New Castle is a town in Rockingham County, New Hampshire, home to about 827 people across 0.8 square miles. Its ZIP code is 03854.
Homes sold for a median of $893 per square foot in the three months ending August 2026, a seller’s market.
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.
Are you a local agent who knows New Castle well? Agents who advertise here will be able to write the guide. Advertise on OfferBacked
| Nearest major airport | Portland International Jetport (PWM)45 miles away |
|---|---|
| Closer regional airport | Portsmouth International Airport at Pease (PSM)5 miles away |
| Nearest city of 250,000+ | Boston, MA53 miles away |
| Nearest city of 1 million+ | New York, NY234 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 1,000 residents in the 2020 census, down 1% since 2000.
It’s the 201st largest of 242 towns in New Hampshire by population.
Rockingham County grew from 51,118 residents in 1900 to 314,176 in 2020.
Rockingham County, 1900–2020
Source: U.S. Census Bureau decennial censuses (counties 1900–1990 from the Bureau’s historical county file).
Average highs peak around 81°F in summer, and winter lows average 16°F. About 50.9 inches of rain and melted snow fall in a typical year, with about 65 inches of snow.
Source: NOAA 1991–2020 climate normals, Greenland, NH weather station (6 miles away).
152,257 jobs at 10,266 businesses in Rockingham County. The biggest industries by employees:
Source: U.S. Census Bureau County Business Patterns 2023 (private employers; jobs counted where people work).
3 doctors and other health care providers list an office in New Castle.
Nearest hospitals
Providers with an office here
| Primary care doctors | 1 |
|---|---|
| Specialist doctors | 1 |
| Mental health providers | 1 |
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 (2 nearby)
Grocery stores
Libraries (1 nearby)
Museums (2 nearby)
Theaters and performance venues
Counts are within about 1 mile 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.
Public schools here are run by New Castle School District. Check each district’s attendance zones for a specific address.
| School | Grades | Students | Type | Distance |
|---|---|---|---|---|
| Maude H. Trefethen SchoolNew Castle | K–6 | 33 | Public | 0.2 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.
Buying or selling around New Castle? Tell us what you need and when. No agents advertise here yet, so we’ll keep your request for up to 30 days and send it to local agents who join. No obligation, and you choose who to work with.
Loading map…
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.