| District ▲ | Winner | Party | Votes | % | Margin |
|---|---|---|---|---|---|
| CA-01 | DEM | 216,166 | 49.9% | D+2.6 | |
| CA-02 | REP | 200,612 | 57.9% | R+17.4 | |
| CA-03 | DEM | 217,196 | 89.6% | D+89.6 | |
| CA-04 | Vic FazioDEM | DEM | 185,523 | 63.9% | D+27.7 |
| CA-05 | DEM | 178,311 | 57.9% | D+17.5 | |
| CA-06 | DEM | 184,064 | 52.4% | D+7.7 | |
| CA-07 | DEM | 188,869 | 67.2% | D+37.1 | |
| CA-08 | DEM | 217,231 | 56.0% | D+11.9 | |
| CA-09 | DEM | 172,095 | 60.7% | D+21.3 | |
| CA-10 | Don EdwardsDEM | DEM | 123,281 | 62.7% | D+29.0 |
| CA-11 | Tom LantosDEM | DEM | 192,372 | 57.1% | D+17.3 |
| CA-12 | Ed ZschauREP | REP | 183,208 | 63.0% | R+29.5 |
| CA-13 | DEM | 168,164 | 65.9% | D+34.5 | |
| CA-14 | REP | 211,625 | 63.4% | R+26.9 | |
| CA-15 | Tony CoelhoDEM | DEM | 135,043 | 63.7% | D+29.7 |
| CA-16 | DEM | 167,078 | 85.4% | D+70.7 | |
| CA-17 | REP | 148,635 | 54.0% | R+8.0 | |
| CA-18 | DEM | 155,927 | 59.5% | D+21.2 | |
| CA-19 | REP | 184,246 | 61.0% | R+25.2 | |
| CA-20 | REP | 181,081 | 68.1% | R+36.2 | |
| CA-21 | REP | 192,767 | 71.8% | R+47.8 | |
| CA-22 | REP | 198,222 | 73.6% | R+50.1 | |
| CA-23 | DEM | 202,819 | 59.5% | D+19.1 | |
| CA-24 | DEM | 136,069 | 65.0% | D+34.1 | |
| CA-25 | DEM | 83,166 | 85.5% | D+85.5 | |
| CA-26 | DEM | 163,455 | 59.6% | D+19.2 | |
| CA-27 | Mel LevineDEM | DEM | 182,217 | 59.5% | D+22.4 |
| CA-28 | DEM | 131,152 | 78.9% | D+60.2 | |
| CA-29 | DEM | 121,596 | 79.8% | D+59.6 | |
| CA-30 | DEM | 113,082 | 53.9% | D+7.7 | |
| CA-31 | DEM | 119,761 | 72.4% | D+44.8 | |
| CA-32 | DEM | 145,999 | 58.0% | D+18.4 | |
| CA-33 | David DreierREP | REP | 172,350 | 65.2% | R+33.0 |
| CA-34 | DEM | 119,342 | 57.2% | D+14.5 | |
| CA-35 | Jerry LewisREP | REP | 165,135 | 68.3% | R+36.6 |
| CA-36 | DEM | 140,907 | 54.3% | D+8.7 | |
| CA-37 | REP | 177,872 | 59.1% | R+20.6 | |
| CA-38 | DEM | 141,182 | 52.4% | D+8.9 | |
| CA-39 | REP | 179,372 | 72.2% | R+46.2 | |
| CA-40 | REP | 201,600 | 71.5% | R+45.5 | |
| CA-41 | Bill LoweryREP | REP | 203,461 | 68.9% | R+40.0 |
| CA-42 | REP | 207,049 | 69.0% | R+40.6 | |
| CA-43 | Ron PackardREP | REP | 180,736 | 36.8% | R+35.8 |
| CA-44 | Jim BatesDEM | DEM | 120,825 | 65.0% | D+33.1 |
| CA-45 | REP | 171,758 | 68.6% | R+39.4 |