Feature Name | Class | Elev. meters | County | Latitude DMS | Longitude DMS |
| Israel Point | Cape | -3 | Sussex | 38 34 20 N | 075 11 10 W |
| Issac Branch | Stream | | Kent | 39 07 42 N | 075 30 11 W |
| Ivy Dale Farm (historical) | Locale | 4 | Kent | 39 17 07 N | 075 34 39 W |
| Ivy Ridge | Populated Place | 7 | New Castle | 39 40 30 N | 075 37 59 W |
| J. Ralph McIlvaine Elementary School | School | 7 | Kent | 39 04 20 N | 075 28 29 W |
| Jack Roach Pond | Lake | 1 | Sussex | 38 49 39 N | 075 16 17 W |
| Jackson Branch | Stream | | Sussex | 38 26 00 N | 075 33 16 W |
| Jackson Prong | Stream | | Kent | 39 02 57 N | 075 41 32 W |
| Jacobs Crossroads | Populated Place | 15 | Sussex | 38 44 35 N | 075 41 10 W |
| James Branch | Stream | | Sussex | 38 33 23 N | 075 32 46 W |
| James Court Industrial Park | Locale | 14 | New Castle | 39 43 38 N | 075 30 57 W |
| Jamestowne | Populated Place | 25 | New Castle | 39 39 08 N | 075 38 37 W |
| Jamison Branch | Stream | | Kent | 39 12 12 N | 075 44 23 W |
| Jamisons Corner | Populated Place | 20 | New Castle | 39 30 13 N | 075 41 04 W |
| Jarrell Farms | Populated Place | 98 | New Castle | 39 45 20 N | 075 42 30 W |
| Jay Patch | Swamp | 11 | Sussex | 38 29 20 N | 075 12 57 W |
| Jefferson Bridge | Bridge | 1 | Sussex | 38 31 21 N | 075 04 08 W |
| Jefferson Creek | Gut | 0 | Sussex | 38 30 45 N | 075 03 49 W |
| Jefferson Crossroads | Populated Place | 10 | Sussex | 38 50 03 N | 075 20 43 W |
| Jefferson Farms | Populated Place | 6 | New Castle | 39 40 44 N | 075 34 16 W |
| Jehu Reed House (historical) | Building | 10 | Kent | 39 02 30 N | 075 27 31 W |
| Jenkins Airfield | Airport | 12 | Kent | 39 07 10 N | 075 35 02 W |
| Jenkins Ditch | Gut | 0 | Kent | 39 11 55 N | 075 25 46 W |
| Jenkins Pond | Reservoir | 4 | Kent | 38 57 33 N | 075 25 17 W |
| Jennie E Smith Elementary School | School | 23 | New Castle | 39 40 30 N | 075 42 34 W |
| Jester Park | Park | 129 | New Castle | 39 49 24 N | 075 31 37 W |
| Jewish Community Cemetery | Cemetery | 94 | New Castle | 39 46 51 N | 075 32 29 W |
| Jewish Community Center | School | 119 | New Castle | 39 48 30 N | 075 33 12 W |
| Jimtown | Populated Place | 6 | Sussex | 38 43 55 N | 075 11 12 W |
| Jobs Ditch | Stream | | Sussex | 38 35 37 N | 075 29 51 W |
| Joe Flogger Shoal | Bar | -11 | Kent | 39 08 45 N | 075 15 15 W |
| Joe Flogger Shoal | Bar | -10 | Kent | 39 09 00 N | 075 14 59 W |
| Joes Gut | Gut | 0 | Sussex | 38 28 50 N | 075 05 43 W |
| Joes Hole | Gut | 0 | Kent | 39 13 34 N | 075 26 02 W |
| John Bassett Moore Middle School | School | 11 | Kent | 39 17 54 N | 075 36 19 W |
| John Dickinson High School | School | 46 | New Castle | 39 43 40 N | 075 40 24 W |
| John Dickinson Mansion | Building | 4 | Kent | 39 06 04 N | 075 26 53 W |
