Alton Bay ZIP Codes — Belknap County, NH

There is one unique ZIP code in Alton Bay, New Hampshire and it is 03810. Area code: 603.

ZIP codes

23.58

sq mi land

18.64

sq mi water

603

area code

Alton Bay, NH ZIP code map

About Alton Bay, NH

Alton Bay is a charming community located in New Hampshire, known for its picturesque waterfront along Lake Winnipesaukee. This small yet vibrant area is part of Belknap County and offers visitors a glimpse into both local culture and natural beauty. The charm of Alton Bay lies in its serene landscape, making it a popular destination for those looking to escape the bustle of city life.

Location & geography

Alton Bay is situated in the central part of New Hampshire, nestled alongside the beautiful Lake Winnipesaukee. It is approximately 18 miles from the town of Laconia, 25 miles from Concord, and about 45 miles from Manchester, offering a peaceful retreat within easy reach of larger urban centers. The town encompasses a land area of 23.58 square miles and a water area of 18.64 square miles, providing ample space for both development and recreation.

Community & economy

The character of Alton Bay is largely defined by its scenic landscapes and recreational boating activities, making it a popular spot for both residents and tourists alike. The local economy thrives on tourism, with many seasonal businesses catering to visitors seeking outdoor experiences, including fishing, hiking, and boating. Daily life in Alton Bay is relaxed and community-oriented, often highlighted by seasonal events that foster a tight-knit atmosphere among residents.

Transportation

Alton Bay is accessible via New Hampshire Route 11, a major highway that connects the town to surrounding areas. The nearest significant airport is Laconia Municipal Airport, which is approximately 12 miles away and offers limited regional services. Public transportation options are limited, so personal vehicles are the primary means of getting around.

History

Alton Bay was initially settled in the early 18th century, establishing itself as a key locality for trade and transport along Lake Winnipesaukee. The town's growth was significantly influenced by tourism in the late 19th century, as it became a popular destination for vacationers seeking beautiful lakefront properties. Over the years, Alton Bay has retained its small-town charm while adapting to the changing dynamics of tourism and local culture.

Did you know?

One little-known fact about Alton Bay is that it is home to the iconic Alton Bay Historic District, which features several structures dating back to the 1920s and 1930s that illustrate the area’s development as a summer resort destination. Additionally, Alton Bay is known for its vibrant 4th of July celebrations, which include fireworks over the lake, drawing crowds from surrounding areas.

ZIP codes for Alton Bay, NH (1)

ZIP code	City	County	Map
03810	Alton Bay	Belknap	View map

Demographics & statistics

2,286

Population

54.2

Median age

$139,848

Median household income

$73,144

Per capita income

$511,500

Median home value

Median monthly rent

97.8%

Home ownership

1.8%

Poverty rate

1.2%

Unemployment

2,448

Housing units

36.5%

Bachelor's or higher

Age distribution

Male Female

Under 5

5–9

10–14

15–19

111

100

20–24

127

35–44

214

45–54

271

135

55–59

172

60–64

103

147

65–74

185

75–84

106

85+

← Male

Female →

Age summary

Group	Count	%
Under 18	271	11.9%
18 and over	2,015	88.1%
65 and over	607	26.6%
Median age	54.2 years

Race & ethnicity

White 92.4%

Two or more races 5.2%

Hispanic or Latino 1.3%

Black or African American 1.1%

Group	Count	%
White	2,139	92.4%
Two or more races	120	5.2%
Hispanic or Latino	29	1.3%
Black or African American	26	1.1%

Household income

$25k–$35k 11.3%

$35k–$50k 3.3%

$50k–$75k 3.8%

$75k–$100k 6.0%

$100k–$150k 35.4%

$150k–$200k 6.5%

$200k+ 33.7%

Range	% of households
$25k–$35k	11.3%
$35k–$50k	3.3%
$50k–$75k	3.8%
$75k–$100k	6.0%
$100k–$150k	35.4%
$150k–$200k	6.5%
$200k+	33.7%
Median income	$139,848

Housing

Home values

$150k–$200k 0.6%

$200k–$300k 16.1%

$300k–$500k 32.5%

$500k–$1M 35.1%

$1M+ 15.7%

Housing overview

Metric	Value
Median home value	$511,500
Median rent / month	$0
Owner occupied	97.8%
Renter occupied	2.2%
Vacant	63.9%
Single-family detached	93.4%
Large apartment buildings	0.0%
Mobile homes	1.8%
Median rooms	5.2
Avg household size (owned)	2.60

Year built

Era	%
2020 or later	0.0%
2010–2019	7.3%
2000–2009	13.8%
1990–1999	12.7%
1980–1989	8.1%
1970–1979	17.1%
1960–1969	12.4%
1950–1959	10.7%
1940–1949	4.3%
1939 or earlier	13.7%

