11784 ZIP Code — Selden, NY

Suffolk County, New York

ZIP code 11784 is located in Selden, New York, within Suffolk County. It covers approximately 5.48 square miles and serves a population of 25,425 residents. This is a standard ZIP code in the Eastern (ET) timezone, served by area code 631.

About ZIP code 11784

The housing stock consists of predominantly single-family detached homes. Most homes were built in the 1960s, giving the area an established character. Median home value is $406,500. Owner-occupancy is high at 87%, well above the national average.

Median household income is $108,913. The poverty rate of 5% is below the national average. 36% 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 30 minutes is near the national average.

Educational attainment is near the national average, with 29% of residents holding a bachelor's degree or higher.

Overall, ZIP code 11784 reflects a community defined by high homeownership and a significant Social Security-dependent population.

25,425

population

5.48

sq mi land

Standard

ZIP type

Eastern (ET)

timezone

11784 ZIP code map

Cities in ZIP code 11784

Below are the cities the US Postal Service accepts for ZIP code 11784. Using any city not on this list may result in mail delivery delays.

City	Status
Selden	Acceptable
Selden	Preferred

Nearby ZIP codes

11727 Coram (1.8 mi) 11738 Farmingville (2.2 mi) 11720 Centereach (2.5 mi) 11776 Port Jefferson Station (3.1 mi) 00501 Holtsville (3.6 mi) 11763 Medford (4 mi) 11742 Holtsville (4.1 mi) 11755 Lake Grove (4.5 mi) 11953 Middle Island (4.5 mi) 11766 Mount Sinai (4.7 mi) 11741 Holbrook (5.2 mi) 11790 Stony Brook (5.3 mi)

Demographics updated 06/2026

Population
Total population	25,425
Population density	4,640 / sq mi
State FIPS	36
County FIPS	103

Geography
Land area	5.48 sq mi
Water area	0.00 sq mi
Latitude	40.8691
Longitude	-73.0360
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	22.5%	22.6%	37.0%
$50k – $100k	32.7%	24.7%	27.0%
$100k – $200k	35.0%	34.6%	24.4%
Over $200k	9.7%	18.0%	11.5%

Demographics & statistics

25,425

Population

4,640

People per sq mi

37.8

Median age

$108,913

Median household income

$41,531

Per capita income

$406,500

Median home value

$2,247

Median monthly rent

87.4%

Home ownership

4.8%

Poverty rate

5.4%

Unemployment

7,482

Housing units

28.6%

Bachelor's or higher

Age distribution

Male Female

834

Under 5

843

693

5–9

700

772

10–14

779

922

15–19

932

874

20–24

883

1,760

25–34

1,777

1,426

35–44

1,441

1,898

45–54

1,918

736

55–59

743

850

60–64

859

1,087

65–74

1,098

550

75–84

555

246

85+

249

← Male

Female →

Age summary

Group	Count	%
Under 18	5,668	22.3%
18 and over	19,757	77.7%
65 and over	3,785	14.9%
Median age	37.8 years

Race & ethnicity

White 62.9%

Hispanic or Latino 11.8%

Two or more races 10.3%

Asian 5.9%

Black or African American 4.9%

Other race 3.9%

American Indian / Alaska Native 0.4%

Group	Count	%
White	18,115	62.9%
Hispanic or Latino	3,388	11.8%
Two or more races	2,954	10.3%
Asian	1,688	5.9%
Black or African American	1,412	4.9%
Other race	1,136	3.9%
American Indian / Alaska Native	120	0.4%

Household income

Income range	This ZIP	County avg	State avg
Under $50k	22.5%	22.6%	37.0%
$50k – $100k	32.7%	24.7%	27.0%
$100k – $200k	35.0%	34.6%	24.4%
Over $200k	9.7%	18.0%	11.5%

Under $10k 2.4%

$10k–$15k 1.7%

$15k–$25k 4.3%

$25k–$35k 3.9%

$35k–$50k 5.2%

$50k–$75k 14.4%

$75k–$100k 15.5%

$100k–$150k 23.4%

$150k–$200k 13.1%

$200k+ 16.3%

Range	% of households
Under $10k	2.4%
$10k–$15k	1.7%
$15k–$25k	4.3%
$25k–$35k	3.9%
$35k–$50k	5.2%
$50k–$75k	14.4%
$75k–$100k	15.5%
$100k–$150k	23.4%
$150k–$200k	13.1%
$200k+	16.3%
Median income	$108,913

Housing

Home values

Under $50k 2.3%

$100k–$150k 1.2%

$150k–$200k 2.7%

$200k–$300k 9.3%

$300k–$500k 65.0%

$500k–$1M 18.4%

$1M+ 1.1%

Housing overview

Metric	Value
Median home value	$406,500
Median rent / month	$2,247
Owner occupied	87.4%
Renter occupied	12.6%
Vacant	3.7%
Single-family detached	84.3%
Large apartment buildings	1.6%
Mobile homes	0.0%
Median rooms	6.5
Avg household size (owned)	3.16

Year built

Era	%
2020 or later	0.0%
2010–2019	1.0%
2000–2009	3.0%
1990–1999	9.3%
1980–1989	8.5%
1970–1979	25.4%
1960–1969	32.2%
1950–1959	12.1%
1940–1949	4.8%
1939 or earlier	3.7%

Bedrooms

Size	% of units
No bedroom (studio)	1.5%
1 bedroom	8.2%
2 bedrooms	13.4%
3 bedrooms	41.4%
4 bedrooms	27.4%
5+ bedrooms	8.1%

