City | Rank | County | 2024 Pop. |
|---|---|---|---|
| Wilmington | 1 | New Castle County | 71,954 |
| Newark | 2 | New Castle County | 30,025 |
| Bear | 3 | New Castle County | 23,686 |
| Glasgow | 4 | New Castle County | 15,589 |
| Brookside | 5 | New Castle County | 14,327 |
| Hockessin | 6 | New Castle County | 13,936 |
| Pike Creek Valley | 7 | New Castle County | 11,491 |
| Claymont | 8 | New Castle County | 10,514 |
| North Star | 9 | New Castle County | 8,435 |
| Wilmington Manor | 10 | New Castle County | 8,322 |
| Pike Creek | 11 | New Castle County | 6,821 |
| Edgemoor | 12 | New Castle County | 6,620 |
| Elsmere | 13 | New Castle County | 6,134 |
| New Castle | 14 | New Castle County | 5,552 |
| Greenville | 15 | New Castle County | 2,907 |
| Delaware City | 16 | New Castle County | 1,911 |
| St. Georges | 17 | New Castle County | 1,521 |
| Bellefonte | 18 | New Castle County | 1,235 |
| Newport | 19 | New Castle County | 892 |
| Arden | 20 | New Castle County | 434 |
| Ardentown | 21 | New Castle County | 254 |
| Ardencroft | 22 | New Castle County | 229 |
| Port Penn | 23 | New Castle County | 161 |