Identifiers: city · town · CDP
| Rank | Community | Population |
|---|---|---|
| 1 | Dover (city), DE | 39,403 |
| 2 | Middletown (town), DE | 23,192 |
| 3 | Smyrna (town), DE | 12,883 |
| 4 | Milford (city), DE | 11,190 |
| 5 | Rising Sun-Lebanon (CDP), DE | 4,104 |
| 6 | Clayton (town), DE | 3,961 |
| 7 | Harrington (city), DE | 3,774 |
| 8 | Camden (town), DE | 3,715 |
| 9 | Highland Acres (CDP), DE | 3,492 |
| 10 | Dover Base Housing (CDP), DE | 2,810 |
| 11 | Townsend (town), DE | 2,717 |
| 12 | Woodside East (CDP), DE | 2,570 |
| 13 | Riverview (CDP), DE | 2,458 |
| 14 | Kent Acres (CDP), DE | 2,144 |
| 15 | Cheswold (town), DE | 1,923 |
| 16 | Wyoming (town), DE | 1,680 |
| 17 | Rodney Village (CDP), DE | 1,489 |
| 18 | Felton (town), DE | 1,316 |
| 19 | Frederica (town), DE | 1,073 |
| 20 | Odessa (town), DE | 366 |
Identifiers: city · town · CDP
| Rank | Community | Population |
|---|---|---|
| 1 | Dover (city), DE | 39,403 |
| 2 | Middletown (town), DE | 23,192 |
| 3 | Smyrna (town), DE | 12,883 |
| 4 | Milford (city), DE | 11,190 |
| 5 | Rising Sun-Lebanon (CDP), DE | 4,104 |
| 6 | Clayton (town), DE | 3,961 |
| 7 | Harrington (city), DE | 3,774 |
| 8 | Camden (town), DE | 3,715 |
| 9 | Highland Acres (CDP), DE | 3,492 |
| 10 | Dover Base Housing (CDP), DE | 2,810 |
| 11 | Townsend (town), DE | 2,717 |
| 12 | Woodside East (CDP), DE | 2,570 |
| 13 | Riverview (CDP), DE | 2,458 |
| 14 | Kent Acres (CDP), DE | 2,144 |
| 15 | Cheswold (town), DE | 1,923 |
| 16 | Wyoming (town), DE | 1,680 |
| 17 | Rodney Village (CDP), DE | 1,489 |
| 18 | Felton (town), DE | 1,316 |
| 19 | Frederica (town), DE | 1,073 |
| 20 | Odessa (town), DE | 366 |