Feature Name | Class | Elev. meters | County | Latitude DMS | Longitude DMS |
| Redhill Estates | Populated Place | 38 | Charles | 38 33 59 N | 077 07 51 W |
| Redhouse | Populated Place | 775 | Garrett | 39 18 31 N | 079 27 14 W |
| Redhouse Cove | Bay | -5 | Anne Arundel | 39 05 00 N | 076 26 03 W |
| Redhouse Creek | Stream | | Baltimore | 39 18 28 N | 076 30 48 W |
| Redington Lake | Reservoir | 33 | Prince George's | 39 01 36 N | 076 47 47 W |
| Redington Lake Dam | Dam | 33 | Prince George's | 39 01 36 N | 076 47 47 W |
| Redland | Populated Place | 150 | Montgomery | 39 08 43 N | 077 08 39 W |
| Redland Baptist Church | Church | 142 | Montgomery | 39 08 33 N | 077 08 24 W |
| Redland Middle School | School | 136 | Montgomery | 39 08 26 N | 077 07 56 W |
| Redman Branch | Stream | | St. Mary's | 38 11 21 N | 076 31 20 W |
| Redman Cemetery | Cemetery | 9 | Wicomico | 38 31 43 N | 075 42 49 W |
| Redman Cove | Bay | -9 | Harford | 39 22 55 N | 076 15 03 W |
| Redwood Lake | Reservoir | 42 | Charles | 38 30 59 N | 076 57 20 W |
| Reece Heights | Populated Place | 43 | Anne Arundel | 39 07 16 N | 076 42 44 W |
| Reed Bird Island | Island | 4 | Baltimore (city) | 39 14 31 N | 076 36 40 W |
| Reed Bird Island Park | Park | 4 | Baltimore (city) | 39 14 34 N | 076 36 40 W |
| Reed Creek | Stream | | Queen Anne's | 39 04 00 N | 076 09 51 W |
| Reed Marsh | Swamp | 0 | Anne Arundel | 38 45 21 N | 076 41 32 W |
| Reeder Run | Stream | | Charles | 38 32 11 N | 077 13 56 W |
| Reeder Wharf | Locale | 0 | St. Mary's | 38 27 25 N | 076 39 22 W |
| Reeds Creek | Stream | | Talbot | 38 37 11 N | 076 05 01 W |
| Reeds Village | Populated Place | 312 | Carroll | 39 39 07 N | 076 53 47 W |
| Reedy Branch Park | Park | 145 | Montgomery | 39 10 35 N | 077 04 51 W |
| Reedy Island | Island | 0 | Worcester | 38 22 47 N | 075 04 25 W |
| Reedy Island (historical) | Island | 0 | Worcester | 38 26 26 N | 075 04 06 W |
| Reels Mill | Populated Place | 83 | Frederick | 39 21 40 N | 077 22 07 W |
| Rees Cross Road | Locale | 7 | Kent | 39 12 53 N | 076 13 34 W |
| Rees Wharf | Locale | 0 | Kent | 39 12 55 N | 076 14 39 W |
| Reese | Populated Place | 243 | Carroll | 39 32 34 N | 076 56 16 W |
| Reese Carnival Grounds | Locale | 249 | Carroll | 39 32 28 N | 076 56 04 W |
| Reese Manor | Populated Place | 239 | Carroll | 39 31 51 N | 076 55 58 W |
| Reese Volunteer Fire Company | Building | | Carroll | 39 54 35 N | 077 33 47 W |
| Reeses Corner | Populated Place | 6 | Kent | 39 10 28 N | 076 11 49 W |
| Reformation Lutheran Church | Church | 98 | Baltimore (city) | 39 22 09 N | 076 35 04 W |
| Refuge Church of Christ | Church | 156 | Montgomery | 39 09 21 N | 077 04 18 W |
| Refuge of the Cross Church | Church | 94 | Baltimore (city) | 39 20 29 N | 076 36 28 W |
| Regal Estastes | Populated Place | 26 | Calvert | 38 44 32 N | 076 40 19 W |
| Regency Estates | Populated Place | 116 | Montgomery | 39 02 53 N | 077 10 12 W |
