06437 ZIP Code — Guilford, CT

New Haven County, Connecticut

ZIP code 06437 is located in Guilford, Connecticut, within New Haven County. It covers approximately 47.12 square miles and serves a population of 22,046 residents. This is a standard ZIP code in the Eastern (ET) timezone, served by area code 203/475.

About ZIP code 06437

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 $462,200. Owner-occupancy is high at 85%, well above the national average.

The gap between median ($124,793) and mean household income suggests income inequality — a small number of higher earners pull the average up. The poverty rate of 3% is below the national average. 40% 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 26 minutes is near the national average.

Educational attainment is high — 60% of residents hold a bachelor's degree or higher, well above the national average of 33%.

Overall, ZIP code 06437 reflects a community defined by a highly educated population, high homeownership, and a significant Social Security-dependent population.

22,046

population

47.12

sq mi land

Standard

ZIP type

Eastern (ET)

timezone

06437 ZIP code map

Cities in ZIP code 06437

Below are the cities the US Postal Service accepts for ZIP code 06437. Using any city not on this list may result in mail delivery delays.

City	Status
Guilford	Preferred

Nearby ZIP codes

06443 Madison (4.6 mi) 06471 North Branford (4.7 mi) 06472 Northford (4.9 mi) 06419 Killingworth (6.2 mi) 06405 Branford (6.7 mi) 06413 Clinton (8.4 mi) 06422 Durham (8.5 mi) 06513 New Haven (9.2 mi) 06473 North Haven (9.3 mi) 06512 East Haven (9.9 mi) 06495 Wallingford (10.2 mi) 06441 Higganum (10.2 mi)

Demographics updated 05/2026

Population
Total population	22,046
Population density	468 / sq mi
State FIPS	09
County FIPS	009

Geography
Land area	47.12 sq mi
Water area	1.57 sq mi
Latitude	41.3386
Longitude	-72.6895
Timezone	Eastern (ET)
Area code	203/475

Total population by age

Gender

Race & ethnicity

Economics updated 05/2026

Household income

Income range	This ZIP	County avg	State avg
Under $50k	23.5%	35.9%	32.0%
$50k – $100k	21.6%	28.9%	27.7%
$100k – $200k	30.4%	25.5%	27.1%
Over $200k	24.5%	9.7%	13.2%

Demographics & statistics

22,046

Population

468

People per sq mi

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

Income range	This ZIP	County avg	State avg
Under $50k	23.5%	35.9%	32.0%
$50k – $100k	21.6%	28.9%	27.7%
$100k – $200k	30.4%	25.5%	27.1%
Over $200k	24.5%	9.7%	13.2%

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%
Work from home	17.8%
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	%
Obesity	29.3%
High blood pressure	31.4%
High cholesterol	35.6%
Diabetes	8.7%
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	%
Smoking	11.4%
Binge drinking	14.9%
No physical activity	16.0%
Less than 7 hrs sleep	31.4%
Depression	18.7%
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%
No insurance	1.9%
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 about ZIP code 06437

What city is ZIP code 06437 in?

ZIP code 06437 is primarily assigned to Guilford, Connecticut.

What county is ZIP code 06437 in?

ZIP code 06437 falls within New Haven County, Connecticut.

How educated is the population of ZIP code 06437?

60% of residents hold a bachelor's degree or higher — well above the national average of ~33%, reflecting a highly educated population.

Does ZIP code 06437 have an older population?

25% of residents in ZIP code 06437 are 65 or older, above the national average of ~17%.

Is ZIP code 06437 mostly owner-occupied?

85% of occupied units in ZIP code 06437 are owner-occupied, well above the national average.

Does ZIP code 06437 have a large retiree population?

40% of households in ZIP code 06437 receive Social Security income, suggesting a significant retiree or disability population.

What timezone is ZIP code 06437 in?

ZIP code 06437 observes the EST timezone.