11766 ZIP Code — Mount Sinai, NY

Suffolk County, New York

ZIP code 11766 is located in Mount Sinai, New York, within Suffolk County. It covers approximately 6.03 square miles and serves a population of 11,476 residents. This is a standard ZIP code in the Eastern (ET) timezone, served by area code 631/516.

About ZIP code 11766

The housing stock consists of predominantly single-family detached homes. Most homes were built in the 1970s, giving the area an established character. Median home value is $590,000. Owner-occupancy is high at 98%, well above the national average.

The gap between median ($146,042) and mean household income suggests income inequality — a small number of higher earners pull the average up. 46% 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 34 minutes is near the national average.

Educational attainment is high — 49% of residents hold a bachelor's degree or higher, well above the national average of 33%.

Overall, ZIP code 11766 reflects a community defined by high homeownership and a significant Social Security-dependent population.

11,476

population

6.03

sq mi land

Standard

ZIP type

Eastern (ET)

timezone

11766 ZIP code map

Cities in ZIP code 11766

Below are the cities the US Postal Service accepts for ZIP code 11766. Using any city not on this list may result in mail delivery delays.

City	Status
Mount Sinai	Acceptable
Mount Sinai	Preferred

Nearby ZIP codes

11764 Miller Place (1.6 mi) 11776 Port Jefferson Station (2.2 mi) 11789 Sound Beach (2.5 mi) 11777 Port Jefferson (3.1 mi) 11727 Coram (3.9 mi) 11778 Rocky Point (4 mi) 11784 Selden (4.7 mi) 11953 Middle Island (4.9 mi) 11733 East Setauket (5.3 mi) 11720 Centereach (5.8 mi) 11794 Stony Brook (6.1 mi) 11790 Stony Brook (6.3 mi)

Demographics updated 05/2026

Population
Total population	11,476
Population density	1,903 / sq mi
State FIPS	36
County FIPS	103

Geography
Land area	6.03 sq mi
Water area	1.44 sq mi
Latitude	40.9337
Longitude	-73.0103
Timezone	Eastern (ET)
Area code	631/516

Total population by age

Gender

Race & ethnicity

Economics updated 05/2026

Household income

Income range	This ZIP	County avg	State avg
Under $50k	14.6%	22.6%	37.0%
$50k – $100k	24.0%	24.7%	27.0%
$100k – $200k	37.1%	34.6%	24.4%
Over $200k	24.3%	18.0%	11.5%

Demographics & statistics

11,476

Population

1,903

People per sq mi

46.5

Median age

$146,042

Median household income

$59,558

Per capita income

$590,000

Median home value

$3,308

Median monthly rent

97.7%

Home ownership

1.8%

Poverty rate

6.0%

Unemployment

3,908

Housing units

49.2%

Bachelor's or higher

Age distribution

Male Female

244

Under 5

234

375

5–9

358

432

10–14

413

424

15–19

406

276

20–24

263

299

25–34

285

753

35–44

720

883

45–54

845

339

55–59

325

314

60–64

301

869

65–74

831

534

75–84

511

124

85+

118

← Male

Female →

Age summary

Group	Count	%
Under 18	2,699	23.5%
18 and over	8,777	76.5%
65 and over	2,987	26.0%
Median age	46.5 years

Race & ethnicity

White 84.3%

Two or more races 4.3%

Hispanic or Latino 4.2%

Asian 3.8%

Black or African American 1.9%

Other race 1.5%

American Indian / Alaska Native 0.1%

Group	Count	%
White	10,094	84.3%
Two or more races	513	4.3%
Hispanic or Latino	502	4.2%
Asian	453	3.8%
Black or African American	233	1.9%
Other race	176	1.5%
American Indian / Alaska Native	7	0.1%

Household income

Income range	This ZIP	County avg	State avg
Under $50k	14.6%	22.6%	37.0%
$50k – $100k	24.0%	24.7%	27.0%
$100k – $200k	37.1%	34.6%	24.4%
Over $200k	24.3%	18.0%	11.5%

Under $10k 0.9%

$10k–$15k 1.5%

$15k–$25k 0.6%

$25k–$35k 4.9%

$35k–$50k 4.0%

$50k–$75k 10.8%

$75k–$100k 9.7%

$100k–$150k 18.0%

$150k–$200k 17.3%

$200k+ 32.2%

Range	% of households
Under $10k	0.9%
$10k–$15k	1.5%
$15k–$25k	0.6%
$25k–$35k	4.9%
$35k–$50k	4.0%
$50k–$75k	10.8%
$75k–$100k	9.7%
$100k–$150k	18.0%
$150k–$200k	17.3%
$200k+	32.2%
Median income	$146,042

Housing

Home values

Under $50k 0.8%

$50k–$100k 1.8%

$100k–$150k 0.6%

$150k–$200k 1.2%

$200k–$300k 2.5%

$300k–$500k 28.3%

$500k–$1M 58.8%

$1M+ 6.0%

Housing overview

Metric	Value
Median home value	$590,000
Median rent / month	$3,308
Owner occupied	97.7%
Renter occupied	2.3%
Vacant	4.0%
Single-family detached	81.5%
Large apartment buildings	0.3%
Mobile homes	0.0%
Median rooms	7.6
Avg household size (owned)	2.98

Year built

Era	%
2020 or later	1.4%
2010–2019	2.7%
2000–2009	27.3%
1990–1999	6.5%
1980–1989	12.1%
1970–1979	34.5%
1960–1969	5.7%
1950–1959	2.4%
1940–1949	0.5%
1939 or earlier	7.0%

Bedrooms

Size	% of units
No bedroom (studio)	0.5%
1 bedroom	2.7%
2 bedrooms	19.8%
3 bedrooms	27.1%
4 bedrooms	38.7%
5+ bedrooms	11.1%