Bedrooms

Size	% of units
No bedroom (studio)	3.4%
1 bedroom	2.8%
2 bedrooms	35.7%
3 bedrooms	40.0%
4 bedrooms	9.1%
5+ bedrooms	9.1%

Vehicles per household

Vehicles	% of households
No vehicle	0.0%
1 vehicle	4.4%
2 vehicles	39.1%
3 or more	56.5%

Heating fuel

Fuel type	%
Utility gas	1.9%
Electricity	0.7%
Propane / LP gas	20.2%
Fuel oil	63.7%
Wood	13.5%

Households & families

Household type	Count	%
Married-couple family	607	68.2%
Cohabiting couple	66	7.4%
Male householder, no spouse	72	8.1%
Female householder, no spouse	145	16.3%
Households with children under 18	220	24.7%
Households with seniors (65+)	383	43.0%
Average household size	2.56

Marital status

Status	Male	Female
Never married	18.2%	29.6%
Married	66.2%	50.3%
Separated	0.0%	0.0%
Widowed	10.0%	6.1%
Divorced	5.5%	14.0%

Education

Less than 9th grade 0.0%

Some HS, no diploma 1.9%

HS graduate 29.4%

Some college, no degree 12.7%

Associate's degree 19.5%

Bachelor's degree 28.4%

Graduate / professional 8.1%

Metric	%
HS diploma or higher	98.1%
Bachelor's or higher	36.5%

School enrollment (ages 3–17)

Type	Count	%
Nursery / preschool	0	0.0%
Kindergarten	0	0.0%
Elementary school	122	32.7%
High school	198	53.1%
College / grad school	53	14.2%

Employment

Industry of employment

Arts, food & hospitality 21.8%

Retail trade 21.3%

Education & healthcare 17.6%

Construction 12.1%

Finance & real estate 10.6%

Professional & management 8.8%

Public administration 3.0%

Other services 2.7%

Transportation & utilities 1.9%

Occupation

Category	%
Management, business & arts	45.9%
Service	30.4%
Sales & office	14.6%
Natural resources & construction	5.6%
Production & transportation	3.6%

Employment type

Type	%
Private sector	72.4%
Government	7.3%
Self-employed	19.2%
Unpaid family workers	1.2%

Commute

Method	%
Drive alone	73.1%
Carpool	9.8%
Public transit	0.0%
Walk	0.0%
Other means	1.8%
Avg commute (minutes)	34.5

Poverty

All people 1.8%

Under 18 years 0.0%

18 and over 2.1%

Married-couple families 0.0%

Female-led households 0.0%

Income support

Source	% of households
Social Security	40.4%
Retirement income	19.8%
Supplemental Security	7.1%
Cash public assistance	3.7%
Food stamps / SNAP	0.0%

Health indicators

Condition	%
High blood pressure	35.0%
High cholesterol	37.1%
Heart disease	7.0%
Stroke	2.9%
Asthma	10.3%
Arthritis	28.6%
Kidney disease	2.8%
Pulmonary disease	7.0%
Cancer	8.3%

Behavior / access	%
Binge drinking	16.7%
No physical activity	20.3%
Less than 7 hrs sleep	29.8%
Fair or poor health	11.7%
Poor mental health	12.8%
Poor physical health	10.1%
No health insurance	9.7%
Visited doctor (checkup)	73.9%
Visited dentist	69.9%
Cholesterol screening	93.3%
Teeth loss	10.0%

Veterans & disability

Veterans	Count	%
Civilian veterans	284	14.1%

Disability	%
Any disability	9.7%
Under 18	0.0%
18–64 years	6.6%
65 and over	21.3%

Health insurance coverage

Type	%
Private insurance	78.6%
Public insurance	34.0%
Uninsured under 19	0.0%

Language & origin

Language spoken at home (age 5+)

Language	Count	%
English only	2,274	99.5%
Spanish	14	0.6%
Other Indo-European	0	0.0%
Asian & Pacific Islander	14	0.6%
Other languages	0	0.0%

Place of birth & citizenship

Origin	Count	%
Native born (US)	2,278	99.7%
Born in same state	2,104	92.0%
Born in different state	972	42.5%
Foreign born	174	7.6%
Naturalized citizen	8	0.3%
Not a US citizen	8	100.0%

Ancestry

Ancestry	Count	%
Italian	351	15.4%
French	215	9.4%
Arab	99	4.3%
German	73	3.2%

Ancestry	Count	%
English	35	1.5%
Polish	17	0.7%
Norwegian	11	0.5%

Technology access

Metric	% of households
Computer access	38.9%
Internet access	100.0%

Source: U.S. Census Bureau, American Community Survey 2025 estimates.

Frequently asked questions

What ZIP codes does Alton Bay, NH have?

Alton Bay, NH has one ZIP code: 03810. Each ZIP code serves a distinct delivery area within the city and surrounding region.