Newmarket is a town in Rockingham County, New Hampshire, home to about 9,463 people across 13 square miles. Its ZIP code is 03857.
Homes sold for a median of $322 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 Newmarket. Seller’s market: under 4 months of supply; buyer’s market: over 6. Methodology
We’re writing up Newmarket’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)49 miles away |
|---|---|
| Closer regional airport | Portsmouth International Airport at Pease (PSM)7 miles away |
| Nearest city of 250,000+ | Boston, MA51 miles away |
| Nearest city of 1 million+ | New York, NY226 miles away |
Straight-line distances from the center of Newmarket; 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.
Newmarket had 9,430 residents in the 2020 census, up 17% since 2000.
It’s the 31st 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 14°F. About 47.2 inches of rain and melted snow fall in a typical year.
Source: NOAA 1991–2020 climate normals, Durham 2 Ssw, NH weather station (3 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).
60 doctors and other health care providers list an office in Newmarket.
Nearest hospitals
Providers with an office here
| Primary care doctors | 8 |
|---|---|
| Specialist doctors | 2 |
| Dentists | 5 |
| Nurse practitioners and physician assistants | 18 |
| Mental health providers | 17 |
| Physical and occupational therapists | 5 |
| Chiropractors | 5 |
| 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 (4 nearby)
Grocery stores (1 nearby)
Pharmacies
Libraries (1 nearby)
Museums (1 nearby)
Theaters and performance venues (1 nearby)
Counts are within about 2.5 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 1727.
Source: Wikidata (wikidata.org), the free knowledge base; people are listed by place of birth.
Public schools here are run by Newmarket School District. Check each district’s attendance zones for a specific address.
| School | Grades | Students | Type | Distance |
|---|---|---|---|---|
| Newmarket Elementary SchoolNewmarket | Pre-K–5 | 474 | Public | 0.2 mi |
| Newmarket Jr.-Sr. High (Elem)Newmarket | 6–8 | 225 | Public | 0.5 mi |
| Newmarket Jr.-Sr. High SchoolNewmarket | 9–13 | 274 | Public | 0.5 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.