New Castle is a town in Westchester County, New York, home to about 18,022 people across 23 square miles. Its ZIP codes are 10514 and 10546, and parts of 10549 and 10562 are in New Castle too.
Homes sold for a median of $492 per square foot across 2 ZIP codes in the three months ending August 2026, and 1 of 2 were seller’s markets.
Mostly New Castle; also Mount Pleasant
All in New Castle
Mostly Mount Kisco; part is in New Castle
Mostly Ossining; part is in New Castle
Each card is that ZIP code’s whole market, including any part outside New Castle. Seller’s market: under 4 months of supply; buyer’s market: over 6. Methodology
We’re writing up New Castle’s story and what everyday life there is like, for people thinking about moving in.
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| Nearest major airport | LaGuardia Airport (LGA)28 miles away |
|---|---|
| Closer regional airport | Westchester County Airport (HPN)9 miles away |
| Nearest city of 250,000+ | Jersey City, NJ36 miles away |
| Nearest city of 1 million+ | New York, NY37 miles away |
Straight-line distances from the center of New Castle; driving is longer.
Source: Airports from OurAirports (scheduled passenger service); city centers and populations from the U.S. Census Bureau.
Source: Members of Congress from the congress-legislators project; districts from the Census Bureau’s relationship files; governor and mayor from Wikidata.
New Castle had 18,311 residents in the 2020 census, up 5% since 2000.
It’s the 128th largest of 1,007 towns in New York by population.
Westchester County grew from 184,257 residents in 1900 to 1,004,457 in 2020.
Westchester County, 1900–2020
Source: U.S. Census Bureau decennial censuses (counties 1900–1990 from the Bureau’s historical county file).
Average highs peak around 83°F in summer, and winter lows average 17°F. About 50.3 inches of rain and melted snow fall in a typical year, with about 40 inches of snow.
Source: NOAA 1991–2020 climate normals, Yorktown Hts 1w, NY weather station (6 miles away).
389,560 jobs at 31,174 businesses in Westchester County. The biggest industries by employees:
Source: U.S. Census Bureau County Business Patterns 2023 (private employers; jobs counted where people work).
182 doctors and other health care providers list an office in New Castle’s ZIP codes.
Nearest hospitals
Providers with an office here
| Primary care doctors | 10 |
|---|---|
| Specialist doctors | 35 |
| Dentists | 13 |
| Nurse practitioners and physician assistants | 9 |
| Mental health providers | 70 |
| Physical and occupational therapists | 39 |
| Optometrists | 3 |
| Chiropractors | 3 |
| Pharmacies | 5 |
Source: Hospitals from CMS Hospital General Information (ratings are CMS overall star ratings); straight-line distances; providers from the CMS National Plan and Provider Enumeration System (NPPES), by practice address and primary specialty.
Parks (12 nearby)
Grocery stores (4 nearby)
Pharmacies (3 nearby)
Libraries (3 nearby)
Museums
Theaters and performance venues (1 nearby)
Counts are within about 3.5 miles of the center of town.
Source: Map data © OpenStreetMap contributors (openstreetmap.org/copyright), as mapped by volunteers; it can miss places or include closed ones.
Established in 1791.
Source: Wikidata (wikidata.org), the free knowledge base; people are listed by place of birth.
Public schools here are run by Chappaqua Central School District. Check each district’s attendance zones for a specific address.
| School | Grades | Students | Type | Distance |
|---|---|---|---|---|
| Douglas G Grafflin SchoolChappaqua | Pre-K–4 | 415 | Public | 2.1 mi |
| Roaring Brook SchoolChappaqua | K–4 | 444 | Public | 0.1 mi |
| Westorchard SchoolChappaqua | K–4 | 441 | Public | 1.1 mi |
| Robert E Bell SchoolChappaqua | 5–8 | 587 | Public | 1.7 mi |
| Seven Bridges Middle SchoolChappaqua | 5–8 | 500 | Public | 1.8 mi |
| Horace Greeley High SchoolChappaqua | 9–12 | 1,122 | Public | 1.0 mi |
Source: U.S. Department of Education, NCES: Common Core of Data (2024-2025) for public schools. Listed by address; we don’t rate schools.
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Shares ZIP codes with Ossining, Mount Kisco, Bedford, Yorktown and Mount Pleasant.
Town boundaries don’t always match ZIP codes: a ZIP code can cross into neighboring towns, and a town can share a ZIP code with its neighbors. Facts describe the town itself; market figures describe whole ZIP codes.