| District ID | 1st District |
| Representative | Andy Harris M.D. |
| Party Affiliation | Republican |
| Partisan Voting Index (PVI) | R+14 |
| 21930 |
| 21921 |
| 21920 |
| 21919 |
| 21918 |
| 21917 |
| 21915 |
| 21914 |
| 21913 |
| 21912 |
| 21911 |
| 21904 |
| 21903 |
| 21902 |
| 21901 |
| 21875 |
| 21874 |
| 21872 |
| 21871 |
| 21869 |
| 21866 |
| 21865 |
| 21864 |
| 21863 |
| 21862 |
| 21861 |
| 21856 |
| 21853 |
| 21851 |
| 21850 |
| 21849 |
| 21842 |
| 21841 |
| 21840 |
| 21838 |
| 21837 |
| 21835 |
| 21830 |
| 21829 |
| 21826 |
| 21824 |
| 21822 |
| 21821 |
| 21817 |
| 21814 |
| 21813 |
| 21811 |
| 21810 |
| 21804 |
| 21801 |
| 21679 |
| 21678 |
| 21677 |
| 21676 |
| 21675 |
| 21673 |
| 21672 |
| 21671 |
| 21669 |
| 21668 |
| 21667 |
| 21666 |
| 21665 |
| 21664 |
| 21663 |
| 21662 |
| 21661 |
| 21660 |
| 21659 |
| 21658 |
| 21657 |
| 21655 |
| 21654 |
| 21652 |
| 21651 |
| 21650 |
| 21649 |
| 21648 |
| 21647 |
| 21645 |
| 21644 |
| 21643 |
| 21641 |
| 21640 |
| 21639 |
| 21638 |
| 21636 |
| 21635 |
| 21634 |
| 21632 |
| 21631 |
| 21629 |
| 21628 |
| 21627 |
| 21626 |
| 21625 |
| 21623 |
| 21622 |
| 21620 |
| 21619 |
| 21617 |
| 21613 |
| 21612 |
| 21610 |
| 21607 |
| 21601 |
| 21236 |
| 21220 |
| 21162 |
| 21161 |
| 21160 |
| 21156 |
| 21154 |
| 21132 |
| 21131 |
| 21130 |
| 21128 |
| 21120 |
| 21111 |
| 21087 |
| 21085 |
| 21084 |
| 21082 |
| 21078 |
| 21057 |
| 21053 |
| 21051 |
| 21050 |
| 21047 |
| 21040 |
| 21034 |
| 21028 |
| 21017 |
| 21015 |
| 21014 |
| 21013 |
| 21010 |
| 21009 |
| 21005 |
| 21001 |