Feature Name | Class | Elev. meters | County | Latitude DMS | Longitude DMS |
| Ivy Hill Cemetery | Cemetery | 70 | Prince George's | 39 06 22 N | 076 51 55 W |
| Ivy Hill Way | Populated Place | 247 | Carroll | 39 25 01 N | 077 02 50 W |
| Ivy Meadows | Populated Place | 152 | Baltimore | 39 26 10 N | 076 52 09 W |
| Ivytown | Populated Place | 20 | Talbot | 38 43 09 N | 076 02 31 W |
| Izaak Walton League Reservation | Park | 210 | Frederick | 39 24 59 N | 077 10 24 W |
| J C Parks Elementary School | School | 52 | Charles | 38 36 53 N | 077 04 30 W |
| J Frank Dent Elementary School | School | 76 | Prince George's | 38 48 36 N | 076 57 41 W |
| J M Towes Vocational School | School | 4 | Somerset | 38 07 29 N | 075 42 30 W |
| J P Ryon Elementary School | School | 62 | Charles | 38 37 20 N | 076 53 22 W |
| J.Millard Tawes College Center | Building | | Baltimore (city) | 39 18 41 N | 076 39 31 W |
| Ja-Mar | Locale | 18 | Caroline | 38 57 51 N | 075 53 24 W |
| Jabez Branch | Stream | | Anne Arundel | 39 04 54 N | 076 37 44 W |
| Jack Bay | Bay | -3 | Calvert | 38 26 14 N | 076 35 47 W |
| Jack Creek | Bay | 0 | Anne Arundel | 38 50 34 N | 076 29 40 W |
| Jack Creek Marsh | Swamp | 7 | Anne Arundel | 38 50 45 N | 076 30 37 W |
| Jack White Swamp | Swamp | 21 | Wicomico | 38 23 25 N | 075 26 36 W |
| Jacks Corner | Populated Place | 101 | Cecil | 39 38 29 N | 076 07 35 W |
| Jacks Cove | Bay | 2 | Anne Arundel | 39 00 32 N | 076 25 21 W |
| Jacks Cove | Bay | 2 | Kent | 39 19 39 N | 076 05 51 W |
| Jacks Cove | Bay | 3 | Talbot | 38 45 40 N | 076 06 05 W |
| Jacks Creek | Channel | 0 | Dorchester | 38 25 33 N | 076 15 33 W |
| Jacks Creek | Stream | | Dorchester | 38 21 10 N | 075 52 48 W |
| Jacks Creek | Stream | | Prince George's | 38 34 50 N | 076 41 14 W |
| Jacks Creek | Stream | | Talbot | 38 45 41 N | 076 06 19 W |
| Jacks Hole | Stream | | Harford | 39 41 17 N | 076 22 24 W |
| Jackson | Populated Place | 49 | Cecil | 39 34 57 N | 076 02 31 W |
| Jackson Branch | Stream | | Harford | 39 40 22 N | 076 32 07 W |
| Jackson Branch | Stream | | Wicomico | 38 25 59 N | 075 33 17 W |
| Jackson Cemetery | Cemetery | 37 | Anne Arundel | 39 06 32 N | 076 42 15 W |
| Jackson Creek | Bay | -12 | Queen Anne's | 38 58 12 N | 076 13 19 W |
| Jackson Elementary School | School | 184 | Baltimore | 39 30 49 N | 076 33 36 W |
| Jackson Grove | Populated Place | 42 | Anne Arundel | 39 06 14 N | 076 42 30 W |
| Jackson Hall School (historical) | School | 74 | Cecil | 39 41 10 N | 075 48 20 W |
| Jackson Island | Island | 0 | Somerset | 38 02 24 N | 075 49 48 W |
| Jackson Landing | Populated Place | 17 | Prince George's | 38 46 22 N | 076 42 36 W |
| Jackson Mill Farms | Populated Place | 99 | Cecil | 39 38 02 N | 076 01 59 W |
| Jackson Minilibrary Baltimore County Public Library | Building | 179 | Baltimore | 39 31 04 N | 076 33 33 W |
