Alton is a town in Belknap County, New Hampshire, home to about 5,994 people across 64 square miles. Its ZIP codes are 03809 and 03810.
Homes sold for a median of $342 per square foot across 2 ZIP codes in the three months ending August 2026, and 1 of 2 were seller’s markets.
Each card is that ZIP code’s whole market, including any part outside Alton. Seller’s market: under 4 months of supply; buyer’s market: over 6. Methodology
We’re writing up Alton’s story and what everyday life there is like, for people thinking about moving in.
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| Nearest major airport | Portland International Jetport (PWM)48 miles away |
|---|---|
| Closer regional airport | Portsmouth International Airport at Pease (PSM)34 miles away |
| Nearest city of 250,000+ | Boston, MA79 miles away |
| Nearest city of 1 million+ | New York, NY238 miles away |
Straight-line distances from the center of Alton; 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.
Alton had 5,894 residents in the 2020 census, up 31% since 2000.
It’s the 62nd largest of 242 towns in New Hampshire by population.
Belknap County grew from 19,526 residents in 1900 to 63,705 in 2020.
Belknap County, 1900–2020
Source: U.S. Census Bureau decennial censuses (counties 1900–1990 from the Bureau’s historical county file).
Average highs peak around 82°F in summer, and winter lows average 12°F. About 45.7 inches of rain and melted snow fall in a typical year, with about 62 inches of snow.
Source: NOAA 1991–2020 climate normals, Lakeport 2, NH weather station (13 miles away).
21,197 jobs at 1,905 businesses in Belknap County. The biggest industries by employees:
Source: U.S. Census Bureau County Business Patterns 2023 (private employers; jobs counted where people work).
13 doctors and other health care providers list an office in Alton’s ZIP codes.
Nearest hospitals
Providers with an office here
| Primary care doctors | 2 |
|---|---|
| Dentists | 1 |
| Nurse practitioners and physician assistants | 7 |
| Mental health providers | 2 |
| Chiropractors | 1 |
| 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 (11 nearby)
Grocery stores (1 nearby)
Libraries (3 nearby)
Museums (2 nearby)
Theaters and performance venues (1 nearby)
Counts are within about 5.5 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 1796.
Source: Wikidata (wikidata.org), the free knowledge base; people are listed by place of birth.
Public schools here are run by Alton School District, Prospect Mountain JMA School District. Check each district’s attendance zones for a specific address.
| School | Grades | Students | Type | Distance |
|---|---|---|---|---|
| Alton Central School (Elem)Alton | Pre-K–8 | 407 | Public | 1.4 mi |
| Prospect Mountain High SchoolAlton | 9–13 | 402 | Public | 2.6 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.