22 ZIP Codes
| Zip Code | City | Population ↓ |
|---|---|---|
| 19966 | Millsboro | 35,884 |
| 19958 | Lewes | 31,938 |
| 19973 | Seaford | 26,834 |
| 19963 | Milford | 23,500 |
| 19947 | Georgetown | 20,760 |
| 19956 | Laurel | 16,327 |
| 19968 | Milton | 15,486 |
| 19971 | Rehoboth Beach | 14,886 |
| 19975 | Selbyville | 10,862 |
| 19933 | Bridgeville | 10,597 |
| 19945 | Frankford | 9,640 |
| 19970 | Ocean View | 8,524 |
| 19950 | Greenwood | 7,918 |
| 19940 | Delmar | 7,540 |
| 19939 | Dagsboro | 7,490 |
| 19960 | Lincoln | 6,774 |
| 19941 | Ellendale | 3,435 |
| 19930 | Bethany Beach | 3,014 |
| 19967 | Millville | 2,376 |
| 19951 | Harbeson | 2,245 |
| 19944 | Fenwick Island | 636 |
| 19931 | Bethel | 375 |
The data shown reflect ZCTAs from the US Census. As of 2025, there are 22 ZCTAs in Sussex County, Delaware (US Census).