06423 ZIP Code — East Haddam, CT

Middlesex County, Connecticut

ZIP code 06423 is located in East Haddam, Connecticut, within Middlesex County. It covers approximately 36.57 square miles and serves a population of 4,887 residents. This is a standard ZIP code in the Eastern (ET) timezone, served by area code 860.

About ZIP code 06423

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 $351,900. Owner-occupancy is high at 93%, well above the national average.

The gap between median ($108,250) and mean household income suggests income inequality — a small number of higher earners pull the average up. The poverty rate of 6% is below the national average. 45% 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. An above-average commute of 36 minutes suggests many residents work outside the immediate area. Remote work is prevalent — 21% of workers work from home.

Educational attainment is high — 45% of residents hold a bachelor's degree or higher, well above the national average of 33%.

Notable community characteristics include a notable veteran presence at 13% of civilians, above the national average of 7%.

Overall, ZIP code 06423 reflects a community defined by a strong veteran community, high homeownership, a high rate of remote workers, and a significant Social Security-dependent population.

4,887

population

36.57

sq mi land

Standard

ZIP type

Eastern (ET)

timezone

06423 ZIP code map

Cities in ZIP code 06423

Below are the cities the US Postal Service accepts for ZIP code 06423. Using any city not on this list may result in mail delivery delays.

City	Status
East Haddam	Preferred

Nearby ZIP codes

06469 Moodus (3.6 mi) 06415 Colchester (5.5 mi) 06438 Haddam (5.9 mi) 06420 Salem (6.4 mi) 06412 Chester (6.8 mi) 06424 East Hampton (7.7 mi) 06417 Deep River (8.1 mi) 06371 Old Lyme (8.5 mi) 06426 Essex (8.8 mi) 06409 Centerbrook (8.8 mi) 06442 Ivoryton (9.3 mi) 06441 Higganum (9.9 mi)

Demographics updated 05/2026

Population
Total population	4,887
Population density	134 / sq mi
State FIPS	09
County FIPS	007

Geography
Land area	36.57 sq mi
Water area	1.71 sq mi
Latitude	41.4759
Longitude	-72.3918
Timezone	Eastern (ET)
Area code	860

Total population by age

Gender

Race & ethnicity

Economics updated 05/2026

Household income

Income range	This ZIP	County avg	State avg
Under $50k	20.0%	28.8%	32.0%
$50k – $100k	32.2%	28.9%	27.7%
$100k – $200k	29.5%	30.3%	27.1%
Over $200k	18.3%	12.1%	13.2%

Demographics & statistics

4,887

Population

134

People per sq mi

50.6

Median age

$108,250

Median household income

$61,505

Per capita income

$351,900

Median home value

$1,597

Median monthly rent

93.4%

Home ownership

6.0%

Poverty rate

3.9%

Unemployment

2,115

Housing units

45.4%

Bachelor's or higher

Age distribution

Male Female

116

Under 5

106

130

5–9

118

208

10–14

190

107

15–19

20–24

222

25–34

202

287

35–44

261

217

45–54

198

274

55–59

249

226

60–64

206

395

65–74

361

252

75–84

229

85+

← Male

Female →

Age summary

Group	Count	%
Under 18	947	19.4%
18 and over	3,940	80.6%
65 and over	1,313	26.9%
Median age	50.6 years

Race & ethnicity

White 89.1%

Two or more races 5.4%

Hispanic or Latino 5%

Black or African American 0.4%

Asian 0.2%

Group	Count	%
White	4,579	89.1%
Two or more races	279	5.4%
Hispanic or Latino	255	5%
Black or African American	20	0.4%
Asian	9	0.2%

Household income

Income range	This ZIP	County avg	State avg
Under $50k	20.0%	28.8%	32.0%
$50k – $100k	32.2%	28.9%	27.7%
$100k – $200k	29.5%	30.3%	27.1%
Over $200k	18.3%	12.1%	13.2%

Under $10k 1.1%

$10k–$15k 0.4%

$15k–$25k 11.0%

$25k–$35k 4.1%

$35k–$50k 3.1%

$50k–$75k 5.8%

$75k–$100k 13.7%

$100k–$150k 32.3%

$150k–$200k 9.5%

$200k+ 18.9%

Range	% of households
Under $10k	1.1%
$10k–$15k	0.4%
$15k–$25k	11.0%
$25k–$35k	4.1%
$35k–$50k	3.1%
$50k–$75k	5.8%
$75k–$100k	13.7%
$100k–$150k	32.3%
$150k–$200k	9.5%
$200k+	18.9%
Median income	$108,250

Housing

Home values

Under $50k 2.7%

$50k–$100k 1.1%

$100k–$150k 1.0%

$150k–$200k 8.8%

$200k–$300k 15.0%

$300k–$500k 55.6%

$500k–$1M 15.9%

Housing overview

Metric	Value
Median home value	$351,900
Median rent / month	$1,597
Owner occupied	93.4%
Renter occupied	6.6%
Vacant	10.7%
Single-family detached	94.4%
Large apartment buildings	0.0%
Mobile homes	0.0%
Median rooms	6.4
Avg household size (owned)	2.42

Year built

Era	%
2020 or later	0.0%
2010–2019	4.5%
2000–2009	11.8%
1990–1999	18.0%
1980–1989	16.0%
1970–1979	8.5%
1960–1969	8.6%
1950–1959	11.2%
1940–1949	0.7%
1939 or earlier	20.7%

Bedrooms

Size	% of units
No bedroom (studio)	0.0%
1 bedroom	4.9%
2 bedrooms	24.0%
3 bedrooms	42.2%
4 bedrooms	23.6%
5+ bedrooms	5.3%

