| District ID | 20th District |
| Representative | Kevin McCarthy |
| Party Affiliation | Republican |
| Partisan Voting Index (PVI) | D+23 |
| 93203 |
| 93205 |
| 93206 |
| 93207 |
| 93208 |
| 93215 |
| 93221 |
| 93222 |
| 93224 |
| 93225 |
| 93226 |
| 93230 |
| 93237 |
| 93238 |
| 93240 |
| 93242 |
| 93243 |
| 93244 |
| 93245 |
| 93246 |
| 93247 |
| 93251 |
| 93252 |
| 93255 |
| 93257 |
| 93260 |
| 93262 |
| 93265 |
| 93267 |
| 93268 |
| 93271 |
| 93274 |
| 93276 |
| 93277 |
| 93283 |
| 93285 |
| 93286 |
| 93287 |
| 93291 |
| 93292 |
| 93301 |
| 93306 |
| 93307 |
| 93308 |
| 93309 |
| 93311 |
| 93312 |
| 93313 |
| 93314 |
| 93453 |
| 93501 |
| 93516 |
| 93518 |
| 93519 |
| 93523 |
| 93524 |
| 93527 |
| 93528 |
| 93531 |
| 93536 |
| 93554 |
| 93555 |
| 93560 |
| 93561 |
| 93581 |
| 93602 |
| 93603 |
| 93611 |
| 93612 |
| 93619 |
| 93621 |
| 93626 |
| 93631 |
| 93633 |
| 93636 |
| 93641 |
| 93646 |
| 93647 |
| 93651 |
| 93654 |
| 93656 |
| 93657 |
| 93664 |
| 93667 |
| 93675 |
| 93710 |
| 93725 |
| 93726 |
| 93727 |
| 93737 |
| 93740 |