| John E Morris Correctional Institute | Building | 9 | Kent | 39 09 12 N | 075 31 41 W |
| John G Leach School | School | 11 | New Castle | 39 41 20 N | 075 33 28 W |
| John Marsh Landing | Populated Place | 1 | Sussex | 38 39 31 N | 075 09 53 W |
| John R Downes Elementary School | School | 42 | New Castle | 39 41 00 N | 075 46 35 W |
| Johnson | Populated Place | 3 | Sussex | 38 28 31 N | 075 08 19 W |
| Johnson Airport | Airport | 12 | Kent | 39 04 05 N | 075 29 19 W |
| Johnson Branch | Stream | | Sussex | 38 42 02 N | 075 07 13 W |
| Johnson Branch | Stream | | Sussex | 38 54 34 N | 075 27 38 W |
| Johnson Development | Populated Place | 10 | Sussex | 38 36 52 N | 075 36 04 W |
| Johnson Neck | Cape | 1 | Sussex | 38 41 45 N | 075 06 37 W |
| Jones Branch | Stream | | Sussex | 38 46 05 N | 075 42 52 W |
| Jones Crossroads | Populated Place | 15 | Sussex | 38 36 16 N | 075 26 49 W |
| Jones Mill Branch | Stream | | Sussex | 38 46 31 N | 075 42 29 W |
| Jones Pond | Lake | 1 | Sussex | 38 51 00 N | 075 15 36 W |
| Jordan Branch | Stream | | Kent | 39 14 49 N | 075 43 56 W |
| Joseph H Douglass School | School | 30 | New Castle | 39 44 24 N | 075 34 53 W |
| Joseph Island | Island | 2 | Kent | 39 08 37 N | 075 30 41 W |
| Joseph M McVey Elementary School | School | 29 | New Castle | 39 39 20 N | 075 44 54 W |
| Josephs Airport | Airport | 12 | Sussex | 38 38 15 N | 075 21 19 W |
| Joshia Cove | Bay | 0 | Sussex | 38 34 45 N | 075 04 24 W |
| Joshia Prong | Bay | 0 | Sussex | 38 35 01 N | 075 06 28 W |
| Joshua Fisher House (historical) | Building | 10 | Sussex | 38 43 31 N | 075 14 49 W |
| Joy Beach | Beach | 5 | Sussex | 38 40 44 N | 075 08 09 W |
| Joy Run | Stream | | New Castle | 39 32 28 N | 075 41 25 W |
| Kawan Acres | Populated Place | 12 | Sussex | 38 39 34 N | 075 17 55 W |
| Keen-Wik | Populated Place | 0 | Sussex | 38 27 38 N | 075 05 25 W |
| Keeney | Populated Place | 20 | New Castle | 39 37 08 N | 075 42 12 W |
| Keenwik Sound | Populated Place | 0 | Sussex | 38 28 13 N | 075 06 23 W |
| Keenwik West | Populated Place | 0 | Sussex | 38 28 15 N | 075 06 01 W |
| Kells Park | Park | 30 | New Castle | 39 40 27 N | 075 44 46 W |
| Kelly Island | Island | 0 | Kent | 39 12 12 N | 075 23 55 W |
| Kellys Ditch | Gut | 0 | Kent | 39 11 19 N | 075 24 56 W |
| Kenmore Park | Populated Place | 6 | Sussex | 38 39 30 N | 075 34 39 W |
| Kent Acres | Populated Place | 10 | Kent | 39 07 54 N | 075 31 30 W |
| Kent Center Vocational Technical High School | School | 17 | Kent | 39 04 21 N | 075 32 46 W |
| Kent Christian Academy | School | 12 | Kent | 39 11 37 N | 075 32 54 W |
| Kent County | Civil | 12 | Kent | 39 05 00 N | 075 32 59 W |
| Kent County Orthopedic School | School | 14 | Kent | 39 09 35 N | 075 32 22 W |
