11721 ZIP Code — Centerport, NY

Suffolk County, New York

ZIP code 11721 is located in Centerport, New York, within Suffolk County. It covers approximately 2.51 square miles and serves a population of 6,569 residents. This is a standard ZIP code in the Eastern (ET) timezone, served by area code 631.

About ZIP code 11721

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 $720,000. Owner-occupancy is high at 96%, well above the national average.

The gap between median ($204,048) and mean household income suggests income inequality — a small number of higher earners pull the average up. 30% 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.

Educational attainment is high — 71% of residents hold a bachelor's degree or higher, well above the national average of 33%.

Overall, ZIP code 11721 reflects a community defined by a highly educated population, high homeownership, and a significant Social Security-dependent population.

6,569

population

2.51

sq mi land

Standard

ZIP type

Eastern (ET)

timezone

11721 ZIP code map

Cities in ZIP code 11721

Below are the cities the US Postal Service accepts for ZIP code 11721. Using any city not on this list may result in mail delivery delays.

City	Status
Centerport	Acceptable
Centerport	Preferred

Nearby ZIP codes

11740 Greenlawn (1.9 mi) 11768 Northport (2.4 mi) 11743 Huntington (2.6 mi) 11731 East Northport (3.9 mi) 11724 Cold Spring Harbor (4.9 mi) 11746 Huntington Station (5.5 mi) 11725 Commack (6.1 mi) 11754 Kings Park (6.4 mi) 11797 Woodbury (7.4 mi) 11747 Melville (7.8 mi) 11791 Syosset (8.3 mi) 11771 Oyster Bay (8.3 mi)

Demographics updated 06/2026

Population
Total population	6,569
Population density	2,617 / sq mi
State FIPS	36
County FIPS	103

Geography
Land area	2.51 sq mi
Water area	1.44 sq mi
Latitude	40.8944
Longitude	-73.3714
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	13.3%	22.6%	37.0%
$50k – $100k	12.1%	24.7%	27.0%
$100k – $200k	35.0%	34.6%	24.4%
Over $200k	39.6%	18.0%	11.5%

Demographics & statistics

6,569

Population

2,617

People per sq mi

49.3

Median age

$204,048

Median household income

$96,163

Per capita income

$720,000

Median home value

$2,950

Median monthly rent

95.6%

Home ownership

8.8%

Poverty rate

10.1%

Unemployment

2,358

Housing units

70.8%

Bachelor's or higher

Age distribution

Male Female

164

Under 5

167

107

5–9

109

159

10–14

162

334

15–19

341

20–24

319

25–34

326

306

35–44

311

661

45–54

673

310

55–59

315

223

60–64

227

368

65–74

376

154

75–84

157

85+

← Male

Female →

Age summary

Group	Count	%
Under 18	1,368	20.8%
18 and over	5,201	79.2%
65 and over	1,175	17.9%
Median age	49.3 years

Race & ethnicity

White 82.9%

Hispanic or Latino 5.4%

Other race 4.6%

Asian 4.2%

Black or African American 1.7%

Two or more races 1.1%

Group	Count	%
White	5,760	82.9%
Hispanic or Latino	377	5.4%
Other race	322	4.6%
Asian	291	4.2%
Black or African American	117	1.7%
Two or more races	79	1.1%

Household income

Income range	This ZIP	County avg	State avg
Under $50k	13.3%	22.6%	37.0%
$50k – $100k	12.1%	24.7%	27.0%
$100k – $200k	35.0%	34.6%	24.4%
Over $200k	39.6%	18.0%	11.5%

Under $10k 3.2%

$10k–$15k 0.9%

$15k–$25k 3.1%

$25k–$35k 1.5%

$35k–$50k 4.7%

$50k–$75k 4.6%

$75k–$100k 4.5%

$100k–$150k 13.6%

$150k–$200k 13.3%

$200k+ 50.5%

Range	% of households
Under $10k	3.2%
$10k–$15k	0.9%
$15k–$25k	3.1%
$25k–$35k	1.5%
$35k–$50k	4.7%
$50k–$75k	4.6%
$75k–$100k	4.5%
$100k–$150k	13.6%
$150k–$200k	13.3%
$200k+	50.5%
Median income	$204,048

Housing

Home values

Under $50k 2.3%

$50k–$100k 0.3%

$150k–$200k 1.1%

$200k–$300k 0.7%

$300k–$500k 6.5%

$500k–$1M 65.2%

$1M+ 23.9%

Housing overview

Metric	Value
Median home value	$720,000
Median rent / month	$2,950
Owner occupied	95.6%
Renter occupied	4.4%
Vacant	3.0%
Single-family detached	95.8%
Large apartment buildings	0.8%
Mobile homes	0.0%
Median rooms	7.4
Avg household size (owned)	2.79

Year built

Era	%
2020 or later	1.0%
2010–2019	2.0%
2000–2009	3.8%
1990–1999	6.8%
1980–1989	5.5%
1970–1979	11.2%
1960–1969	12.9%
1950–1959	32.0%
1940–1949	6.3%
1939 or earlier	18.6%

Bedrooms

Size	% of units
No bedroom (studio)	0.0%
1 bedroom	2.0%
2 bedrooms	14.2%
3 bedrooms	36.0%
4 bedrooms	37.2%
5+ bedrooms	10.6%

Vehicles per household

Vehicles	% of households
No vehicle	0.8%
1 vehicle	19.2%
2 vehicles	46.5%
3 or more	33.5%

