Feature Name | Class | Elev. meters | County | Latitude DMS | Longitude DMS |
| Hells Bottom Run | Stream | | Charles | 38 27 03 N | 076 52 31 W |
| Hells Crossing | Locale | 3 | Talbot | 38 47 12 N | 076 13 24 W |
| Helmsley Court | Populated Place | 162 | Baltimore | 39 23 13 N | 076 42 03 W |
| Helpers of the Sacred Heart Mission | Church | 149 | Baltimore | 39 24 33 N | 076 37 24 W |
| Hemingway Chapel African Methodist Episcopal Church | Church | 31 | Baltimore (city) | 39 14 57 N | 076 37 36 W |
| Hemlock Estates | Populated Place | 22 | Calvert | 38 22 07 N | 076 27 23 W |
| Hemlock Hill | Populated Place | 152 | Howard | 39 10 38 N | 076 57 43 W |
| Hemlock Ridge | Populated Place | 93 | Harford | 39 31 19 N | 076 15 24 W |
| Hemp Hills | Populated Place | 232 | Frederick | 39 29 35 N | 077 08 20 W |
| Hen and Chickens Island (historical) | Island | -3 | Worcester | 38 24 00 N | 075 08 28 W |
| Hen Island | Island | 5 | Cecil | 39 22 11 N | 075 50 53 W |
| Hen Island Creek | Stream | | Cecil | 39 22 08 N | 075 50 56 W |
| Henderson | Populated Place | 17 | Caroline | 39 04 27 N | 075 45 58 W |
| Henderson Community Park | Park | 16 | Caroline | 39 04 20 N | 075 45 37 W |
| Henderson Corner | Populated Place | 185 | Montgomery | 39 12 07 N | 077 14 44 W |
| Henderson Point | Cape | 0 | Anne Arundel | 39 04 53 N | 076 31 03 W |
| Henderson Point | Cape | 2 | Cecil | 39 33 11 N | 075 51 23 W |
| Henderson Post Office | Post Office | 17 | Caroline | 39 04 28 N | 075 45 56 W |
| Henderson School | School | 22 | Baltimore (city) | 39 18 14 N | 076 35 26 W |
| Henderson School (historical) | School | 16 | Caroline | 39 04 21 N | 075 45 42 W |
| Henderson United Methodist Church | Church | 19 | Caroline | 39 04 34 N | 075 46 05 W |
| Hendersons Wharf | Locale | 1 | Baltimore (city) | 39 16 50 N | 076 35 21 W |
| Hendricks Farm | Locale | 243 | Baltimore | 39 39 32 N | 076 42 10 W |
| Hendrix Oceanography Labratory | Building | 3 | Anne Arundel | 38 59 01 N | 076 28 46 W |
| Henekes Corner | Populated Place | 39 | Anne Arundel | 39 02 10 N | 076 29 35 W |
| Henley Park | Populated Place | 40 | Harford | 39 29 20 N | 076 14 56 W |
| Henleys | Populated Place | 182 | Frederick | 39 28 10 N | 077 16 58 W |
| Henry Fleet Primary School (historical) | School | 5 | Baltimore (city) | 39 17 05 N | 076 35 43 W |
| Henry G Ferguson Elementary School | School | 29 | Prince George's | 38 41 06 N | 076 58 40 W |
| Henry Highland Elementary School | School | 9 | Kent | 39 12 46 N | 076 04 12 W |
| Henrys Bridge | Populated Place | 184 | Baltimore | 39 31 52 N | 076 34 06 W |
| Henrys Crossroads | Populated Place | 1 | Dorchester | 38 25 16 N | 075 52 04 W |
| Henrys Crossroads School (historical) | School | 1 | Dorchester | 38 25 17 N | 075 52 07 W |
| Henryton | Populated Place | 95 | Carroll | 39 21 04 N | 076 54 48 W |
| Henryton Heights | Populated Place | 187 | Howard | 39 19 26 N | 076 55 19 W |
| Henryton Post Office | Post Office | 108 | Carroll | 39 21 09 N | 076 54 51 W |
