New Castle County, DE ZIP codes
There are 52 ZIP codes in New Castle County, DE, in 17 towns, from 19701 to 19899. The largest are 19720 (New Castle), 19702 (Newark) and 19709 (Middletown).
The county seat is Wilmington.
- ZIP codes
- 52
- Towns
- 17
- County seat
- Wilmington
- County FIPS
10003- State
- Delaware
- Population
- 577,961
- Median household income
- $91,166
- Land area
- 426 sq mi
- Area code
- 302
- Metro area
- Philadelphia-Camden-Wilmington
New Castle County ZIP codes by town
Each ZIP code is listed under the county most of its land lies in and the town the Postal Service names it for; a ZIP code's own page shows exactly how it is split.
Map of New Castle County ZIP codes
The ZIP codes of New Castle County, shaded. Outlines are Census ZIP Code Tabulation Areas (2020), which approximate the mail routes; PO-box and single-address codes have no area and are not drawn. Click any area to open its ZIP code.
New Castle County in numbers
About 577,961 people live in New Castle County, in 224,173 households, the most populous of Delaware's 3 counties. The median household income is $91,166 a year, 7% above the Delaware median of $84,954 (US: $80,734). The median owner-occupied home is valued at $352,200 (about the same as the Delaware median), and median gross rent is $1,448 a month. The median age is 39.3; 39.7% of adults 25 and over hold a bachelor's degree or higher (35.8% across Delaware); the average commute takes 25 minutes.
| Population | 577,961 |
|---|---|
| Households | 224,173 |
| Median age | 39.3 |
| Median household income | $91,166 |
| Median home value | $352,200 |
| Median gross rent | $1,448 |
| Bachelor's degree or higher | 39.7% |
| Mean commute | 25.3 min |
| Population density | 1,356 / sq mi |
U.S. Census Bureau, American Community Survey 2020–2024 5-year estimates. Survey estimates carry margins of error, wider for small places. Sources and methods.
Largest towns in New Castle County
| Town | ZIP codes | Population |
|---|---|---|
| Wilmington | 25 | 71,727 |
| Newark | 10 | 30,330 |
| Middletown | 1 | 24,661 |
| Bear | 1 | 22,370 |
| Hockessin | 1 | 13,439 |
| Claymont | 1 | 8,786 |
| New Castle | 3 | 5,579 |
| Townsend | 1 | 2,832 |
| Delaware City | 1 | 1,950 |
| St. Georges | 1 | 1,530 |
| Port Penn | 1 | 592 |
| Odessa | 1 | 409 |
| Yorklyn | 1 | 127 |
| Rockland | 1 | 89 |
Population of the census place of that name where there is one, otherwise of the ZIP codes the Postal Service addresses by it. A town's ZIP codes can reach past the county line.
Neighbouring counties
Counties that share a ZIP code with New Castle County.
Not sure you are in New Castle County? What county am I in? answers from your location, near a county line included.
Every ZIP code in New Castle County, with figures
| ZIP | City | Type | Population | Median income | Median home |
|---|---|---|---|---|---|
19701 | Bear , DE | Standard | 42,984 | $111,198 | $372,500 |
19702 | Newark , DE | Standard | 55,683 | $92,446 | $346,100 |
19703 | Claymont , DE | Standard | 15,460 | $76,939 | $284,700 |
19706 | Delaware City , DE | Standard | 2,038 | $83,681 | $263,000 |
19707 | Hockessin , DE | Standard | 17,376 | $172,696 | $556,600 |
19708 | Kirkwood , DE | No street area | — | — | — |
19709 | Middletown , DE | Standard | 53,234 | $132,956 | $470,900 |
19710 | Montchanin , DE | Standard | 0 | — | — |
19711 | Newark , DE | Standard | 49,432 | $95,403 | $398,900 |
19712 | Newark , DE | No street area | — | — | — |
19713 | Newark , DE | Standard | 30,747 | $76,493 | $292,600 |
19714 | Newark , DE | No street area | — | — | — |
19715 | Newark , DE | No street area | — | — | — |
19716 | Newark , DE | Standard | 0 | — | — |
19717 | Newark , DE | Standard | 6,036 | — | — |
19718 | Newark , DE | No street area | — | — | — |
19720 | New Castle , DE | Standard | 62,392 | $75,403 | $265,000 |
19721 | New Castle , DE | No street area | — | — | — |
19725 | Newark , DE | No street area | — | — | — |
19726 | New Castle , DE | No street area | — | — | — |
19730 | Odessa , DE | Standard | 425 | $112,083 | $322,600 |
19731 | Port Penn , DE | Standard | 655 | $71,282 | $369,300 |
19732 | Rockland , DE | Standard | 89 | $236,000 | $581,300 |
19733 | Saint Georges , DE | Standard | 186 | $82,604 | $304,500 |
19734 | Townsend , DE | Standard | 14,214 | $127,803 | $430,700 |
19735 | Winterthur , DE | Standard | 0 | — | — |
19736 | Yorklyn , DE | Standard | 127 | — | — |
19801 | Wilmington , DE | Standard | 16,327 | $52,810 | $199,900 |
19802 | Wilmington , DE | Standard | 26,051 | $53,812 | $194,600 |
19803 | Wilmington , DE | Standard | 22,279 | $135,218 | $457,200 |
19804 | Wilmington , DE | Standard | 18,779 | $79,701 | $264,100 |
19805 | Wilmington , DE | Standard | 41,402 | $60,221 | $237,100 |
19806 | Wilmington , DE | Standard | 9,777 | $88,855 | $386,000 |
19807 | Wilmington , DE | Standard | 7,815 | $153,341 | $936,900 |
19808 | Wilmington , DE | Standard | 39,082 | $94,234 | $337,800 |
19809 | Wilmington , DE | Standard | 14,311 | $81,288 | $314,900 |
19810 | Wilmington , DE | Standard | 26,530 | $112,775 | $440,600 |
19850 | Wilmington , DE | No street area | — | — | — |
19880 | Wilmington , DE | No street area | — | — | — |
19884 | Wilmington , DE | No street area | — | — | — |
19885 | Wilmington , DE | No street area | — | — | — |
19886 | Wilmington , DE | No street area | — | — | — |
19890 | Wilmington , DE | No street area | — | — | — |
19891 | Wilmington , DE | No street area | — | — | — |
19892 | Wilmington , DE | No street area | — | — | — |
19893 | Wilmington , DE | No street area | — | — | — |
19894 | Wilmington , DE | No street area | — | — | — |
19895 | Wilmington , DE | No street area | — | — | — |
19896 | Wilmington , DE | No street area | — | — | — |
19897 | Wilmington , DE | No street area | — | — | — |
19898 | Wilmington , DE | No street area | — | — | — |
19899 | Wilmington , DE | No street area | — | — | — |
Cite this page
zipcodes.pro. “New Castle County ZIP codes.” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/state/de/county/new-castle
Underlying data is public domain or openly licensed — sources, vintages and licences.