22 zips
| Zip Code | City | Population ↓ |
|---|---|---|
| 19966 | Millsboro | 34,892 |
| 19958 | Lewes | 29,599 |
| 19973 | Seaford | 25,786 |
| 19963 | Milford | 22,544 |
| 19947 | Georgetown | 19,343 |
| 19956 | Laurel | 16,274 |
| 19971 | Rehoboth Beach | 15,528 |
| 19968 | Milton | 14,791 |
| 19933 | Bridgeville | 11,409 |
| 19975 | Selbyville | 10,356 |
| 19945 | Frankford | 8,917 |
| 19970 | Ocean View | 8,265 |
| 19939 | Dagsboro | 7,833 |
| 19950 | Greenwood | 7,822 |
| 19940 | Delmar | 7,108 |
| 19960 | Lincoln | 7,083 |
| 19941 | Ellendale | 3,120 |
| 19930 | Bethany Beach | 2,873 |
| 19967 | Millville | 2,093 |
| 19951 | Harbeson | 1,957 |
| 19944 | Fenwick Island | 652 |
| 19931 | Bethel | 431 |
The data shown reflect ZCTAs from the US Census. As of 2024, there are 22 ZCTAs in Sussex County, Delaware (US Census).