Feature Name | Class | Elev. meters | County | Latitude DMS | Longitude DMS |
| Jonathans Delight | Populated Place | 185 | Baltimore | 39 29 08 N | 076 42 24 W |
| Jones | Locale | 10 | Worcester | 38 21 55 N | 075 12 01 W |
| Jones | Populated Place | 18 | Anne Arundel | 39 03 22 N | 076 31 45 W |
| Jones | Populated Place | 140 | Frederick | 39 39 35 N | 077 21 12 W |
| Jones Chapel (historical) | Church | 31 | Cecil | 39 35 36 N | 075 51 52 W |
| Jones Chapel (historical) | Church | 151 | Washington | 39 38 02 N | 077 49 12 W |
| Jones Corner | Locale | 17 | Caroline | 38 46 45 N | 075 48 55 W |
| Jones Creek | Bay | -3 | Somerset | 38 01 55 N | 075 49 38 W |
| Jones Creek | Bay | 0 | Somerset | 37 59 04 N | 076 00 08 W |
| Jones Creek | Stream | | Baltimore | 39 13 11 N | 076 27 33 W |
| Jones Creek | Stream | | Cecil | 39 31 06 N | 075 54 57 W |
| Jones Creek | Stream | | Somerset | 38 10 51 N | 075 41 50 W |
| Jones Creek | Stream | | Wicomico | 38 14 29 N | 075 54 19 W |
| Jones Ditch | Canal | 4 | Worcester | 38 04 58 N | 075 26 58 W |
| Jones Elementary School | School | 27 | Anne Arundel | 39 03 28 N | 076 32 10 W |
| Jones Falls | Stream | | Baltimore (city) | 39 18 33 N | 076 37 10 W |
| Jones Falls Park | Park | 79 | Baltimore | 39 22 50 N | 076 38 36 W |
| Jones Hole | Locale | 2 | Queen Anne's | 38 55 18 N | 076 19 05 W |
| Jones Island | Island | 0 | Somerset | 38 05 09 N | 076 02 31 W |
| Jones Lake Dam | Dam | 4 | Queen Anne's | 39 14 48 N | 075 49 05 W |
| Jones Landing | Locale | 3 | Queen Anne's | 39 15 33 N | 075 51 15 W |
| Jones Lane Elementary School | School | 114 | Montgomery | 39 06 15 N | 077 15 58 W |
| Jones Point | Cape | 0 | Calvert | 38 41 20 N | 076 41 40 W |
| Jones Pond (historical) | Reservoir | 10 | Wicomico | 38 21 29 N | 075 31 58 W |
| Jones Station Fire Company 23 | Building | | Anne Arundel | 39 03 21 N | 076 31 39 W |
| Jones Tabernacle Baptist Church | Church | 11 | Baltimore (city) | 39 17 01 N | 076 37 35 W |
| Jones Valley | Populated Place | 109 | Baltimore | 39 22 59 N | 076 39 53 W |
| Jones View | Populated Place | 43 | Charles | 38 33 46 N | 077 07 34 W |
| Jonestown | Populated Place | 15 | Caroline | 38 43 46 N | 075 53 29 W |
| Jonestown | Populated Place | 153 | Howard | 39 13 19 N | 076 48 27 W |
| Jonestown | Populated Place | 33 | St. Mary's | 38 15 22 N | 076 26 20 W |
| Jonestown Community Park | Park | 15 | Caroline | 38 43 48 N | 075 53 29 W |
| Jonesville | Populated Place | 123 | Montgomery | 39 09 27 N | 077 23 50 W |
| Joppa | Populated Place | 44 | Harford | 39 26 01 N | 076 21 28 W |
| Joppa - Magnolia Volunteer Fire Company | Building | | Harford | 39 44 21 N | 076 35 08 W |
| Joppa Acres | Populated Place | 51 | Harford | 39 27 00 N | 076 21 48 W |
| Joppa Branch Harford County Library | Building | 2 | Harford | 39 24 43 N | 076 21 20 W |
