03237 ZIP Code — Gilmanton, NH

Belknap County, New Hampshire

ZIP code 03237 is located in Gilmanton, New Hampshire, within Belknap County. It covers approximately 37.96 square miles and serves a population of 2,338 residents. This is a standard ZIP code in the Eastern (ET) timezone, served by area code 603.

About ZIP code 03237

The housing stock consists of predominantly single-family detached homes. Most homes were built in the 1980s, giving the area an established character. Median home value is $316,000. Owner-occupancy is high at 93%, well above the national average.

Median household income is $98,542. The poverty rate of 3% is below the national average. 31% of households receive Social Security income, suggesting a notable retiree or disability population.

The dominant occupation class is management, business, and professional, with education and healthcare as the leading industry. The average commute of 33 minutes is near the national average.

Educational attainment is near the national average, with 37% of residents holding a bachelor's degree or higher.

Overall, ZIP code 03237 reflects a community defined by high homeownership and a significant Social Security-dependent population.

2,338

population

37.96

sq mi land

Standard

ZIP type

Eastern (ET)

timezone

03237 ZIP code map

Cities in ZIP code 03237

Below are the cities the US Postal Service accepts for ZIP code 03237. Using any city not on this list may result in mail delivery delays.

City	Status
Gilmanton	Preferred

Nearby ZIP codes

03220 Belmont (4.4 mi) 03837 Gilmanton Iron Works (4.5 mi) 03810 Alton Bay (7.9 mi) 03809 Alton (8.6 mi) 03276 Tilton (8.7 mi) 03225 Center Barnstead (9.5 mi) 03224 Canterbury (9.5 mi) 03263 Pittsfield (9.7 mi) 03246 Laconia (10.2 mi) 03218 Barnstead (11.1 mi) 03269 Sanbornton (12.7 mi) 03855 New Durham (12.8 mi)

Demographics updated 05/2026

Population
Total population	2,338
Population density	62 / sq mi
State FIPS	33
County FIPS	001

Geography
Land area	37.96 sq mi
Water area	1.04 sq mi
Latitude	43.4318
Longitude	-71.3947
Timezone	Eastern (ET)
Area code	603

Total population by age

Gender

Race & ethnicity

Economics updated 05/2026

Household income

Income range	This ZIP	County avg	State avg
Under $50k	28.1%	36.9%	31.0%
$50k – $100k	39.7%	31.7%	31.2%
$100k – $200k	27.9%	25.5%	28.1%
Over $200k	4.3%	5.9%	9.7%

Demographics & statistics

2,338

Population

People per sq mi

42.5

Median age

$98,542

Median household income

$46,361

Per capita income

$316,000

Median home value

Median monthly rent

92.8%

Home ownership

3.0%

Poverty rate

3.0%

Unemployment

1,275

Housing units

36.8%

Bachelor's or higher

Age distribution

Male Female

Under 5

5–9

10–14

115

15–19

112

20–24

130

25–34

128

147

35–44

144

124

45–54

122

117

55–59

115

137

60–64

134

158

65–74

154

75–84

← Male

Female →

Age summary

Group	Count	%
Under 18	512	21.9%
18 and over	1,826	78.1%
65 and over	374	16.0%
Median age	42.5 years

Race & ethnicity

White 98.9%

Two or more races 0.9%

Asian 0.2%

Group	Count	%
White	2,313	98.9%
Two or more races	20	0.9%
Asian	5	0.2%

Household income

Income range	This ZIP	County avg	State avg
Under $50k	28.1%	36.9%	31.0%
$50k – $100k	39.7%	31.7%	31.2%
$100k – $200k	27.9%	25.5%	28.1%
Over $200k	4.3%	5.9%	9.7%

$15k–$25k 3.5%

$25k–$35k 0.9%

$35k–$50k 7.2%

$50k–$75k 15.5%

$75k–$100k 24.1%

$100k–$150k 29.4%

$150k–$200k 6.9%

$200k+ 12.5%

Range	% of households
$15k–$25k	3.5%
$25k–$35k	0.9%
$35k–$50k	7.2%
$50k–$75k	15.5%
$75k–$100k	24.1%
$100k–$150k	29.4%
$150k–$200k	6.9%
$200k+	12.5%
Median income	$98,542

Housing

Home values

$100k–$150k 1.5%

$150k–$200k 4.6%

$200k–$300k 39.3%

$300k–$500k 38.6%

$500k–$1M 13.9%

$1M+ 2.1%

Housing overview

Metric	Value
Median home value	$316,000
Median rent / month	$0
Owner occupied	92.8%
Renter occupied	7.2%
Vacant	33.9%
Single-family detached	94.6%
Large apartment buildings	0.0%
Mobile homes	2.5%
Median rooms	5.6
Avg household size (owned)	2.54

Year built

Era	%
2020 or later	1.2%
2010–2019	6.7%
2000–2009	10.9%
1990–1999	11.9%
1980–1989	19.4%
1970–1979	10.8%
1960–1969	13.1%
1950–1959	16.8%
1940–1949	1.9%
1939 or earlier	7.3%

Bedrooms

Size	% of units
No bedroom (studio)	0.6%
1 bedroom	7.5%
2 bedrooms	33.2%
3 bedrooms	51.5%
4 bedrooms	4.9%
5+ bedrooms	2.3%