| Kent County Sewer Treatment Plant | Locale | 7 | Kent | 38 59 40 N | 075 26 26 W |
| Kent General Hospital | Hospital | 9 | Kent | 39 09 03 N | 075 31 23 W |
| Kent Island | Island | 0 | Kent | 39 13 48 N | 075 25 35 W |
| Kent North Vocational Technical High School | School | 11 | Kent | 39 11 37 N | 075 33 54 W |
| Kent Swim Club | Locale | 17 | Kent | 39 09 55 N | 075 33 33 W |
| Kent-Sussex Line Branch | Stream | | Kent | 38 50 08 N | 075 33 16 W |
| Kentmere | Populated Place | 68 | New Castle | 39 46 00 N | 075 33 41 W |
| Kenton | Populated Place | 18 | Kent | 39 13 39 N | 075 39 47 W |
| Kenton Church | Church | 19 | Kent | 39 13 58 N | 075 40 54 W |
| Kenton Hundred | Civil | 19 | Kent | 39 12 30 N | 075 41 59 W |
| Kenton Mennonite Church | Church | 18 | Kent | 39 13 57 N | 075 40 54 W |
| Kenton United Methodist Church | Church | 19 | Kent | 39 13 30 N | 075 39 60 W |
| Kerseys Evergreen Acres | Populated Place | 8 | Sussex | 38 33 51 N | 075 16 38 W |
| Kershaw Acres | Populated Place | 104 | New Castle | 39 49 02 N | 075 30 49 W |
| Keystone | Populated Place | 28 | New Castle | 39 43 35 N | 075 36 19 W |
| Kiamensi | Populated Place | 21 | New Castle | 39 43 25 N | 075 38 24 W |
| Kiamensi Gardens | Populated Place | 15 | New Castle | 39 43 25 N | 075 38 14 W |
| Kiamensi Heights | Populated Place | 9 | New Castle | 39 43 10 N | 075 37 59 W |
| Kildee Point | Cape | 2 | Sussex | 38 33 49 N | 075 12 32 W |
| Killen Pond | Reservoir | 5 | Kent | 38 58 53 N | 075 31 48 W |
| Killen Pond Dam | Dam | 5 | Kent | 38 58 53 N | 075 31 48 W |
| Killens Addition (subdivision) | Populated Place | 5 | Sussex | 38 42 06 N | 075 04 53 W |
| Killens Pond State Park | Park | 12 | Kent | 38 59 00 N | 075 32 24 W |
| Kimberton (subdivision) | Populated Place | 29 | New Castle | 39 40 34 N | 075 43 40 W |
| Kimbowrosa Farm Airport | Airport | 10 | Kent | 38 58 00 N | 075 27 59 W |
| Kingdom Hall | Church | 14 | New Castle | 39 25 57 N | 075 42 24 W |
| Kingdom Hall of Jehovahs Witnesses | Church | 14 | Kent | 39 10 23 N | 075 33 24 W |
| Kingdom Hall of Jehovahs Witnesses | Church | 10 | Sussex | 38 36 09 N | 075 35 30 W |
| Kingdom Hall of Jehovahs Witnesses | Church | 13 | Sussex | 38 42 08 N | 075 21 34 W |
| Kings Assembly of God Church | Church | 23 | New Castle | 39 43 21 N | 075 36 54 W |
| Kings Causeway Branch | Stream | | Kent | 38 57 39 N | 075 22 40 W |
| Kings Church | Church | 12 | Sussex | 38 30 28 N | 075 30 58 W |
| Kings Cliff Mobile Home Park | Populated Place | 11 | Kent | 39 08 20 N | 075 29 47 W |
| Kings Croft | Populated Place | 21 | New Castle | 39 37 12 N | 075 39 58 W |
| Kings Crossroads | Populated Place | 13 | Sussex | 38 44 46 N | 075 27 11 W |