11791 ZIP Code — Syosset, NY

Nassau County, New York

ZIP code 11791 is located in Syosset, New York, within Nassau County. It covers approximately 12.51 square miles and serves a population of 25,631 residents. This is a standard ZIP code in the Eastern (ET) timezone, served by area code 516.

About ZIP code 11791

The housing stock consists of predominantly single-family detached homes. Most homes were built in the 1950s, giving the area an established character. Median home value is $877,400. Owner-occupancy is high at 93%, well above the national average.

The gap between median ($190,347) and mean household income suggests income inequality — a small number of higher earners pull the average up. The poverty rate of 5% is below the national average.

The dominant occupation class is management, business, and professional, with education and healthcare as the leading industry. An above-average commute of 39 minutes suggests many residents work outside the immediate area. Remote work is prevalent — 20% of workers work from home.

Educational attainment is high — 69% of residents hold a bachelor's degree or higher, well above the national average of 33%.

Overall, ZIP code 11791 reflects a community defined by a highly educated population, high homeownership, and a high rate of remote workers.

25,631

population

12.51

sq mi land

Standard

ZIP type

Eastern (ET)

timezone

11791 ZIP code map

Cities in ZIP code 11791

Below are the cities the US Postal Service accepts for ZIP code 11791. Using any city not on this list may result in mail delivery delays.

City	Status
Syosset	Acceptable
Syosset	Preferred

Nearby ZIP codes

11797 Woodbury (1.9 mi) 11732 East Norwich (2.3 mi) 11853 Jericho (3.2 mi) 11753 Jericho (3.2 mi) 11771 Oyster Bay (3.5 mi) 11724 Cold Spring Harbor (3.5 mi) 11815 Hicksville (4.3 mi) 11801 Hicksville (4.5 mi) 11545 Glen Head (4.5 mi) 11765 Mill Neck (4.7 mi) 11568 Old Westbury (5.4 mi) 11560 Locust Valley (5.6 mi)

Demographics updated 05/2026

Population
Total population	25,631
Population density	2,049 / sq mi
State FIPS	36
County FIPS	059

Geography
Land area	12.51 sq mi
Water area	0.28 sq mi
Latitude	40.8288
Longitude	-73.5042
Timezone	Eastern (ET)
Area code	516

Total population by age

Gender

Race & ethnicity

Economics updated 05/2026

Household income

Income range	This ZIP	County avg	State avg
Under $50k	14.1%	20.1%	37.0%
$50k – $100k	15.7%	21.8%	27.0%
$100k – $200k	27.3%	33.1%	24.4%
Over $200k	42.9%	25.0%	11.5%

Demographics & statistics

25,631

Population

2,049

People per sq mi

43.2

Median age

$190,347

Median household income

$82,825

Per capita income

$877,400

Median home value

$2,540

Median monthly rent

92.9%

Home ownership

4.5%

Poverty rate

5.0%

Unemployment

7,803

Housing units

69.2%

Bachelor's or higher

Age distribution

Male Female

532

Under 5

531

1,116

5–9

1,112

1,178

10–14

1,174

958

15–19

956

533

20–24

532

935

25–34

933

1,490

35–44

1,485

2,381

45–54

2,374

792

55–59

790

880

60–64

878

1,352

65–74

1,347

458

75–84

457

229

85+

228

← Male

Female →

Age summary

Group	Count	%
Under 18	7,182	28.0%
18 and over	18,449	72.0%
65 and over	4,071	15.9%
Median age	43.2 years

Race & ethnicity

White 58.6%

Asian 30.4%

Hispanic or Latino 4.2%

Two or more races 3.1%

Other race 2.1%

Black or African American 1.3%

American Indian / Alaska Native 0.3%

Group	Count	%
White	15,678	58.6%
Asian	8,143	30.4%
Hispanic or Latino	1,123	4.2%
Two or more races	837	3.1%
Other race	561	2.1%
Black or African American	336	1.3%
American Indian / Alaska Native	76	0.3%

