Feature Name | Class | Elev. meters | County | Latitude DMS | Longitude DMS |
| Furnace Branch | Stream | | Worcester | 38 13 21 N | 075 28 26 W |
| Furnace Creek | Bay | 2 | Anne Arundel | 39 11 12 N | 076 34 51 W |
| Furnace Ford | Populated Place | 68 | Frederick | 39 14 35 N | 077 26 22 W |
| Furnace Hills (subdivision) | Populated Place | 210 | Carroll | 39 34 35 N | 077 00 59 W |
| G Gardner Shugart Middle School | School | 81 | Prince George's | 38 50 02 N | 076 58 05 W |
| G James Gholson Middle School | School | 61 | Prince George's | 38 54 12 N | 076 52 23 W |
| Gaines Church | Church | 76 | Howard | 39 12 38 N | 076 43 54 W |
| Gaither | Populated Place | 131 | Carroll | 39 21 41 N | 076 59 35 W |
| Gaither Farm Estates | Populated Place | 151 | Howard | 39 14 16 N | 076 53 48 W |
| Gaither Heights | Populated Place | 171 | Carroll | 39 22 00 N | 076 59 43 W |
| Gaither Manor | Populated Place | 179 | Carroll | 39 22 21 N | 076 59 29 W |
| Gaither Post Office | Post Office | 136 | Carroll | 39 21 44 N | 076 59 32 W |
| Gaither United Methodist Church | Church | 137 | Carroll | 39 21 44 N | 076 59 34 W |
| Gaithersburg | Populated Place | 155 | Montgomery | 39 08 36 N | 077 12 05 W |
| Gaithersburg Church of God | Church | 158 | Montgomery | 39 08 40 N | 077 10 24 W |
| Gaithersburg Elementary School | School | 160 | Montgomery | 39 08 37 N | 077 11 32 W |
| Gaithersburg High School | School | 157 | Montgomery | 39 08 05 N | 077 11 44 W |
| Gaithersburg Library | Building | 133 | Montgomery | 39 09 26 N | 077 12 20 W |
| Gaithersburg Mennonite Church | Church | 145 | Montgomery | 39 08 15 N | 077 12 03 W |
| Gaithersburg Middle School | School | 160 | Montgomery | 39 08 37 N | 077 11 17 W |
| Gaithersburg Police Station | Building | 160 | Montgomery | 39 08 25 N | 077 11 29 W |
| Gaithersburg Post Office | Post Office | 153 | Montgomery | 39 08 28 N | 077 10 36 W |
| Gaithersburg Presbyterian Church | Church | 147 | Montgomery | 39 07 43 N | 077 11 11 W |
| Gaithersburg Public Works | Locale | 118 | Montgomery | 39 08 25 N | 077 13 59 W |
| Gaithersburg Railroad Station | Building | 156 | Montgomery | 39 08 30 N | 077 11 36 W |
| Gaithersburg Regional Library | Building | 134 | Montgomery | 39 09 27 N | 077 12 20 W |
| Gaithersburg Square Shopping Center | Locale | 136 | Montgomery | 39 08 53 N | 077 12 34 W |
| Gaithersburg-Washington Grove Fire Department Fire Station 8 | Building | | Montgomery | 39 01 30 N | 077 04 21 W |
| Gaithersburg-Washington Grove Fire Station Company 28 | Building | 144 | Montgomery | 39 08 52 N | 077 08 49 W |
| Gale-Bailey Elementary School | School | 45 | Charles | 38 33 39 N | 077 09 02 W |
| Galena | Populated Place | 21 | Kent | 39 20 26 N | 075 52 44 W |
| Galena Middle School | School | 21 | Kent | 39 20 19 N | 075 52 42 W |
| Galena Post Office | Post Office | 22 | Kent | 39 20 31 N | 075 52 44 W |
| Galena Town Hall | Building | 22 | Kent | 39 20 25 N | 075 52 42 W |