| Joppa Cemetery | Cemetery | 0 | Dorchester | 38 30 28 N | 076 13 11 W |
| Joppa Corners Shopping Center | Locale | 74 | Baltimore | 39 23 52 N | 076 29 09 W |
| Joppa Heights | Populated Place | 136 | Baltimore | 39 24 07 N | 076 32 46 W |
| Joppa Hills | Populated Place | 105 | Harford | 39 30 33 N | 076 22 16 W |
| Joppa Landing | Populated Place | 25 | Harford | 39 24 10 N | 076 20 21 W |
| Joppa Manor | Populated Place | 118 | Baltimore | 39 23 48 N | 076 31 54 W |
| Joppa Methodist Church | Church | 0 | Dorchester | 38 30 29 N | 076 13 13 W |
| Joppa Post Office | Post Office | 2 | Harford | 39 24 44 N | 076 21 16 W |
| Joppa Vale | Populated Place | 31 | Baltimore | 39 23 38 N | 076 28 07 W |
| Joppa View | Populated Place | 63 | Baltimore | 39 24 10 N | 076 28 15 W |
| Joppa View Elementary School | School | 41 | Baltimore | 39 23 14 N | 076 27 19 W |
| Joppatowne | Populated Place | 74 | Harford | 39 27 28 N | 076 21 19 W |
| Joppatowne Christian Church | Church | 31 | Harford | 39 24 37 N | 076 20 12 W |
| Joppatowne Elementary School | School | 19 | Harford | 39 25 13 N | 076 21 42 W |
| Joppatowne High School | School | 5 | Harford | 39 24 52 N | 076 21 05 W |
| Joppatowne Plaza Shopping Center | Locale | 5 | Harford | 39 25 15 N | 076 22 18 W |
| Jordan Landing | Locale | 0 | Queen Anne's | 39 07 57 N | 076 03 06 W |
| Jordan Mill Farms | Populated Place | 227 | Baltimore | 39 41 13 N | 076 36 31 W |
| Jordan Swamp | Swamp | 34 | Charles | 38 35 43 N | 076 50 60 W |
| Josenhans | Populated Place | 12 | Baltimore | 39 18 58 N | 076 26 56 W |
| Joseph C Briscoe School | School | 33 | Baltimore (city) | 39 17 52 N | 076 37 33 W |
| Joseph Harrison Lockerman Public School (historical) | School | 49 | Baltimore (city) | 39 17 30 N | 076 38 38 W |
| Joseph Henry Apple Library | Building | 99 | Frederick | 39 25 17 N | 077 25 11 W |
| Joseph Lee Park | Park | 24 | Baltimore (city) | 39 17 30 N | 076 32 29 W |
| Joseph Lee Recreation Center | Park | 37 | Baltimore (city) | 39 17 27 N | 076 32 38 W |
| Joseph Meadows | Populated Place | 167 | Carroll | 39 37 12 N | 077 06 35 W |
| Joseph Square Shopping Center | Locale | 150 | Howard | 39 13 19 N | 076 53 22 W |
| Josh Point | Cape | 2 | St. Mary's | 38 09 12 N | 076 28 09 W |
| Joshua Chapel United Methodist Church | Church | 20 | Kent | 39 15 13 N | 075 59 60 W |
| Joshua Thomas Chapel | Church | 1 | Somerset | 38 09 18 N | 075 56 44 W |
| Joy Chapel Cemetery | Cemetery | 30 | St. Mary's | 38 20 17 N | 076 32 44 W |
| Joy Chapel Methodist Church (historical) | Church | 32 | St. Mary's | 38 20 19 N | 076 32 42 W |
| Joy Harbor | Bay | 0 | Anne Arundel | 39 08 45 N | 076 32 47 W |
| Joy Haven | Populated Place | 49 | Cecil | 39 30 39 N | 075 57 09 W |
| Joy Lee Acres | Populated Place | 31 | Calvert | 38 36 45 N | 076 35 34 W |
| Joyce | Populated Place | 26 | Anne Arundel | 39 01 29 N | 076 31 12 W |
