| Rank | Water Area ▼ | School District / Population |
| 1. | 442.24 sq mi | Dorchester County Public Schools / 32,614 |
| 2. | 407.07 sq mi | St. Marys County Public Schools / 108,472 |
| 3. | 290.63 sq mi | Somerset County Public Schools / 26,197 |
| 4. | 226.58 sq mi | Worcester County Public Schools / 51,558 |
| 5. | 208.27 sq mi | Talbot County Public Schools / 37,894 |
| 6. | 185.22 sq mi | Charles County Public Schools / 150,960 |
| 7. | 172.90 sq mi | Anne Arundel County Public Schools / 550,269 |
| 8. | 138.78 sq mi | Queen Annes County Public Schools / 48,439 |
| 9. | 136.41 sq mi | Kent County Public Schools / 20,016 |
| 10. | 131.92 sq mi | Calvert County Public Schools / 89,793 |
| 11. | 89.55 sq mi | Harford County Public Schools / 248,029 |
| 12. | 83.45 sq mi | Baltimore County Public Schools / 817,720 |
| 13. | 71.56 sq mi | Cecil County Public Schools / 101,803 |
| 14. | 25.79 sq mi | Wicomico County Public Schools / 100,376 |
| 15. | 16.15 sq mi | Prince George's County Public Schools / 884,764 |
| 16. | 15.69 sq mi | Montgomery County Public Schools / 1,005,087 |
| 17. | 11.11 sq mi | Baltimore City Public Schools / 622,271 |
| 18. | 9.56 sq mi | Washington County Public Schools / 148,913 |
| 19. | 8.63 sq mi | Garrett County Public Schools / 29,945 |
| 20. | 7.16 sq mi | Frederick County Public Schools / 239,253 |
| 21. | 6.48 sq mi | Caroline County Public Schools / 32,759 |
| 22. | 5.77 sq mi | Allegany County Public Schools / 73,976 |
| 23. | 5.09 sq mi | Carroll County Public Schools / 167,399 |
| 24. | 2.65 sq mi | Howard County Public Schools / 299,269 |
Please note that we only rank locations with 'Water Area' data. The rank above might not be a complete list. Locations without 'Water Area' data are not listed.