| Henryton State Hospital | Hospital | 124 | Carroll | 39 21 12 N | 076 54 54 W |
| Henson Creek | Stream | | Prince George's | 38 45 40 N | 077 00 03 W |
| Henson Creek Golf Course | Locale | 31 | Prince George's | 38 47 19 N | 076 58 53 W |
| Henson Landing | Locale | 9 | Charles | 38 28 25 N | 077 02 34 W |
| Henson Valley Christian Church | Church | 80 | Prince George's | 38 46 37 N | 076 58 29 W |
| Hepbron | Populated Place | 20 | Kent | 39 18 16 N | 076 02 10 W |
| Herald Harbor | Populated Place | 16 | Anne Arundel | 39 03 13 N | 076 34 09 W |
| Herald Harbor Fire Company 6 | Building | | Anne Arundel | 39 02 59 N | 076 34 32 W |
| Herald Harbor Fire Department | Building | | Anne Arundel | 39 05 35 N | 076 57 44 W |
| Herald Harbor Park | Park | 17 | Anne Arundel | 39 03 13 N | 076 34 07 W |
| Heraldry Square | Populated Place | 134 | Baltimore | 39 19 25 N | 076 45 44 W |
| Herbert Hoover Middle School | School | 118 | Montgomery | 39 02 41 N | 077 10 44 W |
| Herbert Run | Stream | | Baltimore | 39 13 15 N | 076 41 17 W |
| Herbert Run | Stream | | Charles | 38 26 13 N | 076 56 26 W |
| Hereford | Populated Place | 208 | Baltimore | 39 35 20 N | 076 39 48 W |
| Hereford Baptist Church | Church | 207 | Baltimore | 39 35 25 N | 076 39 53 W |
| Hereford Branch Baltimore County Public Library | Building | 208 | Baltimore | 39 35 20 N | 076 39 48 W |
| Hereford High School | School | 192 | Baltimore | 39 35 56 N | 076 39 35 W |
| Hereford Medical Center | Hospital | 191 | Baltimore | 39 35 43 N | 076 39 43 W |
| Hereford Middle School | School | 156 | Baltimore | 39 34 40 N | 076 39 09 W |
| Hereford Plaza Shopping Center | Locale | | Baltimore | 39 35 24 N | 076 39 53 W |
| Hereford Shopping Center | Locale | 204 | Baltimore | 39 35 30 N | 076 40 12 W |
| Hereford United Methodist Church | Church | 207 | Baltimore | 39 35 21 N | 076 39 46 W |
| Hereford Volunteer Ambulance Association Station 53 | Building | | Baltimore | 39 59 08 N | 077 05 13 W |
| Hereford Volunteer Fire Company Station 44 | Building | | Baltimore | 39 59 32 N | 077 06 24 W |
| Heritage | Populated Place | 241 | Carroll | 39 26 53 N | 077 00 02 W |
| Heritage (subdivision) | Populated Place | 11 | Anne Arundel | 38 58 18 N | 076 31 02 W |
| Heritage Academy | School | 125 | Washington | 39 39 00 N | 077 49 43 W |
| Heritage Baptist Church | Church | 12 | Anne Arundel | 38 58 09 N | 076 31 09 W |
| Heritage Cemetery | Cemetery | 235 | Carroll | 39 31 38 N | 077 01 59 W |
| Heritage Center Shopping Center | Locale | 59 | Charles | 38 37 00 N | 076 53 29 W |
| Heritage Christian Church | Church | 155 | Montgomery | 39 06 20 N | 077 00 09 W |
| Heritage Estates | Populated Place | 119 | Harford | 39 35 45 N | 076 11 44 W |
| Heritage Estates | Populated Place | 146 | Washington | 39 33 02 N | 077 45 34 W |
| Heritage Farms | Populated Place | 174 | Howard | 39 20 10 N | 076 57 04 W |
| Heritage Harbour | Populated Place | 36 | Anne Arundel | 38 58 34 N | 076 35 24 W |