| Jackson Mountain | Summit | 650 | Allegany | 39 32 10 N | 078 59 37 W |
| Jackson Ridge | Populated Place | 178 | Baltimore | 39 31 20 N | 076 34 15 W |
| Jackson Road Elementary School | School | 118 | Montgomery | 39 03 23 N | 076 59 32 W |
| Jackson Run | Stream | | Allegany | 39 33 56 N | 078 58 45 W |
| Jackson Wharf | Locale | 0 | Baltimore (city) | 39 16 47 N | 076 35 43 W |
| Jacksons Corner | Populated Place | 2 | Anne Arundel | 38 54 10 N | 076 31 04 W |
| Jacksontown (historical) | Populated Place | 37 | Charles | 38 28 42 N | 077 13 23 W |
| Jacksonville | Populated Place | 178 | Baltimore | 39 31 05 N | 076 33 34 W |
| Jacksonville Volunteer Fire Company Station 47 | Building | | Baltimore | 39 51 47 N | 076 56 00 W |
| Jacktown | Populated Place | 7 | Dorchester | 38 33 07 N | 076 02 34 W |
| Jacob Tome School | School | 14 | Cecil | 39 35 37 N | 075 56 07 W |
| Jacobs Creek | Stream | | Kent | 39 22 15 N | 075 50 10 W |
| Jacobs Nose | Cape | 2 | Cecil | 39 27 31 N | 075 59 24 W |
| Jacobs Nose | Cape | 4 | Queen Anne's | 39 04 21 N | 076 05 28 W |
| Jacobs Point | Cape | 0 | Anne Arundel | 38 57 12 N | 076 34 19 W |
| Jacobs Run | Populated Place | 220 | Frederick | 39 23 18 N | 077 11 18 W |
| Jacobsville | Populated Place | 34 | Anne Arundel | 39 07 17 N | 076 31 03 W |
| Jacobsville Elementary School | School | 31 | Anne Arundel | 39 07 15 N | 076 31 31 W |
| Jacobsville Fire Station 10 | Building | | Anne Arundel | 39 07 26 N | 076 31 35 W |
| Jacobsville Fire Station Company 10 | Building | | Anne Arundel | 39 12 46 N | 076 52 53 W |
| Jacobsville Recreation Area | Park | 25 | Anne Arundel | 39 06 49 N | 076 31 09 W |
| Jadwins Creek | Stream | | Talbot | 38 50 09 N | 075 55 28 W |
| Jake Gut | Stream | | Worcester | 38 22 25 N | 075 08 39 W |
| Jamaica Point | Cape | 0 | Talbot | 38 36 40 N | 075 59 13 W |
| James | Populated Place | 1 | Dorchester | 38 35 08 N | 076 15 31 W |
| James Bennett High School | School | 11 | Wicomico | 38 20 48 N | 075 35 27 W |
| James Bennett Junior High School | School | 10 | Wicomico | 38 20 48 N | 075 35 42 W |
| James Cemetery | Cemetery | 6 | Kent | 39 11 09 N | 076 04 29 W |
| James Church | Church | 3 | Talbot | 38 45 26 N | 076 19 10 W |
| James Craik Elementary School | School | 58 | Charles | 38 34 13 N | 077 01 45 W |
| James Creek | Stream | | Montgomery | 39 10 24 N | 077 01 43 W |
| James Creek Bar | Bar | -3 | St. Mary's | 38 05 14 N | 076 22 49 W |
| James E Duckworth Special Education Center | School | 67 | Prince George's | 39 02 32 N | 076 56 14 W |
| James H Harrison Elementary School | School | 80 | Prince George's | 39 04 19 N | 076 51 44 W |
| James Hubert Blake High School | School | 130 | Montgomery | 39 06 51 N | 077 00 52 W |
| James Island | Island | 0 | Dorchester | 38 27 20 N | 076 14 32 W |
| James Island | Island | 0 | Dorchester | 38 31 01 N | 076 20 23 W |
