Allenstown is a town in Merrimack County, New Hampshire, home to about 4,743 people across 20 square miles. It has no ZIP code of its own: it’s part of 03275.
Homes sold for a median of $284 per square foot in the three months ending August 2026, a seller’s market.
Mostly Pembroke; part is in Allenstown
Each card is that ZIP code’s whole market, including any part outside Allenstown. Seller’s market: under 4 months of supply; buyer’s market: over 6. Methodology
We’re writing up Allenstown’s story and what everyday life there is like, for people thinking about moving in.
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| Nearest major airport | Boston Logan International Airport (BOS)59 miles away |
|---|---|
| Closer regional airport | Manchester-Boston Regional Airport (MHT)16 miles away |
| Nearest city of 250,000+ | Boston, MA61 miles away |
| Nearest city of 1 million+ | New York, NY216 miles away |
Straight-line distances from the center of Allenstown; 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.
Allenstown had 4,707 residents in the 2020 census, down 3% since 2000.
It’s the 80th largest of 242 towns in New Hampshire by population.
Merrimack County grew from 52,430 residents in 1900 to 153,808 in 2020.
Merrimack 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 13°F. About 41.9 inches of rain and melted snow fall in a typical year, with about 68 inches of snow.
Source: NOAA 1991–2020 climate normals, Concord Muni Ap, NH weather station (5 miles away).
62,841 jobs at 4,213 businesses in Merrimack County. The biggest industries by employees:
Source: U.S. Census Bureau County Business Patterns 2023 (private employers; jobs counted where people work).
50 doctors and other health care providers list an office in Allenstown.
Nearest hospitals
Providers with an office here
| Primary care doctors | 6 |
|---|---|
| Dentists | 8 |
| Nurse practitioners and physician assistants | 11 |
| Mental health providers | 14 |
| Physical and occupational therapists | 8 |
| Chiropractors | 3 |
| Pharmacies | 2 |
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 (8 nearby)
Grocery stores (1 nearby)
Pharmacies
Libraries (2 nearby)
Museums
Theaters and performance venues
Counts are within about 3 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 1831.
Source: Wikidata (wikidata.org), the free knowledge base; people are listed by place of birth.
Public schools here are run by Allenstown School District, Pembroke School District, Strong Foundations Charter School. Check each district’s attendance zones for a specific address.
| School | Grades | Students | Type | Distance |
|---|---|---|---|---|
| Allenstown Community SchoolAllenstown | K–8 | 348 | Public | 1.5 mi |
| Pembroke Hill SchoolPembroke | K–4 | 312 | Public | 2.3 mi |
| Strong Foundations Charter SchoolPembroke | K–8 | 337 | Charter | 4.1 mi |
| Three Rivers SchoolPembroke | 5–8 | 289 | Public | 2.0 mi |
| Pembroke AcademyPembroke | 9–12 | 744 | Public | 2.2 mi |
| School | Grades | Students | Affiliation | Distance |
|---|---|---|---|---|
| Green Valley SchoolPembroke | Pre-K–8 | 53 | Nonsectarian | 2.5 mi |
| Pine Haven BoycenterAllenstown | 1–8 | 20 | Other religious | 1.7 mi |
Source: U.S. Department of Education, NCES: Common Core of Data (2024-2025) for public schools; Private School Universe Survey (2023-2024) for private schools. Listed by address; we don’t rate schools.
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Shares ZIP codes with Pembroke.
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.