Guilford ZIP Codes — New Haven County, CT

There is one unique ZIP code in Guilford, Connecticut and it is 06437. Area code: 203/475.

ZIP codes

47.12

sq mi land

1.57

sq mi water

203/475

area code

Guilford, CT ZIP code map

About Guilford, CT

Guilford, Connecticut, is a charming coastal town located along the picturesque shoreline of New Haven County. Known for its rich history and vibrant community, Guilford offers a blend of scenic beauty and small-town charm. The town is well-regarded for its historic homes, cultural sites, and welcoming atmosphere.

Location & geography

Guilford is situated on the southern edge of New Haven County, bordered by Long Island Sound to the south. It is conveniently located near several cities, with Madison to the east just 5 miles away and Branford to the west about 8 miles from the town center. The town covers a land area of 47.12 square miles, including 1.57 square miles of water, adding to its natural allure.

Community & economy

Guilford boasts a close-knit community characterized by its friendly residents and a commitment to preserving its heritage. The town has a diverse economic base, including retail, healthcare, and hospitality industries, which contribute to the local economy while maintaining a cozy, quaint environment. Daily life in Guilford revolves around community events, local shops, and active participation in outdoor activities given its scenic landscapes.

Transportation

Guilford is accessible via Interstate 95, which provides easy connections to nearby cities and highways. The nearest airport is Tweed New Haven Airport, located approximately 10 miles from the town center, serving both domestic and limited international flights. Public transportation options, such as the Shore Line East train service, further enhance access to and from Guilford.

History

Guilford was founded in 1639 by English settlers and was officially recognized as a town in 1643, playing a vital role in early American history. The town's economy historically relied on shipbuilding, agriculture, and fishing, which paved the way for its development. Notable events in Guilford's history include hosting the first toll road in Connecticut and the impact of the American Revolutionary War.

Did you know?

One surprising fact about Guilford is that it is home to the historic Guilford Green, which serves as a centerpiece for many town events and celebrations. Additionally, the town is known for its significant number of pre-colonial homes, highlighting its long-standing commitment to preserving history.

ZIP codes for Guilford, CT (1)

ZIP code	City	County	Map
06437	Guilford	New Haven	View map

Demographics & statistics

22,046

Population

50.2

Median age

$124,793

Median household income

$70,609

Per capita income

$462,200

Median home value

$1,725

Median monthly rent

85.2%

Home ownership

2.8%

Poverty rate

4.5%

Unemployment

8,481

Housing units

59.5%

Bachelor's or higher

Age distribution

Male Female

428

Under 5

399

637

5–9

595

916

10–14

855

761

15–19

709

435

20–24

406

581

25–34

542

1,261

35–44

1,176

1,611

45–54

1,502

865

55–59

806

1,015

60–64

947

1,637

65–74

1,527

912

75–84

851

348

85+

324

← Male

Female →

Age summary

Group	Count	%
Under 18	4,909	22.3%
18 and over	17,137	77.7%
65 and over	5,599	25.4%
Median age	50.2 years

Race & ethnicity

White 84.6%

Two or more races 4.9%

Hispanic or Latino 4.2%

Asian 3.1%

Black or African American 1.9%

Other race 1.4%

Group	Count	%
White	19,455	84.6%
Two or more races	1,127	4.9%
Hispanic or Latino	961	4.2%
Asian	712	3.1%
Black or African American	436	1.9%
Other race	316	1.4%

Household income

Under $10k 1.5%

$10k–$15k 1.4%

$15k–$25k 4.7%

$25k–$35k 4.4%

$35k–$50k 7.8%

$50k–$75k 12.4%

$75k–$100k 7.4%

$100k–$150k 19.1%

$150k–$200k 13.0%

$200k+ 28.3%

Range	% of households
Under $10k	1.5%
$10k–$15k	1.4%
$15k–$25k	4.7%
$25k–$35k	4.4%
$35k–$50k	7.8%
$50k–$75k	12.4%
$75k–$100k	7.4%
$100k–$150k	19.1%
$150k–$200k	13.0%
$200k+	28.3%
Median income	$124,793

Housing

Home values

Under $50k 1.1%

$50k–$100k 0.5%

$100k–$150k 1.2%

$150k–$200k 1.1%

$200k–$300k 8.3%

$300k–$500k 47.7%

$500k–$1M 32.8%

$1M+ 7.3%

Housing overview

Metric	Value
Median home value	$462,200
Median rent / month	$1,725
Owner occupied	85.2%
Renter occupied	14.8%
Vacant	10.2%
Single-family detached	85.0%
Large apartment buildings	2.9%
Mobile homes	0.3%
Median rooms	6.6
Avg household size (owned)	2.55

Year built

Era	%
2020 or later	0.1%
2010–2019	3.3%
2000–2009	4.3%
1990–1999	10.4%
1980–1989	19.7%
1970–1979	18.6%
1960–1969	14.4%
1950–1959	10.9%
1940–1949	5.4%
1939 or earlier	12.9%

