Newmarket ZIP Code List — Rockingham County, NH

There is one unique ZIP code in Newmarket, New Hampshire and it is 03857. Area code: 603.

ZIP codes

12.59

sq mi land

1.60

sq mi water

603

area code

Newmarket, NH ZIP code map

About Newmarket, NH

Newmarket, New Hampshire, is a picturesque town located in the southeastern part of the state. This charming community is known for its scenic landscapes and rich history. With its quaint downtown area and vibrant local culture, Newmarket is a delightful place to visit or reside.

Location & geography

Newmarket is situated in Rockingham County in New Hampshire, offering a blend of natural beauty and accessibility. It is approximately 10 miles from Exeter, 15 miles from Dover, and around 20 miles from Portsmouth, making it a convenient location for those seeking the small-town experience with access to larger urban areas. The city covers a total land area of 12.59 square miles, complemented by 1.60 square miles of water, accentuating its diverse terrain.

Community & economy

The character of Newmarket is defined by its friendly residents and strong community spirit, making it an inviting place for families and individuals alike. The local economy is supported by various industries, including retail, healthcare, and hospitality, contributing to a balanced daily life for its inhabitants. Residents enjoy a mix of outdoor activities and community events, fostering a sense of belonging and connection.

Transportation

Newmarket is accessible via major routes, including New Hampshire Route 108, which connects to neighboring towns and cities. The nearest airport is Portsmouth International Airport at Pease, located about 20 miles away, facilitating air travel for residents and visitors. Public transportation options are limited, but the community is bike-friendly and walkable.

History

Newmarket was established in the early 18th century, becoming a bustling center for the textile industry, particularly known for its mills along the Lamprey River. Key events in its history include its incorporation in 1737 and its significant role during the industrial revolution. The town's historical significance is evident in its well-preserved buildings and heritage sites.

Did you know?

One surprising fact about Newmarket is that it was originally known for its use of waterpower to drive its textile mills, showcasing the importance of the Lamprey River for industry. Additionally, the town is home to the Newmarket Public Library, which plays a significant role in the community's cultural life.

ZIP codes for Newmarket, NH (1)

ZIP code	City	County	Map
03857	Newmarket	Rockingham	View map

Demographics & statistics

9,400

Population

38.5

Median age

$98,002

Median household income

$51,411

Per capita income

$369,900

Median home value

$1,573

Median monthly rent

54.3%

Home ownership

4.0%

Poverty rate

1.5%

Unemployment

2,429

Housing units

49.6%

Bachelor's or higher

Age distribution

Male Female

232

Under 5

212

213

5–9

194

267

10–14

242

170

15–19

154

376

20–24

342

954

25–34

868

705

35–44

641

627

45–54

571

180

55–59

163

401

60–64

364

502

65–74

457

259

75–84

236

85+

← Male

Female →

Age summary

Group	Count	%
Under 18	1,575	16.8%
18 and over	7,825	83.2%
65 and over	1,524	16.2%
Median age	38.5 years

Race & ethnicity

White 91.9%

Two or more races 3.8%

Asian 1.4%

Hispanic or Latino 1.3%

Black or African American 0.9%

Other race 0.7%

Group	Count	%
White	8,754	91.9%
Two or more races	363	3.8%
Asian	130	1.4%
Hispanic or Latino	123	1.3%
Black or African American	90	0.9%
Other race	63	0.7%

Household income

Under $10k 2.3%

$15k–$25k 5.6%

$25k–$35k 5.2%

$35k–$50k 8.6%

$50k–$75k 15.3%

$75k–$100k 15.6%

$100k–$150k 23.6%

$150k–$200k 13.9%

$200k+ 9.9%

Range	% of households
Under $10k	2.3%
$15k–$25k	5.6%
$25k–$35k	5.2%
$35k–$50k	8.6%
$50k–$75k	15.3%
$75k–$100k	15.6%
$100k–$150k	23.6%
$150k–$200k	13.9%
$200k+	9.9%
Median income	$98,002

Housing

Home values

Under $50k 0.2%

$50k–$100k 0.9%

$100k–$150k 0.7%

$150k–$200k 4.8%

$200k–$300k 16.1%

$300k–$500k 59.4%

$500k–$1M 17.8%

Housing overview

Metric	Value
Median home value	$369,900
Median rent / month	$1,573
Owner occupied	54.3%
Renter occupied	45.7%
Vacant	3.4%
Single-family detached	43.6%
Large apartment buildings	20.2%
Mobile homes	2.6%
Median rooms	5.3
Avg household size (owned)	2.57

Year built

Era	%
2020 or later	0.2%
2010–2019	4.1%
2000–2009	12.5%
1990–1999	14.1%
1980–1989	26.4%
1970–1979	12.4%
1960–1969	3.6%
1950–1959	6.5%
1940–1949	0.8%
1939 or earlier	19.4%

Bedrooms

Size	% of units
No bedroom (studio)	0.6%
1 bedroom	11.6%
2 bedrooms	42.9%
3 bedrooms	34.5%
4 bedrooms	9.3%
5+ bedrooms	1.0%

Vehicles per household

Vehicles	% of households
No vehicle	1.1%
1 vehicle	33.4%
2 vehicles	51.0%
3 or more	14.5%

