03837 ZIP Code — Gilmanton Iron Works, NH

Belknap County, New Hampshire

ZIP code 03837 is located in Gilmanton Iron Works, New Hampshire, within Belknap County. It covers approximately 19.97 square miles and serves a population of 1,622 residents. This is a standard ZIP code in the Eastern (ET) timezone, served by area code 603.

About ZIP code 03837

The housing stock consists of predominantly single-family detached homes. Most homes were built in the pre-1940, giving the area an established character. Median home value is $319,600. Owner-occupancy is high at 94%, well above the national average.

Median household income is $110,562. 39% 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 32 minutes is near the national average.

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

Notable community characteristics include a notable veteran presence at 12% of civilians, above the national average of 7%.

Overall, ZIP code 03837 reflects a community defined by a strong veteran community, high homeownership, and a significant Social Security-dependent population.

1,622

population

19.97

sq mi land

Standard

ZIP type

Eastern (ET)

timezone

03837 ZIP code map

Cities in ZIP code 03837

Below are the cities the US Postal Service accepts for ZIP code 03837. Using any city not on this list may result in mail delivery delays.

City	Status
Gilmanton Iron Works	Acceptable
Gilmanton Iron Works	Preferred

Nearby ZIP codes

03237 Gilmanton (4.5 mi) 03809 Alton (5.3 mi) 03225 Center Barnstead (5.4 mi) 03810 Alton Bay (6.2 mi) 03263 Pittsfield (7.7 mi) 03218 Barnstead (7.9 mi) 03855 New Durham (8.7 mi) 03220 Belmont (8.8 mi) 03835 Farmington (12.2 mi) 03884 Strafford (12.5 mi) 03224 Canterbury (13.1 mi) 03276 Tilton (13.2 mi)

Demographics updated 05/2026

Population
Total population	1,622
Population density	81 / sq mi
State FIPS	33
County FIPS	001

Geography
Land area	19.97 sq mi
Water area	0.67 sq mi
Latitude	43.4185
Longitude	-71.3063
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	23.0%	36.9%	31.0%
$50k – $100k	46.0%	31.7%	31.2%
$100k – $200k	29.1%	25.5%	28.1%
Over $200k	1.9%	5.9%	9.7%

Demographics & statistics

1,622

Population

People per sq mi

46.9

Median age

$110,562

Median household income

$44,691

Per capita income

$319,600

Median home value

Median monthly rent

94.2%

Home ownership

16.5%

Poverty rate

1.2%

Unemployment

892

Housing units

37.3%

Bachelor's or higher

Age distribution

Male Female

Under 5

5–9

10–14

15–19

20–24

119

25–34

116

35–44

45–54

55–59

138

60–64

111

65–74

75–84

85+

← Male

Female →

Age summary

Group	Count	%
Under 18	309	19.1%
18 and over	1,313	80.9%
65 and over	303	18.7%
Median age	46.9 years

Race & ethnicity

White 97.5%

Black or African American 2.1%

Two or more races 0.4%

Group	Count	%
White	1,582	97.5%
Black or African American	34	2.1%
Two or more races	6	0.4%

Household income

Income range	This ZIP	County avg	State avg
Under $50k	23.0%	36.9%	31.0%
$50k – $100k	46.0%	31.7%	31.2%
$100k – $200k	29.1%	25.5%	28.1%
Over $200k	1.9%	5.9%	9.7%

Under $10k 4.6%

$10k–$15k 5.4%

$15k–$25k 9.7%

$25k–$35k 3.2%

$35k–$50k 2.2%

$50k–$75k 9.7%

$75k–$100k 10.6%

$100k–$150k 32.9%

$150k–$200k 11.2%

$200k+ 10.6%

Range	% of households
Under $10k	4.6%
$10k–$15k	5.4%
$15k–$25k	9.7%
$25k–$35k	3.2%
$35k–$50k	2.2%
$50k–$75k	9.7%
$75k–$100k	10.6%
$100k–$150k	32.9%
$150k–$200k	11.2%
$200k+	10.6%
Median income	$110,562

Housing

Home values

Under $50k 4.0%

$150k–$200k 2.9%

$200k–$300k 38.3%

$300k–$500k 46.3%

$500k–$1M 8.5%

Housing overview

Metric	Value
Median home value	$319,600
Median rent / month	$0
Owner occupied	94.2%
Renter occupied	5.8%
Vacant	26.0%
Single-family detached	95.8%
Large apartment buildings	0.0%
Mobile homes	0.0%
Median rooms	5.9
Avg household size (owned)	2.38

Year built

Era	%
2020 or later	0.0%
2010–2019	2.6%
2000–2009	23.2%
1990–1999	13.9%
1980–1989	14.1%
1970–1979	11.8%
1960–1969	2.0%
1950–1959	5.9%
1940–1949	1.3%
1939 or earlier	25.2%

Bedrooms

Size	% of units
No bedroom (studio)	2.6%
1 bedroom	4.3%
2 bedrooms	21.1%
3 bedrooms	60.8%
4 bedrooms	5.8%
5+ bedrooms	5.4%

Vehicles per household

Vehicles	% of households
No vehicle	0.0%
1 vehicle	27.5%
2 vehicles	39.0%
3 or more	33.5%

