Every ZIP code in the United States, with weather, radar, trivia and the numbers behind it. Five digits since 1963!

ZIP stands for Zone Improvement Plan. The codes went live on July 1, 1963.The lowest ZIP code is 00501 — the IRS in Holtsville, New York.The highest ZIP code is 99950, in Ketchikan, Alaska.Type 07734 into a calculator and turn it upside down: hELLO. It is Keansburg, New Jersey.12345 belongs to one company: General Electric in Schenectady, New York.The first digit is a region: 0 is New England and New Jersey, 9 is the West Coast, Alaska and Hawaii.Mr. ZIP, the cartoon mailman, was the mascot that sold the idea to America.ZIP+4 arrived in 1983 and can narrow a ZIP down to one side of one block.A ZIP code is a mail route, not a place: plenty of them cross county and even state lines.Play ZIP Hunt: guess the secret ZIP code of the day in six tries.
zipcodes.pro — CITY/DE/NEW-CASTLE

New Castle ZIP codes, Delaware

New Castle, DE has 3 ZIP codes (19720, 19721 and 19726) and area code 302. The largest is 19720.

USPS city name
3 ZIP codes
Population
5,579
Area code
302

New Castle in numbers

About 5,579 people live in New Castle, in 2,774 households, the 21st-largest of Delaware's 79 census places. The median household income is $89,205 a year, 5% above the Delaware median of $84,954 (US: $80,734). The median owner-occupied home is valued at $285,100 (19% below the Delaware median), and median gross rent is $1,739 a month. The median age is 48.5; 33.8% of adults 25 and over hold a bachelor's degree or higher (35.8% across Delaware); the average commute takes 23 minutes.

Population5,579New Castle5,579
Households2,774New Castle2,774
Median age48.5New Castle48.5Delaware41.6US 38.9
Median household income$89,205New Castle$89,205Delaware$84,954US $80,734
Median home value$285,100New Castle$285,100Delaware$352,000US $332,700
Median gross rent$1,739New Castle$1,739Delaware$1,401US $1,413
Bachelor's degree or higher33.8%New Castle33.8%Delaware35.8%US 35.7%
Mean commute23.2 minNew Castle23.2 minDelaware26.0 minUS 26.4 min
Population density1,604 / sq miNew Castle1,604 / sq mi

U.S. Census Bureau, American Community Survey 2020–2024 5-year estimates, for the census place New Castle city. Survey estimates carry margins of error, wider for small places. Sources and methods.

ZIP codes addressed as New Castle

ZIP codes with the USPS city name New Castle
ZIP City Type Population Median income Median home
19720 New Castle , DE Standard 62,392 $75,403 $265,000
19721 New Castle , DE No street area — — —
19726 New Castle , DE No street area — — —

Map of New Castle ZIP codes

197201972119726

The ZIP codes of New Castle, DE, 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.

Towns near New Castle

The nearest larger towns are Wilmington Manor (8,214 people, 1.5 mi), Pennsville, NJ (12,233 people, 3.8 mi) and Wilmington (71,727 people, 4.9 mi).

Towns near New Castle
TownPopulationDistance
Wilmington Manor 8,214 1.5 mi
Pennsville, NJ 12,233 3.8 mi
Wilmington 71,727 4.9 mi
Elsmere 6,203 5.0 mi
Carneys Point, NJ 8,050 5.8 mi
Penns Grove, NJ 4,882 6.5 mi
Edgemoor 6,349 6.6 mi
Bear 22,370 7.0 mi
Brookside 15,115 7.5 mi
Greenville 3,713 7.5 mi
Pike Creek Valley 12,431 8.1 mi
Salem, NJ 5,322 8.6 mi
Pike Creek 7,129 8.7 mi
Hockessin 13,439 9.9 mi

More nearby: every ZIP code in New Castle County · Delaware ZIP codes

Cite this page

zipcodes.pro. “New Castle, DE ZIP codes.” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/city/de/new-castle

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