Household income

Income range	This ZIP	County avg	State avg
Under $50k	14.1%	20.1%	37.0%
$50k – $100k	15.7%	21.8%	27.0%
$100k – $200k	27.3%	33.1%	24.4%
Over $200k	42.9%	25.0%	11.5%

Under $10k 3.3%

$10k–$15k 1.9%

$15k–$25k 2.5%

$25k–$35k 3.1%

$35k–$50k 2.9%

$50k–$75k 5.9%

$75k–$100k 8.1%

$100k–$150k 13.3%

$150k–$200k 11.2%

$200k+ 47.9%

Range	% of households
Under $10k	3.3%
$10k–$15k	1.9%
$15k–$25k	2.5%
$25k–$35k	3.1%
$35k–$50k	2.9%
$50k–$75k	5.9%
$75k–$100k	8.1%
$100k–$150k	13.3%
$150k–$200k	11.2%
$200k+	47.9%
Median income	$190,347

Housing

Home values

Under $50k 0.4%

$50k–$100k 0.2%

$100k–$150k 0.2%

$150k–$200k 0.1%

$200k–$300k 0.1%

$300k–$500k 5.2%

$500k–$1M 60.0%

$1M+ 33.8%

Housing overview

Metric	Value
Median home value	$877,400
Median rent / month	$2,540
Owner occupied	92.9%
Renter occupied	7.1%
Vacant	3.2%
Single-family detached	91.6%
Large apartment buildings	0.6%
Mobile homes	0.1%
Median rooms	7.3
Avg household size (owned)	3.16

Year built

Era	%
2020 or later	0.1%
2010–2019	3.2%
2000–2009	3.6%
1990–1999	2.3%
1980–1989	8.9%
1970–1979	8.9%
1960–1969	15.0%
1950–1959	50.7%
1940–1949	2.9%
1939 or earlier	4.4%

Bedrooms

Size	% of units
No bedroom (studio)	1.8%
1 bedroom	1.6%
2 bedrooms	3.6%
3 bedrooms	41.1%
4 bedrooms	35.8%
5+ bedrooms	16.0%

Vehicles per household

Vehicles	% of households
No vehicle	2.1%
1 vehicle	23.9%
2 vehicles	47.2%
3 or more	26.8%

Heating fuel

Fuel type	%
Utility gas	48.2%
Electricity	6.7%
Propane / LP gas	2.3%
Fuel oil	42.5%
No fuel used	0.1%

Households & families

Household type	Count	%
Married-couple family	6,358	78.4%
Cohabiting couple	145	1.8%
Male householder, no spouse	658	8.1%
Female householder, no spouse	949	11.7%
Households with children under 18	3,844	47.4%
Households with seniors (65+)	2,733	33.7%
Average household size	3.13

Marital status

Status	Male	Female
Never married	25.8%	22.9%
Married	70.0%	65.3%
Separated	0.2%	1.0%
Widowed	1.0%	6.2%
Divorced	3.0%	4.6%

Education

Less than 9th grade 1.9%

Some HS, no diploma 1.9%

HS graduate 11.5%

Some college, no degree 9.2%

Associate's degree 6.3%

Bachelor's degree 33.9%

Graduate / professional 35.3%

Metric	%
HS diploma or higher	96.2%
Bachelor's or higher	69.2%

School enrollment (ages 3–17)

Type	Count	%
Nursery / preschool	444	6.0%
Kindergarten	390	5.2%
Elementary school	3,510	47.1%
High school	2,055	27.6%
College / grad school	1,050	14.1%