Heating fuel

Fuel type	%
Utility gas	5.9%
Electricity	26.3%
Propane / LP gas	21.8%
Fuel oil	41.7%
Wood	2.5%
Solar	0.2%
No fuel used	0.6%

Households & families

Household type	Count	%
Married-couple family	1,861	44.3%
Cohabiting couple	611	14.5%
Male householder, no spouse	817	19.4%
Female householder, no spouse	914	21.7%
Households with children under 18	1,001	23.8%
Households with seniors (65+)	1,046	24.9%
Average household size	2.23

Marital status

Status	Male	Female
Never married	41.1%	29.8%
Married	48.2%	50.8%
Separated	0.8%	0.0%
Widowed	1.6%	6.0%
Divorced	8.3%	13.4%

Education

Less than 9th grade 0.2%

Some HS, no diploma 1.4%

HS graduate 16.1%

Some college, no degree 20.3%

Associate's degree 12.4%

Bachelor's degree 32.6%

Graduate / professional 17.0%

Metric	%
HS diploma or higher	98.4%
Bachelor's or higher	49.6%

School enrollment (ages 3–17)

Type	Count	%
Nursery / preschool	160	8.7%
Kindergarten	96	5.2%
Elementary school	670	36.3%
High school	350	19.0%
College / grad school	569	30.8%

Employment

Industry of employment

Education & healthcare 29.9%

Professional & management 12.7%

Manufacturing 12.5%

Arts, food & hospitality 10.7%

Retail trade 9.7%

Finance & real estate 6.9%

Transportation & utilities 3.5%

Other services 3.5%

Construction 3.2%

Wholesale trade 2.9%

Public administration 2.6%

Agriculture & mining 1.3%

Information 0.5%

Occupation

Category	%
Management, business & arts	53.4%
Service	13.5%
Sales & office	20.4%
Natural resources & construction	4.6%
Production & transportation	8.1%

Employment type

Type	%
Private sector	81.3%
Government	13.2%
Self-employed	5.5%
Unpaid family workers	0.0%

Commute

Method	%
Drive alone	76.6%
Carpool	6.3%
Public transit	1.0%
Walk	3.3%
Other means	0.2%
Avg commute (minutes)	28.7

Poverty

All people 4.0%

Under 18 years 0.0%

18 and over 4.8%

Married-couple families 0.0%

Female-led households 0.0%

Income support

Source	% of households
Social Security	27.1%
Retirement income	20.9%
Supplemental Security	2.9%
Cash public assistance	1.0%
Food stamps / SNAP	4.3%

Health indicators

Condition	%
High blood pressure	25.7%
High cholesterol	27.9%
Heart disease	4.1%
Stroke	1.9%
Asthma	9.9%
Arthritis	19.1%
Kidney disease	2.0%
Pulmonary disease	4.6%
Cancer	5.5%

Behavior / access	%
Binge drinking	20.2%
No physical activity	15.3%
Less than 7 hrs sleep	29.5%
Fair or poor health	9.2%
Poor mental health	14.5%
Poor physical health	8.1%
No health insurance	8.8%
Visited doctor (checkup)	70.7%
Visited dentist	73.7%
Cholesterol screening	89.3%
Teeth loss	9.3%

Veterans & disability

Veterans	Count	%
Civilian veterans	656	8.5%

Disability	%
Any disability	8.2%
Under 18	2.0%
18–64 years	6.0%
65 and over	23.7%

Health insurance coverage

Type	%
Private insurance	82.3%
Public insurance	23.6%
Uninsured under 19	0.0%

Language & origin

Language spoken at home (age 5+)

Language	Count	%
English only	8,956	95.3%
Spanish	86	1.0%
Other Indo-European	38	0.4%
Asian & Pacific Islander	48	0.5%
Other languages	0	0.0%

Place of birth & citizenship

Origin	Count	%
Native born (US)	9,143	97.3%
Born in same state	9,040	96.2%
Born in different state	3,532	37.6%
Foreign born	103	1.1%
Naturalized citizen	257	2.7%
Not a US citizen	119	46.3%

Ancestry

Ancestry	Count	%
French	1,700	18.1%
Italian	1,561	16.6%
German	890	9.5%
Arab	514	5.5%
English	127	1.4%

Ancestry	Count	%
Polish	71	0.8%
Dutch	25	0.3%
Irish	24	0.3%
Norwegian	20	0.2%

Technology access

Metric	% of households
Computer access	44.7%
Internet access	98.8%

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

Frequently asked questions

What is the ZIP code for Newmarket, NH?

Newmarket, NH has one ZIP code: 03857.

What is the main ZIP code for Newmarket, NH?

The primary ZIP code for Newmarket, NH is 03857. The city uses area code 603 for phone service.

What county is Newmarket, NH in?

Newmarket is located in Rockingham County, New Hampshire.

How many ZIP codes are in Newmarket, NH?

Newmarket, NH has 1 ZIP code.

What ZIP code should I use for mail addressed to downtown Newmarket near the Newmarket Mills area?

Downtown Newmarket and the historic Newmarket Mills area are located in ZIP code 03857, which covers the entire city.

What is the ZIP code for the University of New Hampshire campus in Newmarket?

The University of New Hampshire's Durham Campus main location is in Durham, but Newmarket residents use ZIP code 03857, which serves the immediate Newmarket area adjacent to UNH.