11740 ZIP Code — Greenlawn, NY

Suffolk County, New York

ZIP code 11740 is located in Greenlawn, New York, within Suffolk County. It covers approximately 3.66 square miles and serves a population of 11,010 residents. This is a standard ZIP code in the Eastern (ET) timezone, served by area code 631.

About ZIP code 11740

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 $631,600. Owner-occupancy is high at 82%, well above the national average.

The gap between median ($144,911) 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. 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. An above-average commute of 38 minutes suggests many residents work outside the immediate area.

Educational attainment is high — 53% of residents hold a bachelor's degree or higher, well above the national average of 33%.

Overall, ZIP code 11740 reflects a community defined by a highly educated population, high homeownership, and a significant Social Security-dependent population.

11,010

population

3.66

sq mi land

Standard

ZIP type

Eastern (ET)

timezone

11740 ZIP code map

Cities in ZIP code 11740

Below are the cities the US Postal Service accepts for ZIP code 11740. Using any city not on this list may result in mail delivery delays.

City	Status
Greenlawn	Preferred

Nearby ZIP codes

11721 Centerport (1.9 mi) 11731 East Northport (2.6 mi) 11743 Huntington (2.8 mi) 11768 Northport (3.5 mi) 11746 Huntington Station (3.7 mi) 11725 Commack (4.7 mi) 11724 Cold Spring Harbor (4.8 mi) 11754 Kings Park (6.1 mi) 11747 Melville (6.2 mi) 11797 Woodbury (6.7 mi) 11729 Deer Park (7.6 mi) 11791 Syosset (7.9 mi)

Demographics updated 06/2026

Population
Total population	11,010
Population density	3,008 / sq mi
State FIPS	36
County FIPS	103

Geography
Land area	3.66 sq mi
Water area	0.00 sq mi
Latitude	40.8684
Longitude	-73.3618
Timezone	Eastern (ET)
Area code	631

Total population by age

Gender

Race & ethnicity

Economics updated 06/2026

Household income

Income range	This ZIP	County avg	State avg
Under $50k	27.9%	22.6%	37.0%
$50k – $100k	16.3%	24.7%	27.0%
$100k – $200k	30.0%	34.6%	24.4%
Over $200k	25.8%	18.0%	11.5%

Demographics & statistics

11,010

Population

3,008

People per sq mi

42.2

Median age

$144,911

Median household income

$57,158

Per capita income

$631,600

Median home value

$1,338

Median monthly rent

81.8%

Home ownership

5.0%

Poverty rate

5.3%

Unemployment

2,944

Housing units

52.8%

Bachelor's or higher

Age distribution

Male Female

225

Under 5

253

365

5–9

408

317

10–14

355

369

15–19

414

372

20–24

416

483

25–34

540

601

35–44

673

741

45–54

830

399

55–59

446

352

60–64

395

511

65–74

572

256

75–84

286

203

85+

228

← Male

Female →

Age summary

Group	Count	%
Under 18	2,497	22.7%
18 and over	8,513	77.3%
65 and over	2,056	18.7%
Median age	42.2 years

Race & ethnicity

White 72.5%

Black or African American 10.5%

Hispanic or Latino 6.3%

Two or more races 4.9%

Asian 3.6%

Other race 2.1%

Group	Count	%
White	8,522	72.5%
Black or African American	1,233	10.5%
Hispanic or Latino	746	6.3%
Two or more races	577	4.9%
Asian	427	3.6%
Other race	251	2.1%

Household income

Income range	This ZIP	County avg	State avg
Under $50k	27.9%	22.6%	37.0%
$50k – $100k	16.3%	24.7%	27.0%
$100k – $200k	30.0%	34.6%	24.4%
Over $200k	25.8%	18.0%	11.5%

Under $10k 6.3%

$10k–$15k 1.0%

$15k–$25k 5.2%

$25k–$35k 3.4%

$35k–$50k 9.3%

$50k–$75k 5.8%

$75k–$100k 6.7%

$100k–$150k 13.4%

$150k–$200k 19.0%

$200k+ 29.8%

Range	% of households
Under $10k	6.3%
$10k–$15k	1.0%
$15k–$25k	5.2%
$25k–$35k	3.4%
$35k–$50k	9.3%
$50k–$75k	5.8%
$75k–$100k	6.7%
$100k–$150k	13.4%
$150k–$200k	19.0%
$200k+	29.8%
Median income	$144,911

Housing

Home values

Under $50k 0.8%

$50k–$100k 0.3%

$100k–$150k 0.3%

$200k–$300k 2.0%

$300k–$500k 19.2%

$500k–$1M 71.2%

$1M+ 6.2%

Housing overview

Metric	Value
Median home value	$631,600
Median rent / month	$1,338
Owner occupied	81.8%
Renter occupied	18.2%
Vacant	1.1%
Single-family detached	82.8%
Large apartment buildings	1.2%
Mobile homes	0.0%
Median rooms	7.4
Avg household size (owned)	3.31

Year built

Era	%
2020 or later	0.0%
2010–2019	3.0%
2000–2009	3.6%
1990–1999	2.4%
1980–1989	6.9%
1970–1979	20.3%
1960–1969	22.8%
1950–1959	23.7%
1940–1949	4.0%
1939 or earlier	13.3%

Bedrooms

Size	% of units
No bedroom (studio)	1.9%
1 bedroom	11.1%
2 bedrooms	4.5%
3 bedrooms	29.9%
4 bedrooms	41.1%
5+ bedrooms	11.4%