| Galena Volunteer Fire Company | Building | | Kent | 39 34 11 N | 076 28 25 W |
| Gales Creek | Stream | | Anne Arundel | 38 49 19 N | 076 33 05 W |
| Gales Creek | Stream | | Dorchester | 38 33 25 N | 075 42 35 W |
| Gales Creek | Stream | | Somerset | 38 04 29 N | 075 46 45 W |
| Gales Wharf | Locale | 2 | Kent | 39 17 43 N | 076 10 12 W |
| Galestown | Populated Place | 4 | Dorchester | 38 33 58 N | 075 42 54 W |
| Galestown Millpond | Reservoir | 2 | Dorchester | 38 34 03 N | 075 42 50 W |
| Galestown Millpond Dam | Dam | 2 | Dorchester | 38 34 06 N | 075 42 53 W |
| Galestown United Methodist Church | Church | 3 | Dorchester | 38 33 57 N | 075 42 49 W |
| Galesville | Populated Place | 2 | Anne Arundel | 38 50 35 N | 076 32 37 W |
| Galesville Estates | Populated Place | 2 | Anne Arundel | 38 50 37 N | 076 33 04 W |
| Galesville Post Office | Post Office | 0 | Anne Arundel | 38 50 38 N | 076 32 39 W |
| Galesville United Methodist Church | Church | 1 | Anne Arundel | 38 50 33 N | 076 32 36 W |
| Galesville Volunteer Fire Company 1 | Building | | Anne Arundel | 39 24 47 N | 076 54 47 W |
| Galilee Cemetery | Cemetery | 45 | St. Mary's | 38 23 31 N | 076 39 53 W |
| Galilee Church | Church | 6 | Baltimore | 39 16 56 N | 076 29 29 W |
| Galilee Church | Church | 45 | St. Mary's | 38 23 30 N | 076 39 53 W |
| Galilee Lutheran Church | Church | 15 | Anne Arundel | 39 06 21 N | 076 28 35 W |
| Galilee Lutheran Church | Church | 2 | Queen Anne's | 38 58 21 N | 076 17 29 W |
| Gallagher Estates | Populated Place | 161 | Frederick | 39 25 53 N | 077 11 30 W |
| Gallagher House | Building | | Baltimore | 39 24 29 N | 076 35 29 W |
| Gallagher Park | Populated Place | 101 | Baltimore (city) | 39 21 18 N | 076 36 48 W |
| Gallant Acres | Populated Place | 58 | Charles | 38 35 15 N | 076 48 27 W |
| Gallant Green | Locale | 60 | Charles | 38 35 38 N | 076 47 34 W |
| Gallant Green Woods | Populated Place | 56 | Charles | 38 35 07 N | 076 46 29 W |
| Galleria Shopping Center | Locale | | Baltimore | 39 25 10 N | 076 36 55 W |
| Gallions Corner | Populated Place | 120 | Harford | 39 39 11 N | 076 14 09 W |
| Galloway Creek | Stream | | Anne Arundel | 38 48 01 N | 076 42 30 W |
| Galloway Creek | Stream | | Baltimore | 39 18 06 N | 076 23 17 W |
| Galloway Point | Cape | 3 | Baltimore | 39 18 35 N | 076 24 01 W |
| Galloway Run | Stream | | Talbot | 38 47 32 N | 076 01 23 W |
| Galt | Populated Place | 161 | Carroll | 39 41 20 N | 077 08 20 W |
| Galway Elementary School | School | 103 | Montgomery | 39 03 52 N | 076 56 46 W |
| Galway Park | Park | 102 | Montgomery | 39 03 55 N | 076 56 45 W |
| Gambage Island | Island | 0 | Worcester | 38 21 49 N | 075 07 40 W |
| Gamber | Populated Place | 194 | Carroll | 39 27 53 N | 076 56 02 W |
| Gamble Farm Airport | Airport | 50 | Charles | 38 31 42 N | 077 04 03 W |
| Gamble House | Building | | Baltimore | 39 24 26 N | 076 35 29 W |
| Gambrill Cove | Bay | 0 | Anne Arundel | 39 09 57 N | 076 32 23 W |