Employment

Industry of employment

Education & healthcare 29.3%

Professional & management 17.0%

Finance & real estate 14.3%

Retail trade 8.3%

Arts, food & hospitality 5.7%

Manufacturing 4.4%

Transportation & utilities 4.1%

Wholesale trade 4.0%

Construction 3.3%

Information 3.1%

Other services 3.1%

Public administration 2.8%

Agriculture & mining 0.4%

Occupation

Category	%
Management, business & arts	63.1%
Service	8.2%
Sales & office	20.7%
Natural resources & construction	3.0%
Production & transportation	5.1%

Employment type

Type	%
Private sector	83.5%
Government	11.3%
Self-employed	4.8%
Unpaid family workers	0.5%

Commute

Method	%
Drive alone	57.2%
Carpool	6.3%
Public transit	13.7%
Walk	1.1%
Work from home	20.3%
Other means	1.4%
Avg commute (minutes)	39.0

Poverty

All people 4.5%

Under 18 years 3.7%

18 and over 4.8%

Married-couple families 3.1%

Female-led households 23.2%

Income support

Source	% of households
Social Security	28.6%
Retirement income	22.7%
Supplemental Security	3.2%
Cash public assistance	1.4%
Food stamps / SNAP	3.5%

Health indicators

Condition	%
Obesity	20.2%
High blood pressure	27.9%
High cholesterol	35.3%
Diabetes	7.2%
Heart disease	4.9%
Stroke	2.1%
Asthma	7.6%
Arthritis	19.2%
Kidney disease	2.3%
Pulmonary disease	4.0%
Cancer	7.1%

Behavior / access	%
Smoking	8.8%
Binge drinking	13.6%
No physical activity	16.8%
Less than 7 hrs sleep	31.1%
Depression	13.6%
Fair or poor health	7.5%
Poor mental health	10.3%
Poor physical health	6.4%
No health insurance	7.1%
Visited doctor (checkup)	80.7%
Visited dentist	77.0%
Cholesterol screening	94.5%
Teeth loss	6.3%

Veterans & disability

Veterans	Count	%
Civilian veterans	452	2.4%

Disability	%
Any disability	6.1%
Under 18	1.8%
18–64 years	4.5%
65 and over	19.2%

Health insurance coverage

Type	%
Private insurance	86.2%
Public insurance	23.8%
No insurance	1.8%
Uninsured under 19	1.7%

Language & origin

Language spoken at home (age 5+)

Language	Count	%
English only	24,568	95.9%
Spanish	2,453	10.0%
Other Indo-European	247	1.0%
Asian & Pacific Islander	417	1.7%
Other languages	1,759	7.2%

Place of birth & citizenship

Origin	Count	%
Native born (US)	19,284	75.2%
Born in same state	19,027	74.2%
Born in different state	17,317	67.6%
Foreign born	257	1.0%
Naturalized citizen	6,347	24.8%
Not a US citizen	4,872	76.8%

Ancestry

Ancestry	Count	%
Italian	2,051	8%
Arab	832	3.2%
French	546	2.1%
Irish	250	1%
Norwegian	66	0.3%

Ancestry	Count	%
German	60	0.2%
English	35	0.1%
Dutch	16	0.1%
Polish	10	0%

Technology access

Metric	% of households
Computer access	31.6%
Internet access	97.6%

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

Frequently asked questions about ZIP code 11791

What city is ZIP code 11791 in?

ZIP code 11791 is primarily assigned to Syosset, New York.

What county is ZIP code 11791 in?

ZIP code 11791 falls within Nassau County, New York.

How educated is the population of ZIP code 11791?

69% of residents hold a bachelor's degree or higher — well above the national average of ~33%, reflecting a highly educated population.

Is ZIP code 11791 mostly owner-occupied?

93% of occupied units in ZIP code 11791 are owner-occupied, well above the national average.

What is the median household income in ZIP code 11791?

The median household income in ZIP code 11791 is $190,347, above the national median of ~$75,000.

What is the typical home value in ZIP code 11791?

The median home value in ZIP code 11791 is $877,400.

What timezone is ZIP code 11791 in?

ZIP code 11791 observes the EST timezone.