | |
| CA-24 | DEM | 146,731 | 63.8% | D+36.7 | |
| CA-25 | DEM | 74,365 | 66.0% | D+37.6 | |
| CA-26 | REP | 164,514 | 71.0% | R+46.6 | |
| CA-27 | REP | 215,316 | 51.0% | R+4.5 | |
| CA-28 | DEM | 137,304 | 79.2% | D+62.3 | |
| CA-29 | DEM | 92,999 | 86.1% | D+75.1 | |
| CA-30 | DEM | 102,735 | 72.2% | D+48.6 | |
| CA-31 | DEM | 107,349 | 64.4% | D+28.8 | |
| CA-32 | DEM | 127,526 | 65.9% | D+35.1 | |
| CA-33 | REP | 172,804 | 70.8% | R+41.7 | |
| CA-34 | REP | 192,169 | 71.8% | R+47.7 | |
| CA-35 | David DreierREP | REP | 194,514 | 51.8% | R+6.4 |
| CA-36 | DEM | 168,690 | 52.5% | D+9.1 | |
| CA-37 | Jerry LewisREP | REP | 231,077 | 71.6% | R+46.4 |
| CA-38 | DEM | 165,437 | 55.5% | D+15.5 | |
| CA-39 | REP | 229,732 | 76.3% | R+52.5 | |
| CA-40 | REP | 304,997 | 70.2% | R+48.4 | |
| CA-41 | Bill LoweryREP | REP | 233,918 | 52.7% | R+9.4 |
| CA-42 | REP | 149,649 | 53.3% | R+6.5 | |
| CA-43 | REP | 345,176 | 86.6% | R+73.1 |