New Castle County, Delaware ZIP codes
52 ZIP codes are in New Castle County, plus 3 that cross in from neighboring counties. It's part of the Philadelphia-Camden-Wilmington, PA-NJ-DE-MD metro area.
- ZIP codes
- 52
- Population in these ZIPs
- 573,431
- Avg. median income
- $95,600population-weighted
- Cities & towns
- 17
Click anywhere on the map to see which ZIP code it's in.
ZIP codes in New Castle County
| ZIP code | City | Population | Median income | Typical home value |
|---|---|---|---|---|
| 19701 | Bear | 42,984 | $111,198 | $418,800 |
| 19702 | Newark | 55,683 | $92,446 | $350,600 |
| 19703 | Claymont | 15,460 | $76,939 | $324,900 |
| 19706 | Delaware City | 2,038 | $83,681 | $293,600 |
| 19707 | Hockessin | 17,376 | $172,696 | $604,500 |
| 19708 PO Box | Kirkwood | — | — | — |
| 19709 | Middletown | 53,234 | $132,956 | $535,800 |
| 19710 | Montchanin | 0 | — | — |
| 19711 | Newark | 49,432 | $95,403 | $424,200 |
| 19712 PO Box | Newark | — | — | — |
| 19713 | Newark | 30,747 | $76,493 | $316,400 |
| 19714 PO Box | Newark | — | — | — |
| 19715 PO Box | Newark | — | — | — |
| 19716 | Newark | 0 | — | — |
| 19717 | Newark | 6,036 | — | — |
| 19718 PO Box | Newark | — | — | — |
| 19720 | New Castle | 62,392 | $75,403 | $276,600 |
| 19721 PO Box | New Castle | — | — | — |
| 19725 PO Box | Newark | — | — | — |
| 19726 PO Box | New Castle | — | — | — |
| 19730 | Odessa | 425 | $112,083 | $404,800 |
| 19731 | Port Penn | 655 | $71,282 | $292,600 |
| 19732 | Rockland | 89 | $236,000 | $753,000 |
| 19733 | Saint Georges | 186 | $82,604 | $309,700 |
| 19734 | Townsend | 14,214 | $127,803 | $486,200 |
| 19735 | Winterthur | 0 | — | — |
| 19736 | Yorklyn | 127 | — | — |
| 19801 | Wilmington | 16,327 | $52,810 | $178,400 |
| 19802 | Wilmington | 26,051 | $53,812 | $198,700 |
| 19803 | Wilmington | 22,279 | $135,218 | $513,300 |
| 19804 | Wilmington | 18,779 | $79,701 | $276,300 |
| 19805 | Wilmington | 41,402 | $60,221 | $216,100 |
| 19806 | Wilmington | 9,777 | $88,855 | $361,500 |
| 19807 | Wilmington | 7,815 | $153,341 | $1,109,400 |
| 19808 | Wilmington | 39,082 | $94,234 | $368,600 |
| 19809 | Wilmington | 14,311 | $81,288 | $319,100 |
| 19810 | Wilmington | 26,530 | $112,775 | $466,300 |
| 19850 PO Box | Wilmington | — | — | — |
| 19880 PO Box | Wilmington | — | — | — |
| 19884 PO Box | Wilmington | — | — | — |
| 19885 PO Box | Wilmington | — | — | — |
| 19886 PO Box | Wilmington | — | — | — |
| 19890 PO Box | Wilmington | — | — | — |
| 19891 PO Box | Wilmington | — | — | — |
| 19892 PO Box | Wilmington | — | — | — |
| 19893 PO Box | Wilmington | — | — | — |
| 19894 PO Box | Wilmington | — | — | — |
| 19895 PO Box | Wilmington | — | — | — |
| 19896 PO Box | Wilmington | — | — | — |
| 19897 PO Box | Wilmington | — | — | — |
| 19898 PO Box | Wilmington | — | — | — |
| 19899 PO Box | Wilmington | — | — | — |
ZIP codes partly in New Castle County
These ZIP codes are mostly in a neighboring county but cover part of New Castle County.
| ZIP code | City | State | County | Population | Median income | Typical home value |
|---|---|---|---|---|---|---|
| 19938 | Clayton | DE | Kent County | 9,561 | $99,596 | $426,700 |
| 19977 | Smyrna | DE | Kent County | 27,704 | $76,826 | $397,200 |
| 21912 | Warwick | MD | Cecil County | 1,536 | $69,868 | $579,200 |
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 and towns in New Castle County
Nearby counties
Frequently asked questions
How many ZIP codes are in New Castle County, Delaware?
52 ZIP codes are mainly in New Castle County, and 3 more ZIP codes from neighboring areas reach partly into it.
What cities are in New Castle County?
ZIP codes in New Castle County use the city names Bear, Claymont, Delaware City, Hockessin, Kirkwood, Middletown, Montchanin, New Castle, Newark, Odessa, Port Penn and Rockland and others.
What metro area is New Castle County in?
New Castle County is part of the Philadelphia-Camden-Wilmington, PA-NJ-DE-MD metropolitan statistical area.