Vehicles per household

Vehicles	% of households
No vehicle	3.9%
1 vehicle	28.1%
2 vehicles	39.1%
3 or more	28.9%

Heating fuel

Fuel type	%
Utility gas	37.1%
Electricity	8.0%
Propane / LP gas	1.8%
Fuel oil	52.0%
Wood	0.9%
Solar	0.1%

Households & families

Household type	Count	%
Married-couple family	3,016	78.6%
Cohabiting couple	59	1.5%
Male householder, no spouse	255	6.6%
Female householder, no spouse	509	13.3%
Households with children under 18	1,281	33.4%
Households with seniors (65+)	1,838	47.9%
Average household size	2.97

Marital status

Status	Male	Female
Never married	24.1%	22.7%
Married	68.1%	65.8%
Separated	0.4%	1.6%
Widowed	3.0%	4.3%
Divorced	4.5%	5.5%

Education

Less than 9th grade 2.0%

Some HS, no diploma 4.5%

HS graduate 21.2%

Some college, no degree 13.5%

Associate's degree 9.5%

Bachelor's degree 24.6%

Graduate / professional 24.6%

Metric	%
HS diploma or higher	93.4%
Bachelor's or higher	49.2%

School enrollment (ages 3–17)

Type	Count	%
Nursery / preschool	142	4.9%
Kindergarten	182	6.2%
Elementary school	1,311	44.8%
High school	748	25.6%
College / grad school	544	18.6%

Employment

Industry of employment

Education & healthcare 31.0%

Professional & management 14.1%

Finance & real estate 11.6%

Retail trade 7.4%

Construction 6.2%

Arts, food & hospitality 6.2%

Manufacturing 5.1%

Public administration 5.0%

Wholesale trade 3.7%

Transportation & utilities 3.7%

Other services 3.5%

Information 2.3%

Occupation

Category	%
Management, business & arts	57.4%
Service	9.6%
Sales & office	19.1%
Natural resources & construction	9.7%
Production & transportation	4.3%

Employment type

Type	%
Private sector	70.6%
Government	23.8%
Self-employed	5.0%
Unpaid family workers	0.5%

Commute

Method	%
Drive alone	75.5%
Carpool	7.0%
Public transit	2.8%
Walk	0.7%
Work from home	13.0%
Other means	0.9%
Avg commute (minutes)	33.5

Poverty

All people 1.8%

Under 18 years 0.0%

18 and over 2.3%

Married-couple families 1.2%

Female-led households 0.0%

Income support

Source	% of households
Social Security	46.2%
Retirement income	39.4%
Supplemental Security	2.8%
Cash public assistance	1.7%
Food stamps / SNAP	2.6%

Health indicators

Condition	%
Obesity	25.4%
High blood pressure	27.5%
High cholesterol	31.2%
Diabetes	7.5%
Heart disease	5.0%
Stroke	2.2%
Asthma	9.2%
Arthritis	19.7%
Kidney disease	2.4%
Pulmonary disease	4.9%
Cancer	7.0%

Behavior / access	%
Smoking	12.3%
Binge drinking	18.0%
No physical activity	18.5%
Less than 7 hrs sleep	32.2%
Depression	16.7%
Fair or poor health	8.8%
Poor mental health	12.3%
Poor physical health	7.6%
No health insurance	8.0%
Visited doctor (checkup)	78.9%
Visited dentist	74.0%
Cholesterol screening	93.4%
Teeth loss	8.1%

Veterans & disability

Veterans	Count	%
Civilian veterans	502	5.7%

Disability	%
Any disability	8.6%
Under 18	2.5%
18–64 years	4.7%
65 and over	21.6%

Health insurance coverage

Type	%
Private insurance	88.0%
Public insurance	31.6%
No insurance	0.8%
Uninsured under 19	0.8%

Language & origin

Language spoken at home (age 5+)

Language	Count	%
English only	10,998	95.8%
Spanish	221	2.0%
Other Indo-European	55	0.5%
Asian & Pacific Islander	121	1.1%
Other languages	45	0.4%

Place of birth & citizenship

Origin	Count	%
Native born (US)	10,609	92.4%
Born in same state	10,573	92.1%
Born in different state	9,750	85.0%
Foreign born	36	0.3%
Naturalized citizen	867	7.6%
Not a US citizen	742	85.6%

Ancestry

Ancestry	Count	%
Italian	2,778	24.2%
Arab	881	7.7%
French	758	6.6%
German	176	1.5%
English	113	1%

Ancestry	Count	%
Polish	65	0.6%
Norwegian	36	0.3%
Dutch	12	0.1%
Irish	4	0%

Technology access

Metric	% of households
Computer access	33.5%
Internet access	94.6%

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

Frequently asked questions about ZIP code 11766

What city is ZIP code 11766 in?

ZIP code 11766 is primarily assigned to Mount Sinai, New York.

What county is ZIP code 11766 in?

ZIP code 11766 falls within Suffolk County, New York.

Is ZIP code 11766 mostly owner-occupied?

98% of occupied units in ZIP code 11766 are owner-occupied, well above the national average.

Does ZIP code 11766 have an older population?

26% of residents in ZIP code 11766 are 65 or older, above the national average of ~17%.

Does ZIP code 11766 have a large retiree population?

46% of households in ZIP code 11766 receive Social Security income, suggesting a significant retiree or disability population.

How educated is the population of ZIP code 11766?

49% of residents hold a bachelor's degree or higher — well above the national average of ~33%, reflecting a highly educated population.

What timezone is ZIP code 11766 in?

ZIP code 11766 observes the EST timezone.