Feature Name | Class | Elev. meters | County | Latitude DMS | Longitude DMS |
| Red Bank | Levee | 5 | New Castle | 39 25 20 N | 075 36 01 W |
| Red Clay Creek | Stream | | New Castle | 39 42 35 N | 075 38 45 W |
| Red Clay Creek Presbyterian Church | Church | 75 | New Castle | 39 45 07 N | 075 39 36 W |
| Red Hill Manor | Populated Place | 6 | Sussex | 38 45 41 N | 075 12 21 W |
| Red House Branch | Stream | | Kent | 39 05 17 N | 075 33 49 W |
| Red Lion | Populated Place | 10 | New Castle | 39 36 30 N | 075 39 50 W |
| Red Lion Christian Academy | School | 13 | New Castle | 39 36 28 N | 075 39 57 W |
| Red Lion Church | Church | 11 | New Castle | 39 36 29 N | 075 39 54 W |
| Red Lion Creek | Stream | | New Castle | 39 36 17 N | 075 36 50 W |
| Red Lion Hundred | Civil | 11 | New Castle | 39 35 30 N | 075 39 59 W |
| Red Lion Methodist Church | Church | 10 | New Castle | 39 36 25 N | 075 39 54 W |
| Red Lion Methodist Church | Church | 13 | New Castle | 39 36 28 N | 075 39 57 W |
| Red Lion State Forest | Forest | 2 | New Castle | 39 36 22 N | 075 39 14 W |
| Red Men Cemetery | Cemetery | 11 | Sussex | 38 27 59 N | 075 13 38 W |
| Red Mill Farms | Populated Place | 9 | Sussex | 38 44 56 N | 075 12 21 W |
| Red Mill Pond | Reservoir | 2 | Sussex | 38 45 36 N | 075 12 13 W |
| Red Mill Pond Dam | Dam | 2 | Sussex | 38 45 36 N | 075 12 13 W |
| Red Mills Farms (subdivision) | Populated Place | 29 | New Castle | 39 41 56 N | 075 42 45 W |
| Redden | Populated Place | 14 | Sussex | 38 44 29 N | 075 25 02 W |
| Redden Crossroads | Populated Place | 14 | Sussex | 38 44 21 N | 075 25 23 W |
| Redden State Forest | Forest | 14 | Sussex | 38 44 12 N | 075 23 56 W |
| Redden State Forest Bailey Tract | Forest | 12 | Sussex | 38 42 50 N | 075 25 33 W |
| Redding Middle School | School | 20 | New Castle | 39 27 09 N | 075 42 37 W |
| Redmont (subdivision) | Populated Place | 9 | New Castle | 39 42 59 N | 075 38 07 W |
| Reedy Island | Island | 1 | New Castle | 39 30 55 N | 075 33 47 W |
| Reedy Island | Island | 0 | Sussex | 38 30 00 N | 075 03 48 W |
| Reedy Island Bar | Bar | -3 | New Castle | 39 32 20 N | 075 33 29 W |
| Reedy Island Dike | Dam | 2 | New Castle | 39 29 16 N | 075 34 20 W |
| Reedy Island Neck | Cape | 1 | New Castle | 39 29 15 N | 075 36 14 W |
| Reedy Island Range | Channel | -5 | New Castle | 39 31 10 N | 075 33 14 W |
| Reedy Point | Cape | 0 | New Castle | 39 33 45 N | 075 33 43 W |
| Reedy Point | Cape | -3 | Sussex | 38 30 05 N | 075 03 47 W |
| Reedy Point Bridge | Bridge | -4 | New Castle | 39 33 29 N | 075 34 57 W |
| Reese Memorial Chapel | Church | 11 | Kent | 39 09 31 N | 075 32 20 W |
| Reeves Crossing | Populated Place | 12 | Kent | 38 59 00 N | 075 34 41 W |
| Reformation Lutheran Church | Church | 7 | Sussex | 38 54 22 N | 075 26 13 W |
| Rehoboth Aircrafters Airport | Airport | 7 | Sussex | 38 43 00 N | 075 07 44 W |
