New Castle, DE ZIP codes
New Castle, Delaware has 3 ZIP codes, including 2 PO Box ZIPs. They are in New Castle County.
- Population in these ZIPs
- 62,392
- Avg. median income
- $75,400population-weighted
- Typical home value
- $276,600population-weighted
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New Castle, DE ZIP codes list
| ZIP code | County | Population | Median income | Typical home value |
|---|---|---|---|---|
| 19720 | New Castle County | 62,392 | $75,403 | $276,600 |
| 19721 PO Box | New Castle County | — | — | — |
| 19726 PO Box | New Castle County | — | — | — |
Population and median household income: ACS 2020–2024 5-year estimates. Typical home value: Zillow Home Value Index (September 2026) where available, otherwise the ACS median owner-reported value. "PO Box" marks ZIP codes with no delivery area of their own. Methodology
Cities near New Castle
- Delaware City 3 mi
- Newark 4 mi
- Wilmington 5 mi
- Saint Georges 6 mi
- Bear 6 mi
- Port Penn 8 mi
- Middletown 10 mi
- Yorklyn 11 mi
- Rockland 12 mi
- Hockessin 12 mi
- Odessa 12 mi
- Claymont 14 mi
Frequently asked questions
What county is New Castle, Delaware in?
New Castle ZIP codes are in New Castle County.
Which New Castle ZIP codes are PO Boxes?
19721 and 19726 are PO Box or single-organization ZIP codes; they have no residential delivery area.