06378 ZIP Code — Stonington, CT

New London County, Connecticut

ZIP code 06378 is located in Stonington, Connecticut, within New London County. It covers approximately 20.90 square miles and serves a population of 5,488 residents. This is a standard ZIP code in the Eastern (ET) timezone, served by area code 860.

About ZIP code 06378

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 $522,200. Owner-occupancy sits near the national average at 74%.

The gap between median ($113,482) 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. 41% 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 27 minutes is near the national average. Remote work is prevalent — 22% of workers work from home.

Educational attainment is high — 56% of residents hold a bachelor's degree or higher, well above the national average of 33%.

Overall, ZIP code 06378 reflects a community defined by a highly educated population, a high rate of remote workers, and a significant Social Security-dependent population.

5,488

population

20.90

sq mi land

Standard

ZIP type

Eastern (ET)

timezone

06378 ZIP code map

Cities in ZIP code 06378

Below are the cities the US Postal Service accepts for ZIP code 06378. Using any city not on this list may result in mail delivery delays.

City	Status
Stonington	Acceptable
Stonington	Preferred

Nearby ZIP codes

06355 Mystic (3.1 mi) 02891 Westerly (6 mi) 06339 Ledyard (6.1 mi) 06359 North Stonington (6.4 mi) 06340 Groton (6.5 mi) 06335 Gales Ferry (8.5 mi) 02804 Ashaway (8.8 mi) 02808 Bradford (9.2 mi) 02833 Hopkinton (10 mi) 06320 New London (10.1 mi) 06365 Preston (10.2 mi) 06375 Quaker Hill (11.2 mi)

Demographics updated 05/2026

Population
Total population	5,488
Population density	263 / sq mi
State FIPS	09
County FIPS	011

Geography
Land area	20.90 sq mi
Water area	1.76 sq mi
Latitude	41.3803
Longitude	-71.9160
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	19.9%	32.0%	32.0%
$50k – $100k	29.2%	30.8%	27.7%
$100k – $200k	32.0%	28.0%	27.1%
Over $200k	18.9%	9.2%	13.2%

Demographics & statistics

5,488

Population

263

People per sq mi

57.0

Median age

$113,482

Median household income

$79,594

Per capita income

$522,200

Median home value

$1,546

Median monthly rent

74.4%

Home ownership

2.8%

Poverty rate

4.7%

Unemployment

2,569

Housing units

55.7%

Bachelor's or higher

Age distribution

Male Female

Under 5

103

5–9

107

10–14

15–19

101

109

20–24

113

234

25–34

243

164

35–44

170

386

45–54

400

246

55–59

254

302

60–64

312

599

65–74

620

244

75–84

253

85+

← Male

Female →

Age summary

Group	Count	%
Under 18	681	12.4%
18 and over	4,807	87.6%
65 and over	1,836	33.5%
Median age	57.0 years

Race & ethnicity

White 94.6%

Two or more races 1.9%

Black or African American 1.2%

Hispanic or Latino 1%

Other race 0.6%

Asian 0.6%

Group	Count	%
White	5,246	94.6%
Two or more races	108	1.9%
Black or African American	66	1.2%
Hispanic or Latino	55	1%
Other race	34	0.6%
Asian	32	0.6%

Household income

Income range	This ZIP	County avg	State avg
Under $50k	19.9%	32.0%	32.0%
$50k – $100k	29.2%	30.8%	27.7%
$100k – $200k	32.0%	28.0%	27.1%
Over $200k	18.9%	9.2%	13.2%

Under $10k 3.3%

$10k–$15k 1.3%

$15k–$25k 3.3%

$25k–$35k 4.1%

$35k–$50k 6.1%

$50k–$75k 15.2%

$75k–$100k 9.0%

$100k–$150k 17.3%

$150k–$200k 17.8%

$200k+ 22.7%

Range	% of households
Under $10k	3.3%
$10k–$15k	1.3%
$15k–$25k	3.3%
$25k–$35k	4.1%
$35k–$50k	6.1%
$50k–$75k	15.2%
$75k–$100k	9.0%
$100k–$150k	17.3%
$150k–$200k	17.8%
$200k+	22.7%
Median income	$113,482

Housing

Home values

Under $50k 5.4%

$50k–$100k 1.2%

$100k–$150k 1.8%

$150k–$200k 1.5%

$200k–$300k 10.0%

$300k–$500k 28.1%

$500k–$1M 37.5%

$1M+ 14.6%

Housing overview

Metric	Value
Median home value	$522,200
Median rent / month	$1,546
Owner occupied	74.4%
Renter occupied	25.6%
Vacant	18.2%
Single-family detached	75.9%
Large apartment buildings	1.8%
Mobile homes	3.7%
Median rooms	5.9
Avg household size (owned)	2.17

Year built

Era	%
2020 or later	0.0%
2010–2019	3.7%
2000–2009	9.8%
1990–1999	8.7%
1980–1989	16.7%
1970–1979	5.5%
1960–1969	6.6%
1950–1959	9.4%
1940–1949	5.0%
1939 or earlier	34.6%

Bedrooms

Size	% of units
No bedroom (studio)	0.1%
1 bedroom	13.1%
2 bedrooms	21.4%
3 bedrooms	38.7%
4 bedrooms	21.1%
5+ bedrooms	5.6%

Vehicles per household

Vehicles	% of households
No vehicle	1.4%
1 vehicle	34.3%
2 vehicles	41.6%
3 or more	22.7%