| Regency Manor Mobile Home Park | Populated Place | 51 | Calvert | 38 44 20 N | 076 39 03 W |
| Regina High School | School | 52 | Prince George's | 39 00 09 N | 076 58 25 W |
| Reginald F Lewis Museum of Maryland African-American History and Culture | Building | | Baltimore (city) | 39 17 14 N | 076 36 13 W |
| Regional Institute for Children and Adolescents | School | 141 | Montgomery | 39 06 06 N | 077 12 00 W |
| Regwood | Populated Place | 136 | Baltimore | 39 28 09 N | 076 26 57 W |
| Rehobeth | Populated Place | 1 | Somerset | 38 02 20 N | 075 39 47 W |
| Rehobeth Baptist Church | Church | 1 | Somerset | 38 02 20 N | 075 39 52 W |
| Rehobeth Branch | Stream | | Somerset | 38 02 29 N | 075 39 46 W |
| Rehobeth Cemetery | Cemetery | 2 | Somerset | 38 02 20 N | 075 40 17 W |
| Rehobeth Cemetery | Cemetery | 1 | Somerset | 38 01 51 N | 075 40 20 W |
| Rehobeth Cemetery | Cemetery | 1 | Somerset | 38 02 20 N | 075 39 53 W |
| Rehobeth Post Office | Post Office | 1 | Somerset | 38 02 19 N | 075 39 47 W |
| Rehobeth Presbyterian Church | Church | 2 | Somerset | 38 02 21 N | 075 40 17 W |
| Rehoboth Church of God | Church | 63 | Baltimore (city) | 39 17 44 N | 076 39 55 W |
| Rehoboth United Methodist Church | Church | 1 | Somerset | 38 01 50 N | 075 40 20 W |
| Rehoboth United Methodist Church | Church | 133 | Washington | 39 35 55 N | 077 49 11 W |
| Reichs Ford Estates | Populated Place | 145 | Frederick | 39 22 55 N | 077 21 54 W |
| Reid | Populated Place | 177 | Washington | 39 42 44 N | 077 40 45 W |
| Reid Hall School (historical) | School | 16 | Kent | 39 13 00 N | 076 04 07 W |
| Reids Grove | Populated Place | 7 | Dorchester | 38 32 01 N | 075 49 39 W |
| Reids Grove Cemetery | Cemetery | 7 | Dorchester | 38 31 58 N | 075 49 42 W |
| Reids Grove United Methodist Church | Church | 7 | Dorchester | 38 31 59 N | 075 49 41 W |
| Reiffs Cemetery | Cemetery | 167 | Washington | 39 42 03 N | 077 45 53 W |
| Reiffs Church | Church | 169 | Washington | 39 42 05 N | 077 45 52 W |
| Reisterstown | Populated Place | 221 | Baltimore | 39 28 10 N | 076 49 46 W |
| Reisterstown Baptist Church | Church | 194 | Baltimore | 39 26 49 N | 076 48 44 W |
| Reisterstown Business Center | Locale | | Baltimore | 39 27 50 N | 076 49 36 W |
| Reisterstown Elementary School | School | 214 | Baltimore | 39 27 18 N | 076 48 58 W |
| Reisterstown Post Office | Post Office | 219 | Baltimore | 39 27 34 N | 076 49 29 W |
| Reisterstown Public Library | Building | 214 | Baltimore | 39 27 50 N | 076 49 45 W |
| Reisterstown Road Branch Enoch Pratt Free Library | Building | 138 | Baltimore (city) | 39 21 16 N | 076 42 03 W |
| Reisterstown Road Plaza Shopping Center | Locale | 141 | Baltimore (city) | 39 21 23 N | 076 42 22 W |
| Reisterstown Shopping Center | Locale | 207 | Baltimore | 39 26 58 N | 076 48 54 W |
| Reisterstown Village Shopping Center | Locale | 220 | Baltimore | 39 28 10 N | 076 49 49 W |
| Reisterstown Volunteer Fire Company Station 41 | Building | | Baltimore | 39 27 58 N | 076 49 46 W |
