8 cities
| City | County | 2026 Pop. ↓ |
|---|---|---|
| Bear | New Castle County | 23,350 |
| Brookside | New Castle County | 15,472 |
| Bridgeville | Sussex County | 3,076 |
| Blades | Sussex County | 1,405 |
| Bellefonte | New Castle County | 1,261 |
| Bethany Beach | Sussex County | 1,146 |
| Bowers | Kent County | 291 |
| Bethel | Sussex County | 281 |