Vehicles per household

Vehicles	% of households
No vehicle	0.0%
1 vehicle	18.5%
2 vehicles	49.0%
3 or more	32.4%

Heating fuel

Fuel type	%
Electricity	2.5%
Propane / LP gas	20.0%
Fuel oil	53.0%
Wood	18.1%

Households & families

Household type	Count	%
Married-couple family	555	62.7%
Cohabiting couple	56	6.3%
Male householder, no spouse	134	15.1%
Female householder, no spouse	140	15.8%
Households with children under 18	285	32.2%
Households with seniors (65+)	278	31.4%
Average household size	2.64

Marital status

Status	Male	Female
Never married	26.3%	24.6%
Married	66.1%	58.0%
Separated	0.0%	0.0%
Widowed	2.4%	6.3%
Divorced	5.2%	11.0%

Education

Less than 9th grade 0.0%

Some HS, no diploma 2.5%

HS graduate 26.1%

Some college, no degree 21.0%

Associate's degree 13.6%

Bachelor's degree 18.7%

Graduate / professional 18.1%

Metric	%
HS diploma or higher	97.5%
Bachelor's or higher	36.8%

School enrollment (ages 3–17)

Type	Count	%
Nursery / preschool	35	6.4%
Kindergarten	4	0.7%
Elementary school	172	31.3%
High school	178	32.4%
College / grad school	161	29.3%

Employment

Industry of employment

Education & healthcare 20.6%

Professional & management 15.8%

Construction 10.6%

Manufacturing 9.6%

Public administration 9.3%

Retail trade 9.0%

Arts, food & hospitality 8.8%

Finance & real estate 6.8%

Other services 3.9%

Agriculture & mining 2.5%

Transportation & utilities 2.0%

Wholesale trade 0.9%

Information 0.3%

Occupation

Category	%
Management, business & arts	36.7%
Service	9.3%
Sales & office	23.6%
Natural resources & construction	15.1%
Production & transportation	15.3%

Employment type

Type	%
Private sector	75.2%
Government	21.8%
Self-employed	3.0%
Unpaid family workers	0.0%

Commute

Method	%
Drive alone	93.7%
Carpool	4.3%
Public transit	0.0%
Walk	0.0%
Work from home	2.0%
Other means	0.0%
Avg commute (minutes)	32.7

Poverty

All people 3.0%

Under 18 years 9.0%

18 and over 1.3%

Married-couple families 0.0%

Female-led households 29.6%

Income support

Source	% of households
Social Security	30.5%
Retirement income	27.9%
Supplemental Security	3.4%
Cash public assistance	1.2%
Food stamps / SNAP	0.9%

Health indicators

Condition	%
Obesity	35.5%
High blood pressure	32.4%
High cholesterol	32.8%
Diabetes	9.3%
Heart disease	6.1%
Stroke	2.7%
Asthma	10.7%
Arthritis	26.2%
Kidney disease	2.6%
Pulmonary disease	6.8%
Cancer	6.9%

Behavior / access	%
Smoking	16.8%
Binge drinking	18.3%
No physical activity	20.9%
Less than 7 hrs sleep	31.4%
Depression	20.7%
Fair or poor health	12.0%
Poor mental health	14.0%
Poor physical health	10.3%
No health insurance	9.9%
Visited doctor (checkup)	71.9%
Visited dentist	66.6%
Cholesterol screening	91.6%
Teeth loss	11.2%

Veterans & disability

Veterans	Count	%
Civilian veterans	111	6.1%

Disability	%
Any disability	9.7%
Under 18	5.1%
18–64 years	3.7%
65 and over	39.6%

Health insurance coverage

Type	%
Private insurance	81.3%
Public insurance	27.6%
No insurance	2.7%
Uninsured under 19	0.0%

Language & origin

Language spoken at home (age 5+)

Language	Count	%
English only	2,208	94.4%
Spanish	0	0.0%
Other Indo-European	0	0.0%
Asian & Pacific Islander	0	0.0%
Other languages	0	0.0%

Place of birth & citizenship

Origin	Count	%
Native born (US)	2,254	96.4%
Born in same state	2,254	96.4%
Born in different state	1,301	55.6%
Foreign born	0	0.0%
Naturalized citizen	84	3.6%
Not a US citizen	71	84.5%

Ancestry

Ancestry	Count	%
French	1,005	43%
Italian	444	19%
German	338	14.5%
Arab	235	10.1%

Ancestry	Count	%
Polish	15	0.6%
Norwegian	11	0.5%
Irish	10	0.4%

Technology access

Metric	% of households
Computer access	37.9%
Internet access	95.4%

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

Frequently asked questions about ZIP code 03237

What city is ZIP code 03237 in?

ZIP code 03237 is primarily assigned to Gilmanton, New Hampshire.

What county is ZIP code 03237 in?

ZIP code 03237 falls within Belknap County, New Hampshire.

Is ZIP code 03237 mostly owner-occupied?

93% of occupied units in ZIP code 03237 are owner-occupied, well above the national average.

What is the typical home value in ZIP code 03237?

The median home value in ZIP code 03237 is $316,000.

What is the population of ZIP code 03237?

ZIP code 03237 has an estimated population of 2,338 residents, with a density of 62 people per square mile.

What is the median household income in ZIP code 03237?

The median household income in ZIP code 03237 is $98,542, above the national median of ~$75,000.

What timezone is ZIP code 03237 in?

ZIP code 03237 observes the EST timezone.