Heating fuel

Fuel type	%
Electricity	1.6%
Propane / LP gas	17.0%
Fuel oil	59.1%
Wood	18.1%

Households & families

Household type	Count	%
Married-couple family	357	51.7%
Cohabiting couple	0	0.0%
Male householder, no spouse	211	30.6%
Female householder, no spouse	122	17.7%
Households with children under 18	171	24.8%
Households with seniors (65+)	257	37.2%
Average household size	2.35

Marital status

Status	Male	Female
Never married	9.8%	9.7%
Married	63.7%	63.6%
Separated	0.0%	1.3%
Widowed	7.6%	9.2%
Divorced	18.8%	16.2%

Education

Less than 9th grade 5.0%

Some HS, no diploma 2.6%

HS graduate 19.0%

Some college, no degree 24.2%

Associate's degree 11.9%

Bachelor's degree 22.0%

Graduate / professional 15.2%

Metric	%
HS diploma or higher	92.4%
Bachelor's or higher	37.3%

School enrollment (ages 3–17)

Type	Count	%
Nursery / preschool	47	20.3%
Kindergarten	0	0.0%
Elementary school	164	70.7%
High school	8	3.4%
College / grad school	13	5.6%

Employment

Industry of employment

Education & healthcare 31.8%

Professional & management 14.2%

Manufacturing 13.1%

Wholesale trade 9.8%

Retail trade 6.8%

Public administration 6.0%

Construction 5.8%

Arts, food & hospitality 4.5%

Other services 4.2%

Information 2.0%

Transportation & utilities 1.9%

Occupation

Category	%
Management, business & arts	49.4%
Service	13.5%
Sales & office	24.8%
Natural resources & construction	8.6%
Production & transportation	3.8%

Employment type

Type	%
Private sector	72.2%
Government	9.1%
Self-employed	18.7%
Unpaid family workers	0.0%

Commute

Method	%
Drive alone	82.2%
Carpool	5.6%
Public transit	0.0%
Walk	2.0%
Work from home	10.2%
Other means	0.0%
Avg commute (minutes)	31.9

Poverty

All people 16.5%

Under 18 years 33.3%

18 and over 12.6%

Married-couple families 3.4%

Female-led households 68.6%

Income support

Source	% of households
Social Security	38.8%
Retirement income	27.2%
Supplemental Security	3.3%
Cash public assistance	0.0%
Food stamps / SNAP	8.4%

Health indicators

Condition	%
Obesity	35.4%
High blood pressure	30.4%
High cholesterol	31.1%
Diabetes	8.5%
Heart disease	5.5%
Stroke	2.5%
Asthma	10.8%
Arthritis	24.5%
Kidney disease	2.4%
Pulmonary disease	6.3%
Cancer	6.3%

Behavior / access	%
Smoking	16.9%
Binge drinking	18.9%
No physical activity	20.4%
Less than 7 hrs sleep	31.6%
Depression	21.2%
Fair or poor health	11.6%
Poor mental health	14.5%
Poor physical health	9.8%
No health insurance	10.3%
Visited doctor (checkup)	70.9%
Visited dentist	66.6%
Cholesterol screening	90.9%
Teeth loss	10.9%

Veterans & disability

Veterans	Count	%
Civilian veterans	152	11.6%

Disability	%
Any disability	11.3%
Under 18	0.0%
18–64 years	9.9%
65 and over	27.4%

Health insurance coverage

Type	%
Private insurance	83.0%
Public insurance	29.8%
No insurance	2.7%
Uninsured under 19	3.9%

Language & origin

Language spoken at home (age 5+)

Language	Count	%
English only	1,485	91.6%
Spanish	41	2.8%
Other Indo-European	0	0.0%
Asian & Pacific Islander	41	2.8%
Other languages	0	0.0%

Place of birth & citizenship

Origin	Count	%
Native born (US)	1,527	94.1%
Born in same state	1,511	93.2%
Born in different state	565	34.8%
Foreign born	16	1.0%
Naturalized citizen	95	5.9%
Not a US citizen	46	48.4%

Ancestry

Ancestry	Count	%
French	303	18.7%
Italian	254	15.7%
German	157	9.7%

Ancestry	Count	%
Arab	111	6.8%
English	10	0.6%
Dutch	9	0.6%

Technology access

Metric	% of households
Computer access	42.5%
Internet access	95.2%

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

Frequently asked questions about ZIP code 03837

What city is ZIP code 03837 in?

ZIP code 03837 is primarily assigned to Gilmanton Iron Works, New Hampshire.

What county is ZIP code 03837 in?

ZIP code 03837 falls within Belknap County, New Hampshire.

Is ZIP code 03837 mostly owner-occupied?

94% of occupied units in ZIP code 03837 are owner-occupied, well above the national average.

What is the poverty rate in ZIP code 03837?

17% of residents in ZIP code 03837 live below the poverty line, above the national average.

Does ZIP code 03837 have a large retiree population?

39% of households in ZIP code 03837 receive Social Security income, suggesting a significant retiree or disability population.

Does ZIP code 03837 have a large veteran population?

12% of civilians in ZIP code 03837 are veterans, above the national average of ~7%.

What timezone is ZIP code 03837 in?

ZIP code 03837 observes the EST timezone.