| District ID | 42nd District |
| Representative | Robert Garcia |
| Party Affiliation | Democrat |
| Partisan Voting Index (PVI) | R+9 |
| 90001 |
| 90002 |
| 90011 |
| 90022 |
| 90023 |
| 90040 |
| 90058 |
| 90201 |
| 90240 |
| 90241 |
| 90242 |
| 90255 |
| 90270 |
| 90280 |
| 90640 |
| 90703 |
| 90704 |
| 90706 |
| 90712 |
| 90713 |
| 90715 |
| 90716 |
| 90740 |
| 90744 |
| 90755 |
| 90802 |
| 90803 |
| 90804 |
| 90806 |
| 90807 |
| 90808 |
| 90813 |
| 90814 |
| 90815 |
| 90822 |
| 90831 |
| 90840 |
| 90844 |
| 90846 |
| 92649 |