| City | 2025 Pop. ↓ |
|---|---|
| Arden | 438 |
| Ardentown | 259 |
| Ardencroft | 235 |
| City | 2025 Pop. ↓ |
|---|---|
| Bridgeville | 2,992 |
| Blades | 1,367 |
| Bellefonte | 1,255 |
| Bethany Beach | 1,114 |
| Bowers | 288 |
| Bethel | 274 |
| City | 2025 Pop. ↓ |
|---|---|
| Dover | 40,387 |
| Delmar | 2,337 |
| Delaware City | 1,945 |
| Dagsboro | 1,016 |
| Dewey Beach | 416 |
| City | 2025 Pop. ↓ |
|---|---|
| Felton | 1,389 |
| Frederica | 1,141 |
| Frankford | 930 |
| Fenwick Island | 400 |
| Farmington | 102 |
| City | 2025 Pop. ↓ |
|---|---|
| Georgetown | 8,324 |
| Greenwood | 1,155 |
| City | 2025 Pop. ↓ |
|---|---|
| Harrington | 3,973 |
| Houston | 407 |
| Henlopen Acres | 162 |
| Hartly | 80 |
| City | 2025 Pop. ↓ |
|---|---|
| Kenton | 225 |
| City | 2025 Pop. ↓ |
|---|---|
| Laurel | 4,519 |
| Lewes | 3,797 |
| Little Creek | 205 |
| Leipsic | 188 |
| City | 2025 Pop. ↓ |
|---|---|
| Newark | 30,483 |
| New Castle | 5,758 |
| Newport | 909 |
| City | 2025 Pop. ↓ |
|---|---|
| Ocean View | 3,113 |
| Odessa | 366 |
| City | 2025 Pop. ↓ |
|---|---|
| Rehoboth Beach | 1,292 |
| City | 2025 Pop. ↓ |
|---|---|
| Smyrna | 13,415 |
| Seaford | 9,194 |
| Selbyville | 3,379 |
| South Bethany | 535 |
| Slaughter Beach | 254 |
| City | 2025 Pop. ↓ |
|---|---|
| Townsend | 2,990 |
| City | 2025 Pop. ↓ |
|---|---|
| Viola | 146 |
| City | 2025 Pop. ↓ |
|---|---|
| Wilmington | 73,759 |
| Wyoming | 1,912 |
| Woodside | 200 |