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/PA/NEW-CASTLE-NORTHWEST

New Castle Northwest ZIP codes, Pennsylvania

No ZIP code is named for New Castle Northwest, PA; addresses there use a neighbouring town's name. The ZIP code covering it is 16105. Its area codes are 724 and 878.

USPS city name
0 ZIP codes
Overlapping the city
1 more
Population
1,223
Area codes
724, 878

NANPA lists no telephone rate centre for New Castle Northwest itself, so these are the area codes of the nearest one, New Castle (0.0 miles). A town on an area-code boundary can differ from its neighbour.

New Castle Northwest in numbers

About 1,223 people live in New Castle Northwest, in 530 households. The median household income is $72,500 a year, 7% below the Pennsylvania median of $77,971 (US: $80,734). The median owner-occupied home is valued at $155,300 (39% below the Pennsylvania median). The median age is 43.2; 31.0% of adults 25 and over hold a bachelor's degree or higher (35.2% across Pennsylvania); the average commute takes 19 minutes.

Population1,223New Castle Northwest1,223
Households530New Castle Northwest530
Median age43.2New Castle Northwest43.2Pennsylvania40.9US 38.9
Median household income$72,500New Castle Northwest$72,500Pennsylvania$77,971US $80,734
Median home value$155,300New Castle Northwest$155,300Pennsylvania$254,500US $332,700
Bachelor's degree or higher31.0%New Castle Northwest31.0%Pennsylvania35.2%US 35.7%
Mean commute18.5 minNew Castle Northwest18.5 minPennsylvania26.3 minUS 26.4 min
Population density1,406 / sq miNew Castle Northwest1,406 / sq mi

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

ZIP codes covering New Castle Northwest

These ZIP codes cover part of New Castle Northwest but are addressed as somewhere else.

ZIP codes overlapping New Castle Northwest
ZIP City Type Population Median income Median home
16105 New Castle , PA Standard 15,418 $65,855 $183,500

Map of New Castle Northwest ZIP codes

16105

The ZIP codes of New Castle Northwest, PA, 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 Northwest

The nearest larger towns are Oakwood (2,253 people, 1.5 mi), New Castle (21,579 people, 1.9 mi) and Oakland (1,330 people, 2.3 mi).

Towns near New Castle Northwest
TownPopulationDistance
New Castle 21,579 1.9 mi
Ellwood City 7,532 11.7 mi
Struthers, OH 9,923 12.5 mi
Campbell, OH 7,784 12.8 mi
Hubbard, OH 7,598 14.4 mi
Farrell 4,199 15.0 mi
Hermitage 16,041 15.0 mi
Slippery Rock 3,495 15.9 mi
Youngstown, OH 59,331 16.0 mi
East Palestine, OH 4,696 16.1 mi
Sharon 12,936 16.4 mi
Slippery Rock University 2,853 16.6 mi
Grove City 7,830 16.8 mi
Sharpsville 4,187 17.6 mi

More nearby: every ZIP code in Lawrence County · Pennsylvania ZIP codes

Cite this page

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

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