8 cities
| City | County | 2025 Pop. ↓ |
|---|---|---|
| Bear | New Castle County | 23,995 |
| Brookside | New Castle County | 14,325 |
| Bridgeville | Sussex County | 2,992 |
| Blades | Sussex County | 1,367 |
| Bellefonte | New Castle County | 1,255 |
| Bethany Beach | Sussex County | 1,114 |
| Bowers | Kent County | 288 |
| Bethel | Sussex County | 274 |