Bedrooms

Size	% of units
No bedroom (studio)	1.6%
1 bedroom	7.8%
2 bedrooms	24.2%
3 bedrooms	30.6%
4 bedrooms	29.3%
5+ bedrooms	6.6%

Vehicles per household

Vehicles	% of households
No vehicle	2.4%
1 vehicle	22.5%
2 vehicles	46.0%
3 or more	29.1%

Heating fuel

Fuel type	%
Utility gas	17.6%
Electricity	12.2%
Propane / LP gas	8.4%
Fuel oil	59.2%
Wood	1.7%

Households & families

Household type	Count	%
Married-couple family	5,682	64.7%
Cohabiting couple	227	2.6%
Male householder, no spouse	1,208	13.7%
Female householder, no spouse	1,669	19.0%
Households with children under 18	2,399	27.3%
Households with seniors (65+)	3,831	43.6%
Average household size	2.48

Marital status

Status	Male	Female
Never married	24.7%	16.8%
Married	63.9%	64.2%
Separated	0.1%	1.2%
Widowed	3.7%	8.1%
Divorced	7.6%	9.6%

Education

Less than 9th grade 0.5%

Some HS, no diploma 2.4%

HS graduate 15.8%

Some college, no degree 14.1%

Associate's degree 7.9%

Bachelor's degree 27.7%

Graduate / professional 31.8%

Metric	%
HS diploma or higher	97.2%
Bachelor's or higher	59.5%

School enrollment (ages 3–17)

Type	Count	%
Nursery / preschool	365	6.9%
Kindergarten	262	5.0%
Elementary school	2,524	47.9%
High school	1,324	25.1%
College / grad school	795	15.1%

Employment

Industry of employment

Education & healthcare 30.6%

Manufacturing 11.4%

Professional & management 10.2%

Retail trade 9.6%

Construction 8.0%

Finance & real estate 7.2%

Public administration 5.4%

Arts, food & hospitality 4.9%

Information 3.4%

Other services 3.4%

Transportation & utilities 3.1%

Wholesale trade 2.7%

Agriculture & mining 0.1%

Occupation

Category	%
Management, business & arts	57.8%
Service	10.7%
Sales & office	17.8%
Natural resources & construction	8.5%
Production & transportation	5.1%

Employment type

Type	%
Private sector	77.3%
Government	14.7%
Self-employed	8.0%
Unpaid family workers	0.0%

Commute

Method	%
Drive alone	75.2%
Carpool	3.9%
Public transit	1.0%
Walk	1.1%
Other means	1.0%
Avg commute (minutes)	26.4

Poverty

All people 2.8%

Under 18 years 1.7%

18 and over 3.2%

Married-couple families 0.6%

Female-led households 2.9%

Income support

Source	% of households
Social Security	39.9%
Retirement income	30.2%
Supplemental Security	3.4%
Cash public assistance	1.6%
Food stamps / SNAP	2.6%

Health indicators

Condition	%
High blood pressure	31.4%
High cholesterol	35.6%
Heart disease	5.8%
Stroke	2.4%
Asthma	9.9%
Arthritis	25.4%
Kidney disease	2.5%
Pulmonary disease	5.2%
Cancer	8.3%

Behavior / access	%
Binge drinking	14.9%
No physical activity	16.0%
Less than 7 hrs sleep	31.4%
Fair or poor health	8.5%
Poor mental health	11.7%
Poor physical health	7.7%
No health insurance	5.3%
Visited doctor (checkup)	78.1%
Visited dentist	79.8%
Cholesterol screening	94.8%
Teeth loss	6.2%

Veterans & disability

Veterans	Count	%
Civilian veterans	1,249	7.3%

Disability	%
Any disability	8.1%
Under 18	2.7%
18–64 years	4.8%
65 and over	19.8%

Health insurance coverage

Type	%
Private insurance	79.0%
Public insurance	32.4%
Uninsured under 19	0.0%

Language & origin

Language spoken at home (age 5+)

Language	Count	%
English only	21,219	96.2%
Spanish	456	2.1%
Other Indo-European	177	0.8%
Asian & Pacific Islander	62	0.3%
Other languages	217	1.0%

Place of birth & citizenship

Origin	Count	%
Native born (US)	20,201	91.6%
Born in same state	19,766	89.7%
Born in different state	12,266	55.6%
Foreign born	435	2.0%
Naturalized citizen	1,845	8.4%
Not a US citizen	995	53.9%

Ancestry

Ancestry	Count	%
Italian	4,823	21.9%
French	3,480	15.8%
Arab	890	4%
German	674	3.1%
English	168	0.8%

Ancestry	Count	%
Norwegian	157	0.7%
Irish	154	0.7%
Polish	125	0.6%
Dutch	73	0.3%

Technology access

Metric	% of households
Computer access	39.9%
Internet access	96.9%

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

Frequently asked questions

What ZIP codes does Guilford, CT have?

Guilford, CT has one ZIP code: 06437. Each ZIP code serves a distinct delivery area within the city and surrounding region.