| Heritage Harbour Country Club | Locale | 18 | Anne Arundel | 38 58 49 N | 076 35 09 W |
| Heritage Harbour Site One Dam | Dam | 32 | Anne Arundel | 38 58 36 N | 076 35 29 W |
| Heritage Heights | Populated Place | 150 | Howard | 39 12 13 N | 076 56 28 W |
| Heritage Hill | Populated Place | 39 | Anne Arundel | 39 11 54 N | 076 37 30 W |
| Heritage Hills | Populated Place | 121 | Frederick | 39 17 55 N | 077 21 20 W |
| Heritage Hills | Populated Place | 42 | Prince George's | 38 52 25 N | 076 42 11 W |
| Heritage Manor | Populated Place | 14 | Wicomico | 38 19 19 N | 075 32 04 W |
| Heritage Mobile Home Park | Populated Place | 8 | Dorchester | 38 35 39 N | 075 56 02 W |
| Heritage Office Complex | Locale | 25 | Anne Arundel | 38 58 30 N | 076 33 40 W |
| Heritage United Church of Christ | Church | 103 | Baltimore (city) | 39 19 26 N | 076 40 08 W |
| Heritage Valley (subdivision) | Populated Place | 21 | Cecil | 39 35 40 N | 075 49 17 W |
| Heritage Woods | Populated Place | 111 | Harford | 39 33 20 N | 076 20 29 W |
| Heritage Woods | Populated Place | 91 | Howard | 39 09 30 N | 076 49 02 W |
| Heritage Woods (subdivision) | Populated Place | 21 | Cecil | 39 36 02 N | 075 48 59 W |
| Hermanville | Populated Place | 35 | St. Mary's | 38 14 49 N | 076 25 45 W |
| Hermanville Post Office (historical) | Post Office | 34 | St. Mary's | 38 14 53 N | 076 25 24 W |
| Hermit Island | Island | 32 | Montgomery | 38 58 25 N | 077 13 06 W |
| Hermitage Hill | Populated Place | 41 | Anne Arundel | 38 59 37 N | 076 39 09 W |
| Hermitage Park | Populated Place | 119 | Montgomery | 39 04 46 N | 077 03 50 W |
| Hermon Church | Church | 79 | Montgomery | 38 59 17 N | 077 10 27 W |
| Herndon Monument | Park | 6 | Anne Arundel | 38 58 56 N | 076 29 11 W |
| Hernwood | Populated Place | 156 | Baltimore | 39 22 17 N | 076 50 37 W |
| Hernwood Elementary School | School | 174 | Baltimore | 39 22 28 N | 076 49 52 W |
| Hernwood Heights | Populated Place | 191 | Baltimore | 39 22 46 N | 076 49 43 W |
| Hernwood Sanitary Landfill | Locale | 110 | Baltimore | 39 21 23 N | 076 51 54 W |
| Heron Island (historical) | Island | -5 | St. Mary's | 38 12 55 N | 076 43 19 W |
| Heron Island Bar | Bar | -8 | St. Mary's | 38 12 57 N | 076 43 28 W |
| Heron Lake | Lake | 5 | Anne Arundel | 38 57 12 N | 076 28 09 W |
| Heron Point (subdivision) | Populated Place | 7 | Kent | 39 13 13 N | 076 03 24 W |
| Herons Watch | Populated Place | 5 | Anne Arundel | 39 05 35 N | 076 27 39 W |
| Herring Bay | Bay | -6 | Anne Arundel | 38 45 10 N | 076 32 36 W |
| Herring Bay View | Locale | 6 | Anne Arundel | 38 45 33 N | 076 33 36 W |
| Herring Branch | Stream | | Harford | 39 22 35 N | 075 48 24 W |
| Herring Creek | Bay | -3 | St. Mary's | 38 10 49 N | 076 31 51 W |
| Herring Creek | Locale | 4 | St. Mary's | 38 11 28 N | 076 32 12 W |
| Herring Creek | Populated Place | 2 | St. Mary's | 38 11 10 N | 076 32 29 W |
| Herring Creek | Stream | | Cecil | 39 31 07 N | 075 52 27 W |
| Herring Creek | Stream | | Worcester | 38 21 23 N | 075 07 55 W |