Residential delivery area · New Hampshire
ZIP Code 03810: Alton Bay, NH
ZIP code 03810 uses the postal name Alton Bay, New Hampshire and lies entirely in Belknap County (Census 2020 ZIP-county file). About 2,300 people live there (Census Bureau, ACS 2020-2024). Median household income is $148,261 (Census Bureau, ACS 2020-2024). Its land lies outside any incorporated or census-designated place.
- ACS2020-24
- Census2020
- FHFA2025
- ZBP2023
- IRS2022
- Town
- Alton Bay · its only residential ZIP
- County
- Belknap County
- Micro area
- Laconia, NH
- House district
- NH-1 119th Congress
- State
- New Hampshire
- Time zone
- Eastern
- Land area
- 23.6 sq mi · 98 people per sq mi
Where is ZIP code 03810?
03810 centers on 43.513°, -71.295° and covers 23.6 square miles of land plus 18.6 of water. It borders 7 ZIP codes: 03249, 03809, 03837, 03237, 03853, 03894, 03254.
The map draws ZIP code areas only. For the streets inside 03810, 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 03810 compare with the rest of Belknap County?
| Measure | 03810 | In Belknap County | In NH |
|---|---|---|---|
| People (ACS 2020-2024) | 2,314 | 11th of 14 | 137th of 247 |
| Median household income | $148k | not ranked | not ranked |
| Median home value | $569k | 1st of 14 | 17th of 191 |
03810's median household income is not ranked: its 90% margin of error (±$53,429) is more than a quarter of the figure ($148,261). Rankings use ZIP codes of 1,000 or more people living in households, with margins at most 25% of the figure.
It is denser than 53% of 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 03810?
The 2020 Census counted 2,246 people in 03810; the ACS, which samples households over 2020-2024, estimates 2,314. Between the 2010 and 2020 censuses its population grew 46.0% (its boundary stayed at least 90% the same).
- People, ACS 2020-2024
- 2,314±498 (90% margin)
- 2020 Census count
- 2,246+46.0% since 2010 (1,538)
- Households
- 826
- Median age
- 57.0
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 03810?
Of the 2,314 people the ACS estimates in 03810, 9.2% are under 18 and 29.4% are 65 or older. The largest group by race and Hispanic origin is White (not Hispanic) (95.5%).
- Under 189.2%
- 18 to 6461.5%
- 65 and older29.4%
- White, not Hispanic95.5%
- Other or two or more4.1%
- Asian, not Hispanic0.3%
- Hispanic or Latino0.0%
- Black, not Hispanic0.0%
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 03810 earn?
Median household income is $148,261 (ACS 2020-2024). It is not measurably different from 2015-2019 ($115,359 in 2024 dollars): the change is within the surveys' margins of error.
- Median household income
- $148,261±$53,429
- Income per person
- $72,017
- Below the poverty line
- 2.5%
- Unemployed (of the labor force)
- 1.1%
- Adults 25+ with a bachelor's degree
- 43.1%
- Adjusted gross income per tax return, 2022
- $146,4121,100 returns; wages 45% 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 03810?
FHFA's house price index for 03810, built from repeat sales and appraisals of the same homes, rose 168% from 2015 to 2025 and rose 85% from 2020 to 2025.
- Median home value (owners' estimate)
- $569,200
- Median gross rent
- –
- Homes owned by their occupants
- 98.5%
- Housing units
- 2,675
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 03810?
42 business establishments had a location in this ZIP code in 2023, 6 more than in 2018; the most are in accommodation and food services (ZIP Code Business Patterns).
- Accommodation and food services13
- Construction8
- Arts, entertainment, and recreation5
- Retail trade3
- Real estate and rental and leasing3
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 03810?
| ZIP | Town | People | Household income | Distance |
|---|---|---|---|---|
| 03249 | Gilford | 7,830 | $117k | 4.1 mi |
| 03809 | Alton | 3,680 | $106k | 5.8 mi |
| 03837 | Gilmanton Iron Works | 1,451 | $120k | 6.6 mi |
| 03237 | Gilmanton | 2,575 | $111k | 7.3 mi |
| 03853 | Mirror Lake | 656 | $104k | 8.7 mi |
| 03894 | Wolfeboro | 6,554 | $94k | 8.9 mi |
| 03254 | Moultonborough | 5,172 | $106k | 14.6 mi |
| 03855 | New Durham | 2,748 | $100k | 7.9 mi (near) |
| 03220 | Belmont | 7,393 | $68k | 9.8 mi (near) |
Source: PlainZIP from the Census 2020 ZCTA boundaries (shared edges) and internal points; figures ACS 2020-2024.