Identifiers: city · town · CDP
| Rank | Community | Population |
|---|---|---|
| 1 | Wilmington (city), DE | 70,898 |
| 2 | Dover (city), DE | 39,403 |
| 3 | Newark (city), DE | 30,601 |
| 4 | Middletown (town), DE | 23,192 |
| 5 | Bear (CDP), DE | 23,060 |
| 6 | Glasgow (CDP), DE | 15,288 |
| 7 | Brookside (CDP), DE | 14,974 |
| 8 | Smyrna (town), DE | 12,883 |
| 9 | Pike Creek Valley (CDP), DE | 11,692 |
| 10 | Wilmington Manor (CDP), DE | 8,162 |
| 11 | Pike Creek (CDP), DE | 7,808 |
| 12 | Edgemoor (CDP), DE | 6,635 |
| 13 | Elsmere (town), DE | 6,229 |
| 14 | New Castle (city), DE | 5,551 |
| 15 | Clayton (town), DE | 3,961 |
| 16 | Highland Acres (CDP), DE | 3,492 |
| 17 | Dover Base Housing (CDP), DE | 2,810 |
| 18 | Townsend (town), DE | 2,717 |
| 19 | Kent Acres (CDP), DE | 2,144 |
| 20 | St. Georges (CDP), DE | 1,957 |