| Rehoboth Bay | Bay | -3 | Sussex | 38 39 41 N | 075 05 55 W |
| Rehoboth Beach | Beach | 3 | Sussex | 38 43 00 N | 075 04 34 W |
| Rehoboth Beach | Populated Place | 1 | Sussex | 38 43 15 N | 075 04 34 W |
| Rehoboth Beach Elementary School | School | 5 | Sussex | 38 42 32 N | 075 05 21 W |
| Rehoboth Beach Yacht and Country Club | Locale | 1 | Sussex | 38 41 27 N | 075 06 33 W |
| Rehoboth Church | Church | 19 | New Castle | 39 27 13 N | 075 42 41 W |
| Rehoboth Flats | Flat | 1 | Sussex | 38 44 44 N | 075 05 08 W |
| Rehoboth Junior High School | School | 6 | Sussex | 38 42 35 N | 075 05 14 W |
| Rehoboth Manor | Populated Place | 3 | Sussex | 38 42 24 N | 075 05 26 W |
| Rehoboth Marsh | Swamp | 1 | Sussex | 38 40 21 N | 075 04 22 W |
| Rehoboth Shores Mobile Home Park | Populated Place | 1 | Sussex | 38 37 50 N | 075 08 11 W |
| Rehoboth Station (historical) | Locale | 1 | Sussex | 38 42 46 N | 075 05 36 W |
| Religious Society of Friends | Church | 1 | Sussex | 38 43 40 N | 075 04 52 W |
| Revills Landing | Locale | 1 | Sussex | 38 56 48 N | 075 21 04 W |
| Reybold | Populated Place | 15 | New Castle | 39 35 32 N | 075 37 49 W |
| Reybold Cove | Bay | 2 | New Castle | 39 35 25 N | 075 36 14 W |
| Reynolds Church (historical) | Church | 10 | Sussex | 38 48 39 N | 075 20 33 W |
| Reynolds Corners | Locale | 24 | New Castle | 39 19 12 N | 075 42 22 W |
| Reynolds Mill | Populated Place | 8 | Sussex | 38 48 47 N | 075 20 39 W |
| Reynolds Pond | Reservoir | 5 | Sussex | 38 48 53 N | 075 20 42 W |
| Reynolds Pond Dam (historical) | Dam | 5 | Sussex | 38 48 53 N | 075 20 42 W |
| Richard A Shields Elemantary School | School | 4 | Sussex | 38 46 02 N | 075 08 54 W |
| Richard Heights | Populated Place | 12 | Sussex | 38 40 30 N | 075 38 19 W |
| Richardson Estates | Populated Place | 9 | Kent | 39 06 50 N | 075 30 59 W |
| Richardson Park | Park | 8 | Kent | 39 10 22 N | 075 31 53 W |
| Richardson Park | Populated Place | 24 | New Castle | 39 43 55 N | 075 35 09 W |
| Richardson Park Church | Church | 24 | New Castle | 39 43 46 N | 075 35 06 W |
| Richardson Park Elementary School | School | 24 | New Castle | 39 43 23 N | 075 35 26 W |
| Richardson Park Junior High School | School | 24 | New Castle | 39 43 23 N | 075 35 29 W |
| Ricland Heights | Populated Place | 11 | Sussex | 38 40 26 N | 075 38 18 W |
| Ridgewood | Populated Place | 48 | New Castle | 39 46 00 N | 075 30 44 W |
| Ringgold Chapel | Church | 21 | New Castle | 39 28 50 N | 075 43 13 W |
| Rising Sun | Populated Place | 10 | Kent | 39 06 01 N | 075 30 56 W |
| Rising Sun Mobile Home Park | Populated Place | 12 | Kent | 39 05 49 N | 075 30 41 W |
| Rittenhouse Park | Park | 27 | New Castle | 39 39 15 N | 075 45 29 W |
| Rittenhouse Park | Park | 26 | New Castle | 39 39 18 N | 075 45 29 W |
| River Breeze | Populated Place | 6 | Sussex | 38 37 25 N | 075 11 33 W |
