Feature Name | Class | Elev. meters | County | Latitude DMS | Longitude DMS |
| Hyattsville Hills | Populated Place | 27 | Prince George's | 38 57 38 N | 076 57 04 W |
| Hyattsville Historic District | Park | 17 | Prince George's | 38 57 13 N | 076 56 26 W |
| Hyattsville Mennonite Church | Church | 29 | Prince George's | 38 57 57 N | 076 56 41 W |
| Hyattsville Middle School | School | 40 | Prince George's | 38 57 35 N | 076 56 45 W |
| Hyattsville Police Department | Building | | Prince George's | 39 35 26 N | 077 34 28 W |
| Hyattsville Presbyterian Church | Church | 27 | Prince George's | 38 57 49 N | 076 57 49 W |
| Hyattsville Volunteer Fire Department Company 1 | Building | | Prince George's | 39 36 39 N | 077 35 26 W |
| Hybarc Farm Airport | Airport | 14 | Queen Anne's | 39 12 11 N | 076 01 30 W |
| Hyde Field | Park | 73 | Prince George's | 38 44 56 N | 076 56 01 W |
| Hyde Park | Populated Place | 4 | Baltimore | 39 17 15 N | 076 26 27 W |
| Hyde Park (subdivision) | Populated Place | 183 | Washington | 39 40 13 N | 077 43 39 W |
| Hyde Park (subdivision) | Populated Place | 8 | Wicomico | 38 22 56 N | 075 35 41 W |
| Hyde Park Elementary School | School | 6 | Baltimore | 39 17 37 N | 076 26 24 W |
| Hyde Park Trailer Park | Populated Place | 18 | Talbot | 38 48 58 N | 076 03 20 W |
| Hyde Park Volunteer Fire Department Station 25 | Building | | Baltimore | 39 17 06 N | 076 26 25 W |
| Hydes | Populated Place | 100 | Baltimore | 39 29 02 N | 076 29 36 W |
| Hydes Post Office | Post Office | 101 | Baltimore | 39 29 03 N | 076 29 39 W |
| Hydes Quarry | Mine | 157 | Carroll | 39 33 54 N | 077 04 22 W |
| Hylands Point | Cape | 1 | Cecil | 39 30 17 N | 075 55 39 W |
| Hynesboro | Populated Place | 47 | Prince George's | 38 58 18 N | 076 51 36 W |
| Hynson | Populated Place | 13 | Caroline | 38 42 11 N | 075 51 30 W |
| Hyser Estates | Populated Place | 143 | Carroll | 39 41 46 N | 077 11 49 W |
| I-97 Business Park | Locale | | Anne Arundel | 39 05 40 N | 076 37 51 W |
| Ibm Heliport | Airport | 129 | Montgomery | 39 09 12 N | 077 13 00 W |
| Icehouse Branch | Stream | | Worcester | 38 14 02 N | 075 15 32 W |
| Idlewild (subdivision) | Populated Place | 34 | Prince George's | 38 59 15 N | 076 43 34 W |
| Idlewild (subdivision) | Populated Place | 12 | Talbot | 38 45 50 N | 076 03 46 W |
| Idlewild Park | Park | 9 | Talbot | 38 45 48 N | 076 04 19 W |
| Idlewilde | Populated Place | 0 | Anne Arundel | 38 51 00 N | 076 29 46 W |
| Idlewood | Populated Place | 118 | Baltimore (city) | 39 22 12 N | 076 35 21 W |
| Idlewood Acres | Populated Place | 3 | Charles | 38 18 52 N | 076 53 10 W |
| Idlewood Trailer Park | Populated Place | 61 | Charles | 38 38 04 N | 076 52 42 W |
| Idlewylde | Populated Place | 120 | Baltimore | 39 22 31 N | 076 35 23 W |
| Idlewylde United Methodist Church | Church | 123 | Baltimore | 39 22 34 N | 076 35 32 W |
| Idylwild State Wildlife Management Area | Park | 9 | Caroline | 38 43 37 N | 075 45 02 W |
| Iglehart | Populated Place | 42 | Anne Arundel | 39 00 42 N | 076 34 03 W |