| Joyce Acres | Populated Place | 28 | Anne Arundel | 39 02 18 N | 076 30 14 W |
| Joyces Marina | Locale | 2 | Anne Arundel | 39 02 43 N | 076 34 14 W |
| Jubb Cove | Bay | 0 | Anne Arundel | 39 07 23 N | 076 27 37 W |
| Jubilee Farm | Locale | 2 | St. Mary's | 38 12 26 N | 076 34 24 W |
| Judge Point | Cape | 1 | Cecil | 39 22 03 N | 075 51 19 W |
| Judge Sylvania W Woods Sr Elementary School | School | 44 | Prince George's | 38 55 53 N | 076 52 14 W |
| Judith A Resnick Elementary School | School | 174 | Montgomery | 39 10 54 N | 077 09 05 W |
| Judys Point | Cape | 1 | Talbot | 38 44 27 N | 076 16 43 W |
| Jug Bay | Bay | -3 | Anne Arundel | 38 46 06 N | 076 41 55 W |
| Jug Bay Wetlands Sanctuary | Park | 0 | Anne Arundel | 38 46 47 N | 076 42 30 W |
| Jug Bridge | Bridge | 69 | Frederick | 39 23 54 N | 077 22 01 W |
| Juggling Creek | Gut | 0 | Somerset | 37 58 18 N | 076 00 35 W |
| Jugtown | Populated Place | 234 | Washington | 39 36 45 N | 077 35 38 W |
| Julia A Purnell Museum | Building | 1 | Worcester | 38 10 31 N | 075 23 49 W |
| Julia Brown Montessori School | School | 118 | Howard | 39 12 09 N | 076 50 58 W |
| Julia Rogers Library | Building | 134 | Baltimore | 39 24 36 N | 076 35 41 W |
| Julia Rogers Library | Building | | Baltimore | 39 24 36 N | 076 35 42 W |
| Julian Woods | Populated Place | 142 | Baltimore | 39 22 32 N | 076 45 29 W |
| Julie Pond | Lake | 0 | Dorchester | 38 24 44 N | 075 58 16 W |
| Julius West Middle School | School | 128 | Montgomery | 39 04 36 N | 077 09 50 W |
| Jumpers Junction Mall Shopping Center | Locale | 19 | Anne Arundel | 39 07 35 N | 076 35 33 W |
| Jumptown | Populated Place | 12 | Caroline | 38 57 40 N | 075 55 07 W |
| Junction Industrial Park | Locale | 61 | Howard | 39 07 28 N | 076 48 06 W |
| June Acres | Populated Place | 489 | Frederick | 39 36 38 N | 077 30 41 W |
| Junior Fire Company Number 2 | Building | | Frederick | 39 42 07 N | 077 41 01 W |
| Justice Heights | Populated Place | 13 | Wicomico | 38 22 31 N | 075 33 03 W |
| Justifiable | Populated Place | 198 | Howard | 39 19 38 N | 077 01 46 W |
| Jutland Creek | Bay | 1 | St. Mary's | 38 07 45 N | 076 23 53 W |
| Jutland Neck | Cape | 6 | St. Mary's | 38 08 08 N | 076 24 31 W |
| Kabik Korner | Populated Place | 171 | Carroll | 39 21 41 N | 077 01 04 W |
| Kaese Mill | Populated Place | 633 | Garrett | 39 39 01 N | 079 17 46 W |
| Kagle Tract Recreation Center | Park | 49 | Prince George's | 38 56 07 N | 076 49 39 W |
| Kalmia | Populated Place | 135 | Harford | 39 36 19 N | 076 18 15 W |
| Kalmia Farms | Locale | 146 | Howard | 39 13 25 N | 077 00 56 W |
| Kalmia Ridge | Populated Place | 7 | Anne Arundel | 39 01 11 N | 076 34 23 W |
| Kalten Acres | Populated Place | 239 | Carroll | 39 37 09 N | 076 59 58 W |
| Kanawah Inn (historical) | Building | 97 | Frederick | 39 16 24 N | 077 29 55 W |