Vehicles per household

Vehicles	% of households
No vehicle	0.0%
1 vehicle	20.4%
2 vehicles	45.7%
3 or more	33.9%

Heating fuel

Fuel type	%
Utility gas	2.6%
Electricity	5.0%
Propane / LP gas	9.1%
Fuel oil	75.7%
Wood	5.6%
No fuel used	1.8%

Households & families

Household type	Count	%
Married-couple family	1,180	58.8%
Cohabiting couple	155	7.7%
Male householder, no spouse	405	20.2%
Female householder, no spouse	268	13.3%
Households with children under 18	487	24.3%
Households with seniors (65+)	949	47.3%
Average household size	2.41

Marital status

Status	Male	Female
Never married	24.6%	23.7%
Married	66.5%	57.8%
Separated	0.0%	4.1%
Widowed	0.6%	7.1%
Divorced	8.3%	7.3%

Education

Less than 9th grade 1.4%

Some HS, no diploma 0.9%

HS graduate 25.8%

Some college, no degree 14.4%

Associate's degree 12.0%

Bachelor's degree 25.8%

Graduate / professional 19.6%

Metric	%
HS diploma or higher	97.7%
Bachelor's or higher	45.4%

School enrollment (ages 3–17)

Type	Count	%
Nursery / preschool	108	9.2%
Kindergarten	42	3.6%
Elementary school	556	47.4%
High school	152	12.9%
College / grad school	316	26.9%

Employment

Industry of employment

Education & healthcare 27.0%

Manufacturing 14.1%

Professional & management 13.1%

Retail trade 8.8%

Construction 8.6%

Arts, food & hospitality 7.4%

Finance & real estate 5.2%

Other services 4.6%

Transportation & utilities 4.2%

Agriculture & mining 2.2%

Information 2.2%

Public administration 1.5%

Wholesale trade 1.0%

Occupation

Category	%
Management, business & arts	53.7%
Service	11.1%
Sales & office	17.2%
Natural resources & construction	8.3%
Production & transportation	9.7%

Employment type

Type	%
Private sector	78.5%
Government	12.0%
Self-employed	7.0%
Unpaid family workers	2.4%

Commute

Method	%
Drive alone	72.0%
Carpool	7.0%
Public transit	0.4%
Walk	0.0%
Work from home	20.5%
Other means	0.0%
Avg commute (minutes)	35.6

Poverty

All people 6.0%

Under 18 years 10.4%

18 and over 5.0%

Married-couple families 1.0%

Female-led households 36.6%

Income support

Source	% of households
Social Security	44.7%
Retirement income	29.7%
Supplemental Security	2.4%
Cash public assistance	2.0%
Food stamps / SNAP	1.7%

Health indicators

Condition	%
Obesity	30.1%
High blood pressure	29.8%
High cholesterol	32.6%
Diabetes	8.1%
Heart disease	5.4%
Stroke	2.3%
Asthma	10.1%
Arthritis	24.3%
Kidney disease	2.4%
Pulmonary disease	5.7%
Cancer	6.9%

Behavior / access	%
Smoking	15.6%
Binge drinking	18.6%
No physical activity	15.7%
Less than 7 hrs sleep	30.6%
Depression	20.9%
Fair or poor health	9.4%
Poor mental health	13.5%
Poor physical health	8.3%
No health insurance	6.9%
Visited doctor (checkup)	77.1%
Visited dentist	75.0%
Cholesterol screening	93.1%
Teeth loss	8.5%

Veterans & disability

Veterans	Count	%
Civilian veterans	493	12.6%

Disability	%
Any disability	10.1%
Under 18	1.2%
18–64 years	4.5%
65 and over	27.6%

Health insurance coverage

Type	%
Private insurance	75.6%
Public insurance	38.8%
No insurance	1.2%
Uninsured under 19	0.0%

Language & origin

Language spoken at home (age 5+)

Language	Count	%
English only	4,665	95.5%
Spanish	17	0.4%
Other Indo-European	17	0.4%
Asian & Pacific Islander	0	0.0%
Other languages	0	0.0%

Place of birth & citizenship

Origin	Count	%
Native born (US)	4,632	94.8%
Born in same state	4,595	94.0%
Born in different state	3,083	63.1%
Foreign born	37	0.8%
Naturalized citizen	255	5.2%
Not a US citizen	194	76.1%

Ancestry

Ancestry	Count	%
Italian	998	20.4%
French	745	15.2%
German	241	4.9%
Arab	181	3.7%

Ancestry	Count	%
English	84	1.7%
Polish	53	1.1%
Irish	20	0.4%
Norwegian	7	0.1%

Technology access

Metric	% of households
Computer access	41.1%
Internet access	92.5%

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

Frequently asked questions about ZIP code 06423

What city is ZIP code 06423 in?

ZIP code 06423 is primarily assigned to East Haddam, Connecticut.

What county is ZIP code 06423 in?

ZIP code 06423 falls within Middlesex County, Connecticut.

Is ZIP code 06423 mostly owner-occupied?

93% of occupied units in ZIP code 06423 are owner-occupied, well above the national average.

Does ZIP code 06423 have an older population?

27% of residents in ZIP code 06423 are 65 or older, above the national average of ~17%.

Does ZIP code 06423 have a large retiree population?

45% of households in ZIP code 06423 receive Social Security income, suggesting a significant retiree or disability population.

Does ZIP code 06423 have a large veteran population?

13% of civilians in ZIP code 06423 are veterans, above the national average of ~7%.

What timezone is ZIP code 06423 in?

ZIP code 06423 observes the EST timezone.