27 cities
| City | Rank | County | 2026 Pop. ↓ |
|---|---|---|---|
| Milford | 1 | Sussex County | 15,463 |
| Seaford | 2 | Sussex County | 9,437 |
| Georgetown | 3 | Sussex County | 8,550 |
| Millsboro | 4 | Sussex County | 8,324 |
| Laurel | 5 | Sussex County | 4,644 |
| Milton | 6 | Sussex County | 3,992 |
| Lewes | 7 | Sussex County | 3,893 |
| Selbyville | 8 | Sussex County | 3,474 |
| Ocean View | 9 | Sussex County | 3,203 |
| Bridgeville | 10 | Sussex County | 3,076 |
| Long Neck | 11 | Sussex County | 2,462 |
| Delmar | 12 | Sussex County | 2,397 |
| Millville | 13 | Sussex County | 2,233 |
| Lincoln | 14 | Sussex County | 2,017 |
| Blades | 15 | Sussex County | 1,405 |
| Rehoboth Beach | 16 | Sussex County | 1,328 |
| Greenwood | 17 | Sussex County | 1,187 |
| Bethany Beach | 18 | Sussex County | 1,146 |
| Dagsboro | 19 | Sussex County | 1,045 |
| Frankford | 20 | Sussex County | 955 |
| Ellendale | 21 | Sussex County | 587 |
| South Bethany | 22 | Sussex County | 550 |
| Dewey Beach | 23 | Sussex County | 428 |
| Fenwick Island | 24 | Sussex County | 411 |
| Bethel | 25 | Sussex County | 281 |
| Henlopen Acres | 26 | Sussex County | 167 |
| Galestown | 27 | Sussex County | 115 |
Sussex County is the county generally considered as South Delaware.