| Reits Branch | Stream | | Calvert | 38 34 47 N | 076 36 30 W |
| Relay | Populated Place | 37 | Baltimore | 39 13 40 N | 076 42 11 W |
| Relay Elementary School | School | 49 | Baltimore | 39 13 52 N | 076 42 00 W |
| Relay Methodist Church | Church | 32 | Baltimore | 39 13 33 N | 076 42 21 W |
| Relay Presbyterian Church | Church | 37 | Baltimore | 39 13 37 N | 076 42 22 W |
| Relay Public School (historical) | School | 39 | Baltimore | 39 13 39 N | 076 42 25 W |
| Relda Square | Populated Place | 129 | Montgomery | 39 08 08 N | 077 14 47 W |
| Reliance | Populated Place | 13 | Dorchester | 38 38 07 N | 075 42 23 W |
| Remington Farms | Populated Place | 4 | Kent | 39 10 52 N | 076 10 16 W |
| Remington Farms National Wildlife Preserve | Park | 4 | Kent | 39 11 08 N | 076 10 21 W |
| Remsberg Acres | Populated Place | 171 | Frederick | 39 25 57 N | 077 32 22 W |
| Remsburg Heights | Populated Place | 150 | Frederick | 39 27 12 N | 077 18 41 W |
| Remson Cemetery | Cemetery | 9 | Worcester | 38 01 19 N | 075 28 16 W |
| Remson Church | Church | 8 | Worcester | 38 01 21 N | 075 28 16 W |
| Renix (historical) | Populated Place | 219 | Allegany | 39 33 30 N | 078 51 42 W |
| Renn Branch | Stream | | Frederick | 39 22 46 N | 077 27 35 W |
| Renn Branch Estates | Populated Place | 119 | Frederick | 39 22 12 N | 077 28 56 W |
| Renner Branch | Stream | | Frederick | 39 32 27 N | 077 17 49 W |
| Reno Monument | Park | 323 | Frederick | 39 28 13 N | 077 36 60 W |
| Reno School (historical) | School | 221 | Frederick | 39 27 47 N | 077 36 19 W |
| Reo Vista Plaza | Populated Place | 18 | Anne Arundel | 38 49 07 N | 076 41 39 W |
| Rescue Fire Company | Building | | Dorchester | 38 57 01 N | 076 08 12 W |
| Research Office Center | Locale | 126 | Montgomery | 39 06 02 N | 077 11 02 W |
| Research West Industrial Park | Locale | 138 | Montgomery | 39 06 15 N | 077 11 09 W |
| Reservoir Airport | Airport | 164 | Carroll | 39 28 55 N | 076 52 54 W |
| Reservoir High School | School | 142 | Howard | 39 09 06 N | 076 54 48 W |
| Reservoir Hill Branch Enoch Pratt Free Library | Building | 52 | Baltimore (city) | 39 18 47 N | 076 37 42 W |
| Reservoir Ridge | Populated Place | 165 | Baltimore | 39 23 56 N | 076 52 11 W |
| Resh Hill | Summit | 846 | Garrett | 39 38 45 N | 079 12 54 W |
| Resh Mill Farms | Populated Place | 240 | Baltimore | 39 39 34 N | 076 48 13 W |
| Resolution Farm | Locale | 115 | Frederick | 39 32 21 N | 077 21 29 W |
| Resourceful Acres | Populated Place | 158 | Frederick | 39 25 38 N | 077 12 33 W |
| Rest Haven | Populated Place | 4 | Anne Arundel | 38 46 41 N | 076 32 23 W |
| Rest Haven Cemetery | Cemetery | 180 | Washington | 39 40 09 N | 077 43 18 W |
| Resthaven Memorial Cemetery | Cemetery | 93 | Frederick | 39 29 33 N | 077 23 49 W |
| Resurrection - Saint Paul School | School | 124 | Howard | 39 16 55 N | 076 49 46 W |
| Resurrection Catholic Church | Church | 143 | Montgomery | 39 05 52 N | 076 56 39 W |