| District ID | 4th District |
| Representative | Glenn Ivey |
| Party Affiliation | Democrat |
| Partisan Voting Index (PVI) | D+28 |
| 20607 |
| 20613 |
| 20705 |
| 20706 |
| 20707 |
| 20708 |
| 20710 |
| 20712 |
| 20720 |
| 20721 |
| 20722 |
| 20723 |
| 20724 |
| 20735 |
| 20737 |
| 20740 |
| 20742 |
| 20743 |
| 20744 |
| 20745 |
| 20746 |
| 20747 |
| 20748 |
| 20755 |
| 20759 |
| 20762 |
| 20769 |
| 20770 |
| 20771 |
| 20774 |
| 20781 |
| 20782 |
| 20783 |
| 20784 |
| 20785 |
| 20866 |
| 20868 |
| 20903 |
| 20904 |
| 20905 |
| 20912 |