| Gambrill Gymnasium | Building | | Frederick | 39 42 33 N | 077 42 39 W |
| Gambrill South | Populated Place | 239 | Frederick | 39 28 00 N | 077 30 59 W |
| Gambrill State Park | Park | 468 | Frederick | 39 28 43 N | 077 29 29 W |
| Gambrills | Populated Place | 47 | Anne Arundel | 39 04 01 N | 076 39 55 W |
| Gambrills Athletic Club | Locale | 42 | Anne Arundel | 39 03 20 N | 076 39 44 W |
| Gambrills Mill (historical) | Locale | 74 | Frederick | 39 22 07 N | 077 23 14 W |
| Gambrills Post Office | Post Office | 48 | Anne Arundel | 39 04 05 N | 076 40 08 W |
| Ganey Wharf | Locale | 1 | Caroline | 38 48 16 N | 075 54 35 W |
| Gannon | Populated Place | 319 | Allegany | 39 30 33 N | 079 02 33 W |
| Gap Falls | Falls | 613 | Garrett | 39 35 25 N | 079 25 37 W |
| Gap Hill | Summit | 838 | Garrett | 39 34 47 N | 079 24 31 W |
| Gap Point | Cape | 0 | Somerset | 37 57 20 N | 075 48 15 W |
| Gap Run | Stream | | Garrett | 39 35 25 N | 079 25 25 W |
| Gapgalleon | Populated Place | 49 | Anne Arundel | 39 12 45 N | 076 39 29 W |
| Gapland | Populated Place | 189 | Washington | 39 24 10 N | 077 39 37 W |
| Gapland Post Office | Post Office | 204 | Washington | 39 24 21 N | 077 39 37 W |
| Gapview Farm | Locale | 148 | Frederick | 39 19 38 N | 077 32 24 W |
| Garden Estates | Populated Place | 36 | Charles | 38 31 18 N | 077 06 17 W |
| Garden Estates (subdivision) | Populated Place | 5 | Dorchester | 38 34 55 N | 076 05 47 W |
| Garden Village Park | Populated Place | 30 | Baltimore | 39 19 45 N | 076 31 40 W |
| Gardens of Eternal Hope Cemetery | Cemetery | 213 | Carroll | 39 30 06 N | 076 56 14 W |
| Gardens of Faith Cemetery | Cemetery | 39 | Baltimore | 39 21 20 N | 076 30 28 W |
| Gardenspot | Populated Place | 183 | Washington | 39 41 17 N | 077 45 09 W |
| Gardenvillage Park | Park | 23 | Baltimore | 39 19 34 N | 076 31 39 W |
| Gardenville | Populated Place | 57 | Baltimore (city) | 39 19 51 N | 076 33 40 W |
| Gardenville Branch Enoch Pratt Free Library | Building | 59 | Baltimore (city) | 39 20 19 N | 076 32 60 W |
| Gardenville School | School | 63 | Baltimore (city) | 39 20 17 N | 076 33 07 W |
| Gardenville Swim Club | Locale | 23 | Baltimore (city) | 39 20 01 N | 076 32 16 W |
| Gardner Cemetery | Cemetery | 60 | Howard | 39 09 08 N | 076 46 42 W |
| Garey Mill Pond Branch | Stream | | Caroline | 38 54 55 N | 075 47 11 W |
| Gareys (historical) | Populated Place | 13 | Caroline | 38 55 15 N | 075 45 20 W |
| Garfield | Populated Place | 444 | Frederick | 39 36 14 N | 077 31 19 W |
| Garfield Cemetery | Cemetery | 473 | Frederick | 39 36 28 N | 077 31 12 W |
| Garfield Manor | Populated Place | 163 | Montgomery | 39 14 35 N | 077 10 55 W |
| Garfield United Methodist Church | Church | 471 | Frederick | 39 36 27 N | 077 31 11 W |
| Garland | Populated Place | 29 | Anne Arundel | 39 11 12 N | 076 38 18 W |
| Garland | Populated Place | 128 | Harford | 39 35 21 N | 076 10 22 W |