Residential delivery area · New Hampshire
ZIP Code 03809: Alton, NH
ZIP code 03809 uses the postal name Alton, New Hampshire and lies entirely in Belknap County (Census 2020 ZIP-county file). About 3,700 people live there (Census Bureau, ACS 2020-2024). Median household income is $106,397 (Census Bureau, ACS 2020-2024). By Census place, 1% of its land lies in Alton (a census-designated place); 99% is outside any Census place.
- ACS2020-24
- Census2020
- FHFA2025
- ZBP2023
- IRS2022
- Town
- Alton · its only residential ZIP
- County
- Belknap County
- Census places
- Alton census-designated place
- Micro area
- Laconia, NH
- House district
- NH-1 119th Congress
- State
- New Hampshire
- Time zone
- Eastern
- Land area
- 40.1 sq mi · 92 people per sq mi
Where is ZIP code 03809?
03809 centers on 43.465°, -71.200° and covers 40.1 square miles of land plus 0.8 of water. It borders 5 ZIP codes: 03855, 03810, 03225, 03837, 03894.
The map draws ZIP code areas only. For the streets inside 03809, open its center on OpenStreetMap.
Source: U.S. Census Bureau, 2020 ZCTA cartographic boundaries and the 2023 Gazetteer (2020 ZCTAs); ZIP-to-county shares, Census places and House districts (119th Congress) from the Census 2020 relationship files (shares of land); metro area from the OMB delineation (July 2023); town name and time zone from simplemaps US ZIP Codes (CC BY 4.0).
How does 03809 compare with the rest of Belknap County?
| Measure | 03809 | In Belknap County | In NH |
|---|---|---|---|
| People (ACS 2020-2024) | 3,680 | 7th of 14 | 107th of 247 |
| Median household income | $106k | 6th of 9 | 71st of 158 |
| Median home value | $388k | 7th of 14 | 95th of 191 |
Its median household income is higher than in 85% of U.S. residential ZIP codes, and it is denser than 52% of all U.S. residential ZIP codes. ZIP codes at the ACS caps ($250,000 or more for household income, $2,000,000 or more for home value) share the top rank.
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B01003, B19013, B25077); ranks by PlainZIP over residential ZIP codes (ZCTAs).
How many people live in 03809?
The 2020 Census counted 3,644 people in 03809; the ACS, which samples households over 2020-2024, estimates 3,680. Between the 2010 and 2020 censuses its population fell 1.9% (its boundary stayed at least 90% the same).
- People, ACS 2020-2024
- 3,680±499 (90% margin)
- 2020 Census count
- 3,644−1.9% since 2010 (3,716)
- Households
- 1,427
- Median age
- 51.1
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B01003, B01002, B11001); 2020 Census (DHC P1); 2010 Census (SF1 P1).
Who lives in 03809?
Of the 3,680 people the ACS estimates in 03809, 16.1% are under 18 and 22.3% are 65 or older. The largest group by race and Hispanic origin is White (not Hispanic) (96.6%).
- Under 1816.1%
- 18 to 6461.6%
- 65 and older22.3%
- White, not Hispanic96.6%
- Hispanic or Latino1.1%
- Other or two or more1.1%
- Black, not Hispanic0.9%
- Asian, not Hispanic0.2%
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B01001 age by sex, B03002 Hispanic or Latino origin by race); shares of the estimated population, small ZIP codes carry wide margins.
What do households in 03809 earn?
Median household income is $106,397 (ACS 2020-2024), the 6th highest of the 9 ranked ZIP codes in Belknap County. It is not measurably different from 2015-2019 ($97,733 in 2024 dollars): the change is within the surveys' margins of error.
- Median household income
- $106,397±$24,429
- Income per person
- $44,902
- Below the poverty line
- 5.1%
- Unemployed (of the labor force)
- 3.1%
- Adults 25+ with a bachelor's degree
- 30.9%
- Adjusted gross income per tax return, 2022
- $104,0922,120 returns; wages 57% of AGI (IRS)
Source: U.S. Census Bureau, ACS 2020-2024 and 2015-2019 5-year estimates (B19013, B19301, B17001, B23025, B15003; 2015-2019 dollars converted with the BLS CPI-U, 1.22699); IRS Statistics of Income, ZIP code data, tax year 2022 (adjusted gross income per return, filed under the address on the return).
What are homes worth in 03809?
FHFA's house price index for 03809, built from repeat sales and appraisals of the same homes, rose 154% from 2015 to 2025 and rose 94% from 2020 to 2025, and moved +26.9% in 2025.
- Median home value (owners' estimate)
- $387,500
- Median gross rent
- –
- Homes owned by their occupants
- 90.9%
- Housing units
- 1,939
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B25077, B25064, B25003, B25001); FHFA House Price Index, annual five-digit ZIP, updated 2026-03-31.
What businesses are in 03809?
88 business establishments had a location in this ZIP code in 2023, 9 fewer than in 2018; the most are in construction (ZIP Code Business Patterns).
- Construction12
- Retail trade12
- Professional, scientific, and technical services11
- Other services (except public administration)10
- Administrative and support and waste management and remediation services9
- Accommodation and food services9
Source: U.S. Census Bureau, ZIP Code Business Patterns 2023 and 2018 (establishments with paid employees, by the business's ZIP code).
Which ZIP codes are next to 03809?
| ZIP | Town | People | Household income | Distance |
|---|---|---|---|---|
| 03855 | New Durham | 2,748 | $100k | 2.4 mi |
| 03810 | Alton Bay | 2,314 | $148k | 5.8 mi |
| 03225 | Center Barnstead | 3,834 | $112k | 7.3 mi |
| 03837 | Gilmanton Iron Works | 1,451 | $120k | 7.4 mi |
| 03894 | Wolfeboro | 6,554 | $94k | 10.1 mi |
| 03887 | Union | 1,739 | $92k | 6.6 mi (near) |
| 03851 | Milton | 4,333 | $93k | 9.0 mi (near) |
| 03218 | Barnstead | 1,160 | $113k | 9.6 mi (near) |
| 03249 | Gilford | 7,830 | $117k | 9.6 mi (near) |
Source: PlainZIP from the Census 2020 ZCTA boundaries (shared edges) and internal points; figures ACS 2020-2024.