| James Island (historical) | Island | -2 | Dorchester | 38 29 20 N | 076 20 09 W |
| James Madison Middle School | School | 66 | Prince George's | 38 47 18 N | 076 50 25 W |
| James McHenry Elementary School | School | 23 | Baltimore (city) | 39 17 13 N | 076 37 57 W |
| James McHenry Elementary School | School | 42 | Prince George's | 38 57 25 N | 076 51 05 W |
| James Monroe Public School (historical) | School | 47 | Baltimore (city) | 39 17 15 N | 076 38 44 W |
| James Mosher Elementary School | School | 62 | Baltimore (city) | 39 17 59 N | 076 39 22 W |
| James Point | Cape | -7 | Dorchester | 38 31 40 N | 076 20 37 W |
| James Pond | Bay | -2 | Anne Arundel | 39 05 39 N | 076 26 09 W |
| James Rumsey Bridge | Bridge | 85 | Washington | 39 26 11 N | 077 48 05 W |
| James Run | Stream | | Charles | 38 29 12 N | 076 55 41 W |
| James Run | Stream | | Harford | 39 28 18 N | 076 15 35 W |
| James Ryder Randall Elementary School | School | 73 | Prince George's | 38 46 58 N | 076 54 50 W |
| James Senate Office Building | Building | | Anne Arundel | 38 58 45 N | 076 29 34 W |
| James W Henderson Park | Park | 30 | St. Mary's | 38 14 45 N | 076 29 04 W |
| James Weldon Johnson Auditorium Building | Building | | Baltimore (city) | 39 18 36 N | 076 39 31 W |
| Jameson Dam | Dam | 48 | Charles | 38 30 48 N | 076 48 29 W |
| Jameson Reservoir | Reservoir | 48 | Charles | 38 30 48 N | 076 48 29 W |
| Jamesway Shopping Center | Locale | 57 | Harford | 39 31 12 N | 076 11 22 W |
| Jamison Yard | Locale | 181 | Washington | 39 38 15 N | 077 45 18 W |
| Jamisons School (historical) | School | 25 | Cecil | 39 26 16 N | 075 54 30 W |
| Jane Addams Vocational School | School | 40 | Baltimore (city) | 39 18 55 N | 076 37 02 W |
| Jane Berrys Run | Stream | | Charles | 38 30 41 N | 077 09 02 W |
| Janes Island | Island | 0 | Somerset | 38 00 10 N | 075 51 44 W |
| Janes Island Gut | Gut | 0 | Somerset | 37 58 55 N | 075 52 34 W |
| Janes Island Light | Locale | -3 | Somerset | 37 57 47 N | 075 55 05 W |
| Janes Island State Park | Park | 0 | Somerset | 38 00 59 N | 075 51 27 W |
| Janes Point | Cape | 0 | Calvert | 38 19 22 N | 076 27 24 W |
| Janes United Methodist Church | Church | 5 | Kent | 39 12 23 N | 076 03 55 W |
| Janwood | Populated Place | 200 | Montgomery | 39 16 35 N | 077 10 10 W |
| Jarboesville Park | Park | 27 | St. Mary's | 38 15 28 N | 076 27 26 W |
| Jarboesville Run | Stream | | St. Mary's | 38 15 10 N | 076 30 27 W |
| Jarmans Branch | Stream | | Queen Anne's | 38 59 26 N | 075 55 47 W |
| Jarrett Creek | Stream | | Kent | 39 07 59 N | 076 05 18 W |
| Jarrettsville | Populated Place | 204 | Harford | 39 36 16 N | 076 28 40 W |
| Jarrettsville Cemetery | Cemetery | 197 | Harford | 39 36 30 N | 076 28 39 W |
| Jarrettsville Elementary School | School | 216 | Harford | 39 36 08 N | 076 29 12 W |