| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| Radnor Green | city | Delaware | United States | 39.81 | -75.47 | 98 | |
| Raintree Village | city | Delaware | United States | 39.65 | -75.68 | 42 | |
| Ralphs | city | Delaware | United States | 38.50 | -75.64 | 39 | |
| Ramble Woods | city | Delaware | United States | 39.82 | -75.47 | 134 | |
| Rambleton Acres | city | Delaware | United States | 39.66 | -75.62 | 49 | |
| Ravenwood | city | Delaware | United States | 39.29 | -75.56 | 9 | |
| Records Estates | city | Delaware | United States | 38.51 | -75.59 | 29 | |
| Red Hill Manor | city | Delaware | United States | 38.76 | -75.21 | 16 | |
| Red Lion | city | Delaware | United States | 39.61 | -75.66 | 49 | |
| Red Mill Farms | city | Delaware | United States | 38.75 | -75.21 | 19 | |
| Red Mills Farms | city | Delaware | United States | 39.70 | -75.71 | 55 | |
| Redden | city | Delaware | United States | 38.74 | -75.42 | 45 | |
| Redden Crossroads | city | Delaware | United States | 38.74 | -75.42 | 42 | |
| Redmont | city | Delaware | United States | 39.72 | -75.64 | 59 | |
| Reeves Crossing | city | Delaware | United States | 38.98 | -75.58 | 39 | |
| Rehak | city | Delaware | United States | 39.17 | -75.71 | 45 | |
| Rehoboth Beach | city | Delaware | United States | 38.72 | -75.08 | 0 | |
| Rehoboth Manor | city | Delaware | United States | 38.71 | -75.09 | 13 | |
| Rehoboth Shores Mobile Home Park | city | Delaware | United States | 38.63 | -75.14 | 3 | |
| Reybold | city | Delaware | United States | 39.59 | -75.63 | 49 | |
| Reynard Crossing | city | Delaware | United States | 39.23 | -75.74 | 45 | |
| Reynolds Mill | city | Delaware | United States | 38.81 | -75.34 | 19 | |
| Richard Heights | city | Delaware | United States | 38.68 | -75.64 | 32 | |
| Richardson Estates | city | Delaware | United States | 39.11 | -75.52 | 9 | |
| Richardson Park | city | Delaware | United States | 39.73 | -75.59 | 72 | |
| Ricland Heights | city | Delaware | United States | 38.67 | -75.64 | 32 | |
| Ridgewood | city | Delaware | United States | 39.77 | -75.51 | 134 | |
| Ridgewood Manor | city | Delaware | United States | 39.26 | -75.58 | 9 | |
| Rising Sun | city | Delaware | United States | 39.10 | -75.52 | 9 | |
| Rising Sun Mobile Home Park | city | Delaware | United States | 39.10 | -75.51 | 3 | |
| River Breeze | city | Delaware | United States | 38.62 | -75.19 | 19 | |
| River Village II Mobile Home Park | city | Delaware | United States | 38.61 | -75.20 | 16 | |
| River Village Mobile Home Park | city | Delaware | United States | 38.62 | -75.20 | 16 | |
| River-view Acres | city | Delaware | United States | 38.56 | -75.63 | 19 | |
| Riverdale | city | Delaware | United States | 38.59 | -75.18 | 0 | |
| Riverdale | city | Delaware | United States | 38.59 | -75.19 | 3 | |
| Riverdale Estates Mobile Home Park | city | Delaware | United States | 39.03 | -75.58 | 49 | |
| Riveredge Park | city | Delaware | United States | 39.69 | -75.55 | 9 | |
| Rivers End | city | Delaware | United States | 39.64 | -75.66 | 49 | |
| Riverside | city | Delaware | United States | 39.80 | -75.47 | 32 | |
| Riverside Addition | city | Delaware | United States | 39.79 | -75.46 | 0 | |
| Riverview | city | Delaware | United States | 39.03 | -75.51 | 9 | |
| Riverview | city | Delaware | United States | 38.58 | -75.27 | 19 | |
| Riverview Gardens | city | Delaware | United States | 39.82 | -75.46 | 72 | |
| Robbins | city | Delaware | United States | 38.76 | -75.42 | 39 | |
| Robertson Landing | city | Delaware | United States | 38.81 | -75.24 | 3 | |
| Robinson Landing | city | Delaware | United States | 38.69 | -75.14 | 0 | |
| Robinsonville | city | Delaware | United States | 38.71 | -75.19 | 16 | |
| Robscott Manor | city | Delaware | United States | 39.66 | -75.75 | 78 | |
| Rock Manor | city | Delaware | United States | 39.77 | -75.55 | 108 | |
| Rockland | city | Delaware | United States | 39.80 | -75.57 | 275 | |
| Rockland Hills | city | Delaware | United States | 39.10 | -75.60 | 49 | |
| Rockland West | city | Delaware | United States | 39.15 | -75.62 | 49 | |
| Rockland Woods | city | Delaware | United States | 39.80 | -75.58 | 275 | |
| Rockwood Hills | city | Delaware | United States | 39.78 | -75.53 | 206 | |
| Rockwood Woods | city | Delaware | United States | 39.77 | -75.53 | 95 | |
| Rodney Village | city | Delaware | United States | 39.13 | -75.53 | 19 | |
| Rodric Village | city | Delaware | United States | 39.13 | -75.52 | 9 | |
| Roesville | city | Delaware | United States | 39.00 | -75.53 | 39 | |
| Rogers Corners | city | Delaware | United States | 39.71 | -75.55 | 32 | |
| Rogers Development | city | Delaware | United States | 38.70 | -75.36 | 49 | |
| Rogers Haven | city | Delaware | United States | 38.56 | -75.09 | 3 | |
| Rogers Haven | city | Delaware | United States | 38.56 | -75.09 | 3 | |
| Rogers Manor | city | Delaware | United States | 39.67 | -75.56 | 3 | |
| Rolling Hills | city | Delaware | United States | 39.72 | -75.65 | 62 | |
| Rolling Meadows | city | Delaware | United States | 39.22 | -75.63 | 45 | |
| Rolling Meadows | city | Delaware | United States | 39.58 | -75.68 | 49 | |
| Rolling Park | city | Delaware | United States | 39.79 | -75.47 | 0 | |
| Rolling Ridge | city | Delaware | United States | 39.76 | -75.68 | 295 | |
| Rose Hill Gardens | city | Delaware | United States | 39.71 | -75.55 | 32 | |
| Rose Valley Estates | city | Delaware | United States | 39.40 | -75.72 | 49 | |
| Rosegate | city | Delaware | United States | 39.71 | -75.55 | 32 | |
| Roselle Terrace | city | Delaware | United States | 39.74 | -75.61 | 98 | |
| Roseville Park | city | Delaware | United States | 39.70 | -75.71 | 62 | |
| Ross | city | Delaware | United States | 38.66 | -75.62 | 26 | |
| Roxana | city | Delaware | United States | 38.50 | -75.17 | 22 | |
| Roxford | city | Delaware | United States | 38.55 | -75.13 | 16 | |
| Royal Grant | city | Delaware | United States | 39.11 | -75.53 | 19 | |
| Runnymeade | city | Delaware | United States | 39.77 | -75.69 | 298 | |
| Ruth Harbor | city | Delaware | United States | 38.66 | -75.55 | 22 | |
| Ruthby | city | Delaware | United States | 39.69 | -75.70 | 49 | |
| Rutherford | city | Delaware | United States | 39.69 | -75.68 | 49 | |
| Ryans Run | city | Delaware | United States | 39.25 | -75.58 | 9 |