Heating fuel

Fuel type	%
Utility gas	54.3%
Electricity	4.0%
Propane / LP gas	0.9%
Fuel oil	38.4%
Wood	0.8%
Solar	0.4%

Households & families

Household type	Count	%
Married-couple family	1,708	71.5%
Cohabiting couple	89	3.7%
Male householder, no spouse	246	10.3%
Female householder, no spouse	345	14.4%
Households with children under 18	739	30.9%
Households with seniors (65+)	831	34.8%
Average household size	2.75

Marital status

Status	Male	Female
Never married	28.3%	28.0%
Married	63.9%	59.7%
Separated	0.0%	1.1%
Widowed	3.1%	4.6%
Divorced	4.6%	6.7%

Education

Less than 9th grade 1.8%

Some HS, no diploma 0.4%

HS graduate 9.0%

Some college, no degree 11.7%

Associate's degree 6.3%

Bachelor's degree 38.0%

Graduate / professional 32.9%

Metric	%
HS diploma or higher	97.8%
Bachelor's or higher	70.8%

School enrollment (ages 3–17)

Type	Count	%
Nursery / preschool	164	10.3%
Kindergarten	52	3.3%
Elementary school	393	24.7%
High school	598	37.6%
College / grad school	383	24.1%

Employment

Industry of employment

Education & healthcare 36.4%

Professional & management 17.3%

Finance & real estate 9.4%

Construction 8.2%

Retail trade 6.0%

Other services 4.9%

Manufacturing 4.5%

Arts, food & hospitality 2.9%

Transportation & utilities 2.8%

Information 2.7%

Public administration 2.5%

Wholesale trade 1.7%

Agriculture & mining 0.7%

Occupation

Category	%
Management, business & arts	60.3%
Service	11.0%
Sales & office	17.5%
Natural resources & construction	9.2%
Production & transportation	1.9%

Employment type

Type	%
Private sector	79.2%
Government	13.4%
Self-employed	7.5%
Unpaid family workers	0.0%

Commute

Method	%
Drive alone	66.6%
Carpool	3.7%
Public transit	15.4%
Walk	0.7%
Work from home	12.5%
Other means	1.2%
Avg commute (minutes)	35.8

Poverty

All people 8.8%

Under 18 years 10.9%

18 and over 8.2%

Married-couple families 6.0%

Female-led households 13.4%

Income support

Source	% of households
Social Security	30.2%
Retirement income	21.9%
Supplemental Security	1.8%
Cash public assistance	0.9%
Food stamps / SNAP	2.1%

Health indicators

Condition	%
Obesity	25.1%
High blood pressure	28.0%
High cholesterol	32.5%
Diabetes	7.4%
Heart disease	5.1%
Stroke	2.2%
Asthma	9.0%
Arthritis	20.2%
Kidney disease	2.4%
Pulmonary disease	4.6%
Cancer	7.6%

Behavior / access	%
Smoking	10.6%
Binge drinking	17.6%
No physical activity	16.8%
Less than 7 hrs sleep	30.9%
Depression	16.0%
Fair or poor health	8.0%
Poor mental health	11.3%
Poor physical health	7.3%
No health insurance	6.4%
Visited doctor (checkup)	79.9%
Visited dentist	76.7%
Cholesterol screening	94.8%
Teeth loss	6.8%

Veterans & disability

Veterans	Count	%
Civilian veterans	235	4.5%

Disability	%
Any disability	7.4%
Under 18	0.6%
18–64 years	6.7%
65 and over	17.7%

Health insurance coverage

Type	%
Private insurance	90.0%
Public insurance	24.2%
No insurance	0.4%
Uninsured under 19	0.8%

Language & origin

Language spoken at home (age 5+)

Language	Count	%
English only	6,238	95.0%
Spanish	186	3.0%
Other Indo-European	60	1.0%
Asian & Pacific Islander	84	1.3%
Other languages	34	0.5%

Place of birth & citizenship

Origin	Count	%
Native born (US)	6,068	92.4%
Born in same state	6,007	91.4%
Born in different state	5,339	81.3%
Foreign born	61	0.9%
Naturalized citizen	501	7.6%
Not a US citizen	382	76.2%

Ancestry

Ancestry	Count	%
Italian	1,775	27%
French	380	5.8%
Arab	263	4%
Polish	117	1.8%
English	87	1.3%

Ancestry	Count	%
Norwegian	74	1.1%
Irish	60	0.9%
German	55	0.8%
Dutch	27	0.4%

Technology access

Metric	% of households
Computer access	36.4%
Internet access	99.2%

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

Frequently asked questions about ZIP code 11721

What city is ZIP code 11721 in?

ZIP code 11721 is primarily assigned to Centerport, New York.

What county is ZIP code 11721 in?

ZIP code 11721 falls within Suffolk County, New York.

How educated is the population of ZIP code 11721?

71% of residents hold a bachelor's degree or higher — well above the national average of ~33%, reflecting a highly educated population.

Is ZIP code 11721 mostly owner-occupied?

96% of occupied units in ZIP code 11721 are owner-occupied, well above the national average.

What is the median household income in ZIP code 11721?

The median household income in ZIP code 11721 is $204,048, above the national median of ~$75,000.

What is the typical home value in ZIP code 11721?

The median home value in ZIP code 11721 is $720,000.

What timezone is ZIP code 11721 in?

ZIP code 11721 observes the EST timezone.