| Iglehart Hall | Building | | Anne Arundel | 38 58 58 N | 076 29 30 W |
| Iglesia Alianza Derwood Church | Church | 136 | Montgomery | 39 07 32 N | 077 09 04 W |
| Ijamsville | Populated Place | 105 | Frederick | 39 21 37 N | 077 19 22 W |
| Ijamsville Cemetery | Cemetery | 130 | Frederick | 39 21 48 N | 077 19 18 W |
| Ijamsville Heights | Populated Place | 132 | Frederick | 39 21 11 N | 077 19 14 W |
| Ijamsville Post Office | Post Office | 121 | Frederick | 39 21 45 N | 077 19 21 W |
| Ijamsville United Methodist Church | Church | 130 | Frederick | 39 21 48 N | 077 19 18 W |
| Ilchester | Populated Place | 50 | Howard | 39 15 03 N | 076 45 53 W |
| Ilchester Elementary School | School | 147 | Howard | 39 13 53 N | 076 46 25 W |
| Immaculate Conception Catholic Church | Church | 19 | Caroline | 39 06 52 N | 075 44 57 W |
| Immaculate Conception Catholic Church | Church | 49 | St. Mary's | 38 26 33 N | 076 44 51 W |
| Immaculate Conception Cemetery | Cemetery | 68 | Cecil | 39 39 26 N | 075 51 17 W |
| Immaculate Conception Convent | Church | 12 | Cecil | 39 36 52 N | 075 49 54 W |
| Immaculate Conception Roman Catholic Church | Church | 152 | Baltimore | 39 24 15 N | 076 36 26 W |
| Immaculate Conception Roman Catholic Church | Church | 9 | Cecil | 39 36 28 N | 075 50 02 W |
| Immaculate Conception Roman Catholic Church | Church | 493 | Garrett | 39 23 17 N | 079 10 55 W |
| Immaculate Conception School | Church | 12 | Cecil | 39 36 53 N | 075 49 52 W |
| Immaculate Conception School | School | 148 | Baltimore | 39 24 14 N | 076 36 22 W |
| Immaculate Heart of Mary Church | Church | 33 | St. Mary's | 38 16 50 N | 076 28 21 W |
| Immaculate Heart of Mary Roman Catholic Church | Church | 126 | Baltimore | 39 23 33 N | 076 33 50 W |
| Immaculate Heart of Mary School | School | 125 | Baltimore | 39 23 31 N | 076 33 48 W |
| Immanual Church | Church | 12 | Talbot | 38 44 47 N | 076 03 59 W |
| Immanuel Baptist Church | Church | 25 | Baltimore (city) | 39 19 23 N | 076 32 29 W |
| Immanuel Cemetery | Cemetery | 61 | Prince George's | 38 39 06 N | 076 46 17 W |
| Immanuel Church | Church | 126 | Baltimore | 39 33 15 N | 076 37 35 W |
| Immanuel Church | Church | 24 | Cecil | 39 34 51 N | 075 49 34 W |
| Immanuel Church | Church | 61 | Prince George's | 38 39 05 N | 076 46 19 W |
| Immanuel Church | Church | 12 | Wicomico | 38 22 20 N | 075 33 57 W |
| Immanuel Evangelical Lutheran Church | Church | 107 | Baltimore (city) | 39 21 36 N | 076 35 16 W |
| Immanuel Evangelical Lutheran Church | Church | 13 | Talbot | 38 52 37 N | 075 59 47 W |
| Immanuel Lutheran Church | Church | 13 | Caroline | 38 42 31 N | 075 54 22 W |
| Immanuel Lutheran Church | Church | 299 | Carroll | 39 39 40 N | 076 52 59 W |
| Immanuel of Brooklyn United Methodist Church | Church | 21 | Baltimore (city) | 39 14 16 N | 076 36 10 W |
| Immanuel United Methodist Church | Church | 5 | Queen Anne's | 38 57 31 N | 076 12 14 W |
| Immanuel United Methodist Church | Church | 1 | Somerset | 37 58 57 N | 075 51 01 W |
