ZIP Codes in Wilmington, DE
Wilmington uses 10 ZIP codes, all in New Castle County. Pick one below for details, or look up the full nine-digit ZIP+4 for a specific street address.
All 10 Wilmington ZIP codes
| ZIP | Type | County | Population |
|---|---|---|---|
| 19801 | standard | New Castle | 16,327 |
| 19802 | standard | New Castle | 26,051 |
| 19803 | standard | New Castle | 22,279 |
| 19804 | standard | New Castle | 18,779 |
| 19805 | standard | New Castle | 41,402 |
| 19806 | standard | New Castle | 9,777 |
| 19807 | standard | New Castle | 7,815 |
| 19808 | standard | New Castle | 39,082 |
| 19809 | standard | New Castle | 14,311 |
| 19810 | standard | New Castle | 26,530 |
Finding a ZIP+4 in Wilmington
Knowing which of these 10 ZIP codes covers an address only gets you partway. The four-digit extension identifies the specific delivery point — typically one side of one block. Two houses facing each other on the same Wilmington street almost always have different ZIP+4 codes even though they share all five leading digits.
Appending ZIP+4 to a mailing list?
Upload a CSV of Wilmington addresses and download it complete.