| River Road School | School | 28 | New Castle | 39 45 57 N | 075 29 24 W |
| River Shore Ditch | Gut | 1 | New Castle | 39 24 49 N | 075 32 31 W |
| River Village II Mobile Home Park | Populated Place | 6 | Sussex | 38 36 45 N | 075 11 59 W |
| River Village Mobile Home Park | Populated Place | 7 | Sussex | 38 37 01 N | 075 11 47 W |
| River-view Acres | Populated Place | 5 | Sussex | 38 33 51 N | 075 38 02 W |
| Riverdale | Populated Place | 2 | Sussex | 38 35 39 N | 075 11 04 W |
| Riverdale | Populated Place | 0 | Sussex | 38 35 38 N | 075 11 29 W |
| Riverdale Estates Mobile Home Park | Populated Place | 18 | Kent | 39 02 05 N | 075 34 59 W |
| Riverdale Park | Park | 0 | Sussex | 38 35 40 N | 075 10 50 W |
| Riverdale Park | Park | 1 | Sussex | 38 35 42 N | 075 10 49 W |
| Riverdale Park Airport (historical) | Airport | 3 | Sussex | 38 35 52 N | 075 11 15 W |
| Riveredge Park | Populated Place | 7 | New Castle | 39 41 20 N | 075 32 54 W |
| Rivers End | Populated Place | 21 | New Castle | 39 38 15 N | 075 39 31 W |
| Riverside | Populated Place | 18 | New Castle | 39 47 45 N | 075 27 59 W |
| Riverside Addition (subdivision) | Populated Place | 8 | New Castle | 39 47 40 N | 075 27 49 W |
| Riverside Extended Care Pavilion | Hospital | 29 | New Castle | 39 45 21 N | 075 30 45 W |
| Riverview | Populated Place | 9 | Kent | 39 01 35 N | 075 30 39 W |
| Riverview | Populated Place | 6 | Sussex | 38 34 57 N | 075 16 29 W |
| Riverview Cemetery | Cemetery | 24 | New Castle | 39 45 25 N | 075 31 43 W |
| Riverview Gardens | Populated Place | 43 | New Castle | 39 49 11 N | 075 27 37 W |
| Roach Marsh | Swamp | 1 | Sussex | 38 51 02 N | 075 14 47 W |
| Robbins | Populated Place | 13 | Sussex | 38 45 43 N | 075 25 18 W |
| Robert C Gallaher Elementary School | School | 27 | New Castle | 39 40 52 N | 075 40 40 W |
| Robertson Landing | Populated Place | 1 | Sussex | 38 48 19 N | 075 14 35 W |
| Robesons Mill (historical) | Locale | 8 | New Castle | 39 48 35 N | 075 26 37 W |
| Robinson Landing | Populated Place | 0 | Sussex | 38 41 35 N | 075 08 30 W |
| Robinsonville | Populated Place | 6 | Sussex | 38 42 49 N | 075 11 32 W |
| Robs Island | Island | 1 | New Castle | 39 25 48 N | 075 34 07 W |
| Robscott Manor | Populated Place | 29 | New Castle | 39 39 25 N | 075 44 49 W |
| Roby United Methodist Church | Church | 3 | Kent | 39 14 22 N | 075 30 50 W |
| Rock Manor | Populated Place | 80 | New Castle | 39 46 10 N | 075 32 44 W |
| Rock of Ages Baptist Church | Church | 17 | New Castle | 39 43 27 N | 075 37 27 W |
| Rock Point | Cape | -3 | Sussex | 38 34 51 N | 075 10 50 W |
| Rock Spring | Spring | 97 | New Castle | 39 47 43 N | 075 34 59 W |
| Rockford Center | Hospital | 12 | New Castle | 39 41 44 N | 075 39 38 W |
| Rockford Park | Park | 60 | New Castle | 39 46 02 N | 075 34 15 W |