| City Name | County Name: | Population | Median Age |
| Bear | New Castle | 20,850 | 36.1 |
| Bellefonte | New Castle | 1,164 | 41.9 |
| Bethany Beach | Sussex | 1,245 | 67.6 |
| Blades | Sussex | 1,454 | 33.6 |
| Bridgeville | Sussex | 3,862 | 53.8 |
| Brookside | New Castle | 13,396 | 35.4 |
| Camden | Kent | 3,551 | 41.5 |
| Cheswold | Kent | 1,695 | 40.8 |
| Claymont | New Castle | 9,330 | 37.1 |
| Clayton | Kent | 3,508 | 34.5 |
| Delaware City | New Castle | 1,837 | 39.6 |
| Delmar | Sussex | 1,822 | 39.1 |
| Dover | Kent | 117,282 | 30.7 |
| Dover Base Housing | Kent | 3,614 | 24.6 |
| Edgemoor | New Castle | 6,934 | 37.1 |
| Elsmere | New Castle | 5,872 | 34.8 |
| Felton | Kent | 1,414 | 42 |
| Georgetown | Sussex | 10,638 | 32.2 |
| Glasgow | New Castle | 14,359 | 37.7 |
| Greenville | New Castle | 2,467 | 43.4 |
| Greenwood | Sussex | 1,139 | 29.9 |
| Harrington | Kent | 4,543 | 28.8 |
| Highland Acres | Kent | 3,446 | 51.1 |
| Hockessin | New Castle | 13,157 | 48.3 |
| Kent Acres | Kent | 2,519 | 32.4 |
| Laurel | Sussex | 4,356 | 22.9 |
| Lewes | Sussex | 29,187 | 66 |
| Long Neck | Sussex | 2,487 | 60.4 |
| Middletown | New Castle | 35,695 | 39.2 |
| Milford | Sussex | 22,102 | 38.3 |
| Millsboro | Sussex | 10,985 | 38.9 |
| Milton | Sussex | 3,012 | 47.4 |
| New Castle | New Castle | 5,392 | 51 |
| Newark | New Castle | 33,515 | 24.8 |
| Newport | New Castle | 1,039 | 32 |
| North Star | New Castle | 7,503 | 50.3 |
| Ocean View | Sussex | 14,360 | 59.4 |
| Pike Creek | New Castle | 7,613 | 44.9 |
| Pike Creek Valley | New Castle | 10,989 | 39.8 |
| Rehoboth Beach | Sussex | 1,546 | 64.1 |
| Rising Sun-Lebanon | Kent | 4,065 | 36.5 |
| Riverview | Kent | 2,314 | 44.4 |
| Rodney Village | Kent | 1,304 | 41.5 |
| Seaford | Sussex | 8,013 | 39 |
| Selbyville | Sussex | 2,540 | 44.6 |
| Smyrna | Kent | 11,813 | 37.6 |
| Townsend | New Castle | 2,659 | 32.5 |
| Wilmington | New Castle | 70,166 | 35.6 |
| Wilmington Manor | New Castle | 7,903 | 35.8 |
| Woodside East | Kent | 2,427 | 38.7 |
| Wyoming | Kent | 1,549 | 34.6 |