New Castle County ZIP Codes
New Castle County is a county of Delaware.
- ZIP codes
- 52
- Cities & towns
- 17
- Area codes
- 1
- Land area
- 426 sq mi
Every ZIP code in New Castle County
| ZIP code | City |
|---|---|
| 19701 | Bear |
| 19702 | Newark |
| 19703 | Claymont |
| 19706 | Delaware City |
| 19707 | Hockessin |
| 19708 | Kirkwood |
| 19709 | Middletown |
| 19710 | Montchanin |
| 19711 | Newark |
| 19712 | Newark |
| 19713 | Newark |
| 19714 | Newark |
| 19715 | Newark |
| 19716 | Newark |
| 19717 | Newark |
| 19718 | Newark |
| 19720 | New Castle |
| 19721 | New Castle |
| 19725 | Newark |
| 19726 | New Castle |
| 19730 | Odessa |
| 19731 | Port Penn |
| 19732 | Rockland |
| 19733 | Saint Georges |
| 19734 | Townsend |
| 19735 | Winterthur |
| 19736 | Yorklyn |
| 19801 | Wilmington |
| 19802 | Wilmington |
| 19803 | Wilmington |
| 19804 | Wilmington |
| 19805 | Wilmington |
| 19806 | Wilmington |
| 19807 | Wilmington |
| 19808 | Wilmington |
| 19809 | Wilmington |
| 19810 | Wilmington |
| 19850 | Wilmington |
| 19880 | Wilmington |
| 19884 | Wilmington |
| 19885 | Wilmington |
| 19886 | Wilmington |
| 19890 | Wilmington |
| 19891 | Wilmington |
| 19892 | Wilmington |
| 19893 | Wilmington |
| 19894 | Wilmington |
| 19895 | Wilmington |
| 19896 | Wilmington |
| 19897 | Wilmington |
| 19898 | Wilmington |
| 19899 | Wilmington |
We do not publish a delivery type (standard, PO box, unique) or a neighbourhood for each ZIP. USPS delivery-type products are licensed, and no clean-rights source maps ZIP codes to neighbourhoods — so the New Castle County codes above are listed without a column we would have to invent.
Cities and towns in New Castle County
A further 9 places in New Castle County appear in the postal source without a page of its own; their codes are in the table above and each one links to its own page.
Area codes covering New Castle County
Telephone and postal boundaries are drawn by different bodies, so these codes overlap the county without matching its edges.
Where New Castle County's ZIP codes sit
- Reference points and footprint
- Not an official NANPA boundary
- Not a USPS delivery area
Scope every ZIP code recorded in New Castle County. Source GeoNames US postal codes (2026-07 postal dump), Census 2024 county Gazetteer (2024 Gazetteer) and geoinfo-dataset (full_dataset) ZIP→NPA (2018 snapshot). Updated . The outline is a convex envelope of ZIP reference points, not a jurisdiction boundary.