Heating fuel

Fuel type	%
Utility gas	2.3%
Electricity	12.9%
Propane / LP gas	20.0%
Fuel oil	62.2%
Wood	1.7%

Households & families

Household type	Count	%
Married-couple family	1,444	54.3%
Cohabiting couple	151	5.7%
Male householder, no spouse	409	15.4%
Female householder, no spouse	656	24.7%
Households with children under 18	380	14.3%
Households with seniors (65+)	1,250	47.0%
Average household size	2.06

Marital status

Status	Male	Female
Never married	25.4%	19.4%
Married	60.9%	58.2%
Separated	0.4%	0.9%
Widowed	2.3%	6.7%
Divorced	11.0%	14.8%

Education

Less than 9th grade 0.7%

Some HS, no diploma 0.3%

HS graduate 12.9%

Some college, no degree 19.6%

Associate's degree 10.8%

Bachelor's degree 29.7%

Graduate / professional 26.0%

Metric	%
HS diploma or higher	99.0%
Bachelor's or higher	55.7%

School enrollment (ages 3–17)

Type	Count	%
Nursery / preschool	93	12.8%
Kindergarten	50	6.9%
Elementary school	244	33.7%
High school	180	24.8%
College / grad school	158	21.8%

Employment

Industry of employment

Education & healthcare 25.2%

Professional & management 12.7%

Arts, food & hospitality 12.7%

Manufacturing 12.3%

Retail trade 10.0%

Finance & real estate 9.9%

Construction 3.5%

Public administration 3.4%

Agriculture & mining 3.0%

Other services 3.0%

Wholesale trade 1.6%

Transportation & utilities 1.5%

Information 1.0%

Occupation

Category	%
Management, business & arts	56.2%
Service	12.6%
Sales & office	20.7%
Natural resources & construction	4.0%
Production & transportation	6.5%

Employment type

Type	%
Private sector	71.5%
Government	11.7%
Self-employed	16.6%
Unpaid family workers	0.2%

Commute

Method	%
Drive alone	69.2%
Carpool	4.5%
Public transit	1.6%
Walk	1.7%
Work from home	22.0%
Other means	1.0%
Avg commute (minutes)	27.0

Poverty

All people 2.8%

Under 18 years 3.8%

18 and over 2.7%

Married-couple families 0.2%

Female-led households 16.0%

Income support

Source	% of households
Social Security	40.6%
Retirement income	31.2%
Supplemental Security	2.9%
Cash public assistance	1.4%
Food stamps / SNAP	1.4%

Health indicators

Condition	%
Obesity	28.8%
High blood pressure	33.4%
High cholesterol	36.4%
Diabetes	8.6%
Heart disease	6.8%
Stroke	2.7%
Asthma	10.0%
Arthritis	26.7%
Kidney disease	2.8%
Pulmonary disease	6.1%
Cancer	8.9%

Behavior / access	%
Smoking	12.5%
Binge drinking	15.3%
No physical activity	15.0%
Less than 7 hrs sleep	30.7%
Depression	20.2%
Fair or poor health	9.3%
Poor mental health	11.8%
Poor physical health	8.2%
No health insurance	6.0%
Visited doctor (checkup)	79.7%
Visited dentist	78.8%
Cholesterol screening	94.7%
Teeth loss	7.1%

Veterans & disability

Veterans	Count	%
Civilian veterans	297	6.3%

Disability	%
Any disability	10.3%
Under 18	1.6%
18–64 years	6.1%
65 and over	20.0%

Health insurance coverage

Type	%
Private insurance	81.7%
Public insurance	40.1%
No insurance	2.7%
Uninsured under 19	0.0%

Language & origin

Language spoken at home (age 5+)

Language	Count	%
English only	5,331	97.1%
Spanish	24	0.5%
Other Indo-European	9	0.2%
Asian & Pacific Islander	15	0.3%
Other languages	0	0.0%

Place of birth & citizenship

Origin	Count	%
Native born (US)	5,296	96.5%
Born in same state	5,260	95.8%
Born in different state	2,003	36.5%
Foreign born	36	0.7%
Naturalized citizen	192	3.5%
Not a US citizen	147	76.6%

Ancestry

Ancestry	Count	%
Italian	1,448	26.4%
French	1,175	21.4%
German	216	3.9%
Arab	132	2.4%
Polish	100	1.8%

Ancestry	Count	%
English	48	0.9%
Irish	26	0.5%
Norwegian	19	0.3%
Dutch	6	0.1%

Technology access

Metric	% of households
Computer access	48.5%
Internet access	96.1%

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

Frequently asked questions about ZIP code 06378

What city is ZIP code 06378 in?

ZIP code 06378 is primarily assigned to Stonington, Connecticut.

What county is ZIP code 06378 in?

ZIP code 06378 falls within New London County, Connecticut.

Does ZIP code 06378 have an older population?

34% of residents in ZIP code 06378 are 65 or older, above the national average of ~17%.

How educated is the population of ZIP code 06378?

56% of residents hold a bachelor's degree or higher — well above the national average of ~33%, reflecting a highly educated population.

Does ZIP code 06378 have a large retiree population?

41% of households in ZIP code 06378 receive Social Security income, suggesting a significant retiree or disability population.

What is the typical home value in ZIP code 06378?

The median home value in ZIP code 06378 is $522,200.

What timezone is ZIP code 06378 in?

ZIP code 06378 observes the EST timezone.