Vehicles per household

Vehicles	% of households
No vehicle	6.6%
1 vehicle	22.3%
2 vehicles	42.1%
3 or more	28.9%

Heating fuel

Fuel type	%
Utility gas	52.4%
Electricity	11.4%
Propane / LP gas	1.9%
Fuel oil	32.3%
No fuel used	0.7%

Households & families

Household type	Count	%
Married-couple family	2,152	60.6%
Cohabiting couple	78	2.2%
Male householder, no spouse	368	10.4%
Female householder, no spouse	952	26.8%
Households with children under 18	1,249	35.2%
Households with seniors (65+)	1,505	42.4%
Average household size	3.04

Marital status

Status	Male	Female
Never married	34.9%	27.8%
Married	57.1%	46.1%
Separated	1.1%	2.7%
Widowed	1.4%	13.8%
Divorced	5.6%	9.7%

Education

Less than 9th grade 4.6%

Some HS, no diploma 2.2%

HS graduate 19.5%

Some college, no degree 12.0%

Associate's degree 8.9%

Bachelor's degree 27.2%

Graduate / professional 25.6%

Metric	%
HS diploma or higher	93.2%
Bachelor's or higher	52.8%

School enrollment (ages 3–17)

Type	Count	%
Nursery / preschool	191	6.9%
Kindergarten	106	3.8%
Elementary school	1,211	43.5%
High school	765	27.5%
College / grad school	510	18.3%

Employment

Industry of employment

Education & healthcare 31.7%

Professional & management 14.4%

Retail trade 8.0%

Construction 7.2%

Arts, food & hospitality 7.0%

Manufacturing 6.9%

Finance & real estate 6.8%

Information 4.2%

Wholesale trade 3.6%

Other services 3.4%

Transportation & utilities 3.2%

Public administration 3.2%

Agriculture & mining 0.4%

Occupation

Category	%
Management, business & arts	57.3%
Service	16.1%
Sales & office	15.5%
Natural resources & construction	7.5%
Production & transportation	3.6%

Employment type

Type	%
Private sector	79.5%
Government	14.0%
Self-employed	6.1%
Unpaid family workers	0.4%

Commute

Method	%
Drive alone	74.9%
Carpool	4.2%
Public transit	7.6%
Walk	0.1%
Work from home	12.5%
Other means	0.6%
Avg commute (minutes)	37.5

Poverty

All people 5.0%

Under 18 years 4.5%

18 and over 5.1%

Married-couple families 2.8%

Female-led households 8.3%

Income support

Source	% of households
Social Security	40.5%
Retirement income	31.2%
Supplemental Security	5.0%
Cash public assistance	3.3%
Food stamps / SNAP	10.4%

Health indicators

Condition	%
Obesity	25.7%
High blood pressure	29.4%
High cholesterol	31.9%
Diabetes	8.2%
Heart disease	5.6%
Stroke	2.5%
Asthma	9.1%
Arthritis	21.0%
Kidney disease	2.7%
Pulmonary disease	5.2%
Cancer	7.7%

Behavior / access	%
Smoking	11.7%
Binge drinking	16.8%
No physical activity	19.5%
Less than 7 hrs sleep	32.1%
Depression	15.8%
Fair or poor health	9.5%
Poor mental health	11.7%
Poor physical health	7.9%
No health insurance	8.1%
Visited doctor (checkup)	80.0%
Visited dentist	73.3%
Cholesterol screening	94.0%
Teeth loss	9.0%

Veterans & disability

Veterans	Count	%
Civilian veterans	347	4.1%

Disability	%
Any disability	11.3%
Under 18	5.7%
18–64 years	8.6%
65 and over	27.7%

Health insurance coverage

Type	%
Private insurance	82.2%
Public insurance	30.8%
No insurance	1.0%
Uninsured under 19	1.8%

Language & origin

Language spoken at home (age 5+)

Language	Count	%
English only	10,532	95.7%
Spanish	936	8.9%
Other Indo-European	629	6.0%
Asian & Pacific Islander	145	1.4%
Other languages	162	1.5%

Place of birth & citizenship

Origin	Count	%
Native born (US)	9,185	83.4%
Born in same state	9,004	81.8%
Born in different state	8,330	75.7%
Foreign born	181	1.6%
Naturalized citizen	1,825	16.6%
Not a US citizen	1,295	71.0%

Ancestry

Ancestry	Count	%
Italian	2,059	18.7%
French	806	7.3%
Arab	348	3.2%
Polish	63	0.6%
Irish	33	0.3%

Ancestry	Count	%
German	32	0.3%
Norwegian	21	0.2%
Dutch	14	0.1%
English	10	0.1%

Technology access

Metric	% of households
Computer access	32.2%
Internet access	92.3%

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

Frequently asked questions about ZIP code 11740

What city is ZIP code 11740 in?

ZIP code 11740 is primarily assigned to Greenlawn, New York.

What county is ZIP code 11740 in?

ZIP code 11740 falls within Suffolk County, New York.

How educated is the population of ZIP code 11740?

53% of residents hold a bachelor's degree or higher — well above the national average of ~33%, reflecting a highly educated population.

Is ZIP code 11740 mostly owner-occupied?

82% of occupied units in ZIP code 11740 are owner-occupied, well above the national average.

Does ZIP code 11740 have a large retiree population?

41% of households in ZIP code 11740 receive Social Security income, suggesting a significant retiree or disability population.

What is the median household income in ZIP code 11740?

The median household income in ZIP code 11740 is $144,911, above the national median of ~$75,000.

What timezone is ZIP code 11740 in?

ZIP code 11740 observes the EST timezone.