| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| Jacksons Ridge | city | Delaware | United States | 38.94 | -75.54 | 49 | |
| Jacobs Crossroads | city | Delaware | United States | 38.74 | -75.69 | 49 | |
| Jamestowne | city | Delaware | United States | 39.65 | -75.64 | 49 | |
| Jamisons Corner | city | Delaware | United States | 39.50 | -75.68 | 49 | |
| Jarrell Farms | city | Delaware | United States | 39.76 | -75.71 | 298 | |
| Jefferson Crossroads | city | Delaware | United States | 38.83 | -75.35 | 22 | |
| Jefferson Farms | city | Delaware | United States | 39.68 | -75.57 | 16 | |
| Jimtown | city | Delaware | United States | 38.73 | -75.19 | 19 | |
| John Char Estates | city | Delaware | United States | 38.92 | -75.54 | 49 | |
| John Marsh Landing | city | Delaware | United States | 38.66 | -75.16 | 3 | |
| Johnson | city | Delaware | United States | 38.48 | -75.14 | 19 | |
| Johnson Development | city | Delaware | United States | 38.61 | -75.60 | 26 | |
| Johnson Farm | city | Delaware | United States | 39.30 | -75.63 | 19 | |
| Jones Crossroads | city | Delaware | United States | 38.60 | -75.45 | 49 |