Vehicles per household

Vehicles	% of households
No vehicle	2.1%
1 vehicle	26.0%
2 vehicles	43.1%
3 or more	28.7%

Heating fuel

Fuel type	%
Utility gas	41.9%
Electricity	5.2%
Propane / LP gas	4.5%
Fuel oil	47.4%
Wood	0.4%
Solar	0.3%
No fuel used	0.1%

Households & families

Household type	Count	%
Married-couple family	4,960	60.5%
Cohabiting couple	358	4.4%
Male householder, no spouse	1,183	14.4%
Female householder, no spouse	1,703	20.8%
Households with children under 18	3,115	38.0%
Households with seniors (65+)	2,811	34.3%
Average household size	3.09

Marital status

Status	Male	Female
Never married	35.0%	31.9%
Married	53.5%	49.3%
Separated	2.7%	1.3%
Widowed	2.8%	10.6%
Divorced	6.0%	6.9%

Education

Less than 9th grade 2.8%

Some HS, no diploma 3.8%

HS graduate 33.1%

Some college, no degree 19.2%

Associate's degree 12.5%

Bachelor's degree 16.7%

Graduate / professional 11.9%

Metric	%
HS diploma or higher	93.4%
Bachelor's or higher	28.6%

School enrollment (ages 3–17)

Type	Count	%
Nursery / preschool	597	9.7%
Kindergarten	333	5.4%
Elementary school	2,037	33.3%
High school	1,777	29.0%
College / grad school	1,382	22.6%

Employment

Industry of employment

Education & healthcare 28.9%

Retail trade 14.8%

Professional & management 9.5%

Construction 7.5%

Finance & real estate 7.3%

Transportation & utilities 6.8%

Manufacturing 5.9%

Arts, food & hospitality 4.7%

Public administration 4.2%

Wholesale trade 4.0%

Other services 4.0%

Information 2.4%

Occupation

Category	%
Management, business & arts	39.2%
Service	15.7%
Sales & office	25.3%
Natural resources & construction	8.7%
Production & transportation	11.1%

Employment type

Type	%
Private sector	75.2%
Government	20.4%
Self-employed	4.3%
Unpaid family workers	0.1%

Commute

Method	%
Drive alone	81.6%
Carpool	7.1%
Public transit	3.6%
Walk	0.2%
Work from home	6.2%
Other means	1.2%
Avg commute (minutes)	30.2

Poverty

All people 4.8%

Under 18 years 5.8%

18 and over 4.6%

Married-couple families 2.1%

Female-led households 8.9%

Income support

Source	% of households
Social Security	35.5%
Retirement income	24.1%
Supplemental Security	4.3%
Cash public assistance	1.1%
Food stamps / SNAP	5.4%

Health indicators

Condition	%
Obesity	27.4%
High blood pressure	25.8%
High cholesterol	28.0%
Diabetes	7.4%
Heart disease	4.6%
Stroke	2.2%
Asthma	9.6%
Arthritis	17.9%
Kidney disease	2.3%
Pulmonary disease	5.2%
Cancer	5.6%

Behavior / access	%
Smoking	15.6%
Binge drinking	19.4%
No physical activity	21.9%
Less than 7 hrs sleep	34.9%
Depression	17.7%
Fair or poor health	10.4%
Poor mental health	14.2%
Poor physical health	8.3%
No health insurance	11.3%
Visited doctor (checkup)	76.7%
Visited dentist	67.6%
Cholesterol screening	90.6%
Teeth loss	11.0%

Veterans & disability

Veterans	Count	%
Civilian veterans	808	4.1%

Disability	%
Any disability	11.8%
Under 18	2.6%
18–64 years	9.9%
65 and over	33.5%

Health insurance coverage

Type	%
Private insurance	75.1%
Public insurance	33.8%
No insurance	3.9%
Uninsured under 19	2.1%

Language & origin

Language spoken at home (age 5+)

Language	Count	%
English only	23,748	93.4%
Spanish	1,134	4.8%
Other Indo-European	552	2.3%
Asian & Pacific Islander	455	1.9%
Other languages	127	0.5%

Place of birth & citizenship

Origin	Count	%
Native born (US)	22,401	88.1%
Born in same state	22,234	87.4%
Born in different state	21,052	82.8%
Foreign born	167	0.7%
Naturalized citizen	3,024	11.9%
Not a US citizen	2,262	74.8%

Ancestry

Ancestry	Count	%
Italian	3,736	14.7%
Arab	2,333	9.2%
French	898	3.5%
German	108	0.4%
Irish	79	0.3%

Ancestry	Count	%
Polish	68	0.3%
English	47	0.2%
Norwegian	36	0.1%
Dutch	32	0.1%

Technology access

Metric	% of households
Computer access	32.3%
Internet access	97.8%

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

Frequently asked questions about ZIP code 11784

What city is ZIP code 11784 in?

ZIP code 11784 is primarily assigned to Selden, New York.

What county is ZIP code 11784 in?

ZIP code 11784 falls within Suffolk County, New York.

Is ZIP code 11784 mostly owner-occupied?

87% of occupied units in ZIP code 11784 are owner-occupied, well above the national average.

Does ZIP code 11784 have a large retiree population?

36% of households in ZIP code 11784 receive Social Security income, suggesting a significant retiree or disability population.

What is the typical home value in ZIP code 11784?

The median home value in ZIP code 11784 is $406,500.

What is the median household income in ZIP code 11784?

The median household income in ZIP code 11784 is $108,913, above the national median of ~$75,000.

What timezone is ZIP code 11784 in?

ZIP code 11784 observes the EST timezone.