| Imperial Gardens | Populated Place | 158 | Baltimore | 39 22 33 N | 076 46 39 W |
| Inclsey Manor | Locale | 28 | St. Mary's | 38 15 10 N | 076 29 44 W |
| Independence School (historical) | School | 155 | Washington | 39 40 28 N | 077 50 12 W |
| Independence Village | Populated Place | 49 | Charles | 38 30 13 N | 076 48 11 W |
| Independent Baptist Church | Church | 22 | Baltimore (city) | 39 13 41 N | 076 36 15 W |
| Independent Gospel Church | Church | 7 | Anne Arundel | 39 10 03 N | 076 32 10 W |
| Independent Hose Company Number 1 | Building | | Frederick | 39 43 11 N | 077 43 38 W |
| Indian Acres | Populated Place | 18 | Cecil | 39 23 14 N | 075 54 54 W |
| Indian Branch | Stream | | Charles | 38 30 44 N | 076 43 59 W |
| Indian Cabin Creek | Stream | | Kent | 39 22 10 N | 076 06 45 W |
| Indian Cabin Fishery | Locale | 0 | Cecil | 39 27 05 N | 075 59 60 W |
| Indian Creek | Bay | 5 | Anne Arundel | 39 04 35 N | 076 36 18 W |
| Indian Creek | Bay | 4 | Dorchester | 38 35 06 N | 075 58 39 W |
| Indian Creek | Gut | 2 | Somerset | 37 58 47 N | 076 01 22 W |
| Indian Creek | Stream | | Charles | 38 29 56 N | 076 40 45 W |
| Indian Creek | Stream | | Prince George's | 38 58 44 N | 076 55 00 W |
| Indian Creek Branch | Stream | | Anne Arundel | 39 04 34 N | 076 36 23 W |
| Indian Creek Estates | Populated Place | 29 | Anne Arundel | 39 03 45 N | 076 36 36 W |
| Indian Creek Estates | Populated Place | 43 | Charles | 38 30 50 N | 076 42 27 W |
| Indian Creek Park | Park | 16 | Prince George's | 38 59 14 N | 076 55 06 W |
| Indian Creek School | School | 26 | Anne Arundel | 39 03 46 N | 076 36 23 W |
| Indian Falls | Populated Place | 25 | Cecil | 39 36 56 N | 075 55 54 W |
| Indian Hammock | Populated Place | 1 | Somerset | 37 59 47 N | 075 46 11 W |
| Indian Hammock Cove | Bay | -3 | Somerset | 37 58 26 N | 075 44 52 W |
| Indian Harbor | Populated Place | 2 | Talbot | 38 45 05 N | 076 16 58 W |
| Indian Head | Cliff | 4 | Charles | 38 36 18 N | 077 10 32 W |
| Indian Head | Populated Place | 32 | Charles | 38 36 00 N | 077 09 44 W |
| Indian Head Baptist Church | Church | 28 | Charles | 38 35 52 N | 077 09 57 W |
| Indian Head Church of the Nazarene | Church | 30 | Charles | 38 35 50 N | 077 09 55 W |
| Indian Head Manor | Populated Place | 56 | Charles | 38 37 58 N | 077 03 39 W |
| Indian Head Post Office | Post Office | 34 | Charles | 38 35 57 N | 077 09 54 W |
| Indian Head School | School | 38 | Charles | 38 36 06 N | 077 09 52 W |
| Indian Head Shopping Center | Locale | 10 | Charles | 38 36 00 N | 077 09 12 W |
| Indian Head Town Hall | Building | 36 | Charles | 38 35 57 N | 077 09 51 W |
| Indian Head United Methodist Church | Church | 28 | Charles | 38 35 50 N | 077 10 06 W |
| Indian Head Volunteer Fire Department and Rescue Squad Station 9 | Building | | Charles | 39 00 32 N | 077 17 03 W |
| Indian Hill | Populated Place | 184 | Howard | 39 20 03 N | 076 56 48 W |
| Indian Hills | Populated Place | 17 | Anne Arundel | 39 01 15 N | 076 29 34 W |
| Indian Hills | Populated Place | 153 | Harford | 39 40 48 N | 076 30 38 W |