| City Name | County | Zip Code |
| Hagerstown | Washington | ***** |
| Halethorpe | Baltimore | 21227 |
| Hampstead | Carroll | 21074 |
| Hancock | Washington | 21750 |
| Hanover | Anne Arundel | ***** |
| Harmans | Anne Arundel | ***** |
| Harmony | Frederick | 21769 |
| Harney | Carroll | 21787 |
| Harrisonville | Baltimore | 21133 |
| Harwood | Anne Arundel | 20776 |
| Havre de Grace | Harford | 21078 |
| Hebbville | Baltimore | 21244 |
| Hebron | Wicomico | 21830 |
| Helen | Saint Mary's | 20635 |
| Henderson | Caroline | 21640 |
| Herald Harbor | Anne Arundel | 21032 |
| Hereford | Baltimore | 21111 |
| Hickory | Harford | 21050 |
| High Point | Carroll | 21122 |
| Highfield | Washington | 21719 |
| Highland | Howard | 20777 |
| Hillandale | Montgomery | 20903 |
| Hillcrest Heights | Prince George's | 20748 |
| Hillsboro | Caroline | 21641 |
| Hollywood | Saint Mary's | 20636 |
| Homewood | Allegany | 21502 |
| Hoopersville | Dorchester | 21634 |
| Houcksville | Carroll | 21074 |
| Hoyes | Garrett | 21531 |
| Hughesville | Charles | 20637 |
| Hunt Valley | Baltimore | ***** |
| Huntingtown | Calvert | 20639 |
| Hurlock | Dorchester | 21643 |
| Hutton | Garrett | 21550 |
| Hyattstown | Montgomery | 20871 |
| Hyattsville | Prince George's | ***** |
| Hydes | Baltimore | 21082 |
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