| District ID | 18th District |
| Representative | Zoe Lofgren |
| Party Affiliation | Democrat |
| Partisan Voting Index (PVI) | D+23 |
| 95192 |
| 95148 |
| 95140 |
| 95138 |
| 95135 |
| 95128 |
| 95127 |
| 95126 |
| 95125 |
| 95122 |
| 95116 |
| 95113 |
| 95112 |
| 95110 |
| 95076 |
| 95075 |
| 95046 |
| 95045 |
| 95043 |
| 95037 |
| 95035 |
| 95023 |
| 95020 |
| 95019 |
| 95012 |
| 95004 |
| 94550 |
| 93960 |
| 93954 |
| 93932 |
| 93930 |
| 93928 |
| 93927 |
| 93926 |
| 93925 |
| 93924 |
| 93920 |
| 93908 |
| 93907 |
| 93906 |
| 93905 |
| 93901 |
| 93451 |
| 93450 |
| 93426 |