Henniker is a town in Merrimack County, New Hampshire, home to about 6,197 people across 44 square miles. Its ZIP code is 03242.
Homes sold for a median of $258 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 Henniker. Seller’s market: under 4 months of supply; buyer’s market: over 6. Methodology
We’re writing up Henniker’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)70 miles away |
|---|---|
| Closer regional airport | Manchester-Boston Regional Airport (MHT)26 miles away |
| Nearest city of 250,000+ | Boston, MA71 miles away |
| Nearest city of 1 million+ | New York, NY205 miles away |
Straight-line distances from the center of Henniker; 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.
Henniker had 6,185 residents in the 2020 census, up 40% since 2000.
It’s the 57th 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 11°F. About 48.2 inches of rain and melted snow fall in a typical year.
Source: NOAA 1991–2020 climate normals, Hopkinton Lake, NH weather station (4 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).
24 doctors and other health care providers list an office in Henniker.
Nearest hospitals
Providers with an office here
| Primary care doctors | 1 |
|---|---|
| Specialist doctors | 1 |
| Dentists | 1 |
| Nurse practitioners and physician assistants | 3 |
| Mental health providers | 9 |
| Physical and occupational therapists | 7 |
| Chiropractors | 2 |
| Pharmacies | 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 (6 nearby)
Grocery stores (1 nearby)
Pharmacies (1 nearby)
Libraries (2 nearby)
Museums
Counts are within about 4.5 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.
Public schools here are run by Henniker School District. Check each district’s attendance zones for a specific address.
| School | Grades | Students | Type | Distance |
|---|---|---|---|---|
| Henniker Community SchoolHenniker | Pre-K–8 | 402 | Public | 0.4 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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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.