11783 ZIP Code — Seaford, NY

Nassau County, New York

ZIP code 11783 is located in Seaford, New York, within Nassau County. It covers approximately 3.54 square miles and serves a population of 21,916 residents. This is a standard ZIP code in the Eastern (ET) timezone, served by area code 516/631.

About ZIP code 11783

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 $603,000. Owner-occupancy is high at 96%, well above the national average.

The gap between median ($157,983) and mean household income suggests income inequality — a small number of higher earners pull the average up. The poverty rate of 2% is below the national average. 35% 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 near the national average, with 45% of residents holding a bachelor's degree or higher.

Overall, ZIP code 11783 reflects a community defined by high homeownership and a significant Social Security-dependent population.

21,916

population

3.54

sq mi land

Standard

ZIP type

Eastern (ET)

timezone

11783 ZIP code map

Cities in ZIP code 11783

Below are the cities the US Postal Service accepts for ZIP code 11783. Using any city not on this list may result in mail delivery delays.

City	Status
Seaford	Preferred

Nearby ZIP codes

11793 Wantagh (1 mi) 11758 Massapequa (2.1 mi) 11710 Bellmore (2.3 mi) 11762 Massapequa Park (2.4 mi) 11566 Merrick (3.1 mi) 11756 Levittown (3.7 mi) 11701 Amityville (4.5 mi) 11702 Babylon (4.5 mi) 11714 Bethpage (4.7 mi) 11554 East Meadow (4.7 mi) 11737 Farmingdale (4.8 mi) 11520 Freeport (4.9 mi)

Demographics updated 06/2026

Population
Total population	21,916
Population density	6,191 / sq mi
State FIPS	36
County FIPS	059

Geography
Land area	3.54 sq mi
Water area	0.04 sq mi
Latitude	40.6736
Longitude	-73.4940
Timezone	Eastern (ET)
Area code	516/631

Total population by age

Gender

Race & ethnicity

Economics updated 06/2026

Household income

Income range	This ZIP	County avg	State avg
Under $50k	8.7%	20.1%	37.0%
$50k – $100k	22.6%	21.8%	27.0%
$100k – $200k	40.0%	33.1%	24.4%
Over $200k	28.6%	25.0%	11.5%

Demographics & statistics

21,916

Population

6,191

People per sq mi

40.9

Median age

$157,983

Median household income

$60,831

Per capita income

$603,000

Median home value

$2,639

Median monthly rent

95.9%

Home ownership

2.3%

Poverty rate

4.5%

Unemployment

7,014

Housing units

44.6%

Bachelor's or higher

Age distribution

Male Female

463

Under 5

448

652

5–9

629

605

10–14

585

880

15–19

850

807

20–24

780

1,524

25–34

1,473

1,130

35–44

1,091

1,453

45–54

1,404

962

55–59

930

736

60–64

711

1,114

65–74

1,076

558

75–84

539

262

85+

254

← Male

Female →

Age summary

Group	Count	%
Under 18	4,530	20.7%
18 and over	17,386	79.3%
65 and over	3,803	17.4%
Median age	40.9 years

Race & ethnicity

White 86.6%

Asian 3.5%

Hispanic or Latino 3%

Two or more races 2.9%

Black or African American 2.6%

Other race 1.3%

American Indian / Alaska Native 0.1%

Group	Count	%
White	19,570	86.6%
Asian	792	3.5%
Hispanic or Latino	686	3%
Two or more races	647	2.9%
Black or African American	579	2.6%
Other race	295	1.3%
American Indian / Alaska Native	33	0.1%

Household income

Income range	This ZIP	County avg	State avg
Under $50k	8.7%	20.1%	37.0%
$50k – $100k	22.6%	21.8%	27.0%
$100k – $200k	40.0%	33.1%	24.4%
Over $200k	28.6%	25.0%	11.5%

Under $10k 0.5%

$10k–$15k 0.6%

$15k–$25k 2.4%

$25k–$35k 2.4%

$35k–$50k 3.7%

$50k–$75k 7.8%

$75k–$100k 7.9%

$100k–$150k 22.9%

$150k–$200k 15.8%

$200k+ 35.9%

Range	% of households
Under $10k	0.5%
$10k–$15k	0.6%
$15k–$25k	2.4%
$25k–$35k	2.4%
$35k–$50k	3.7%
$50k–$75k	7.8%
$75k–$100k	7.9%
$100k–$150k	22.9%
$150k–$200k	15.8%
$200k+	35.9%
Median income	$157,983

Housing

Home values

Under $50k 0.2%

$50k–$100k 0.6%

$100k–$150k 0.5%

$150k–$200k 0.8%

$200k–$300k 0.4%

$300k–$500k 22.5%

$500k–$1M 73.1%

$1M+ 1.9%

Housing overview

Metric	Value
Median home value	$603,000
Median rent / month	$2,639
Owner occupied	95.9%
Renter occupied	4.1%
Vacant	2.8%
Single-family detached	94.1%
Large apartment buildings	1.0%
Mobile homes	0.6%
Median rooms	7.0
Avg household size (owned)	3.09

Year built

Era	%
2020 or later	0.0%
2010–2019	2.6%
2000–2009	2.1%
1990–1999	1.5%
1980–1989	3.5%
1970–1979	6.6%
1960–1969	12.9%
1950–1959	57.0%
1940–1949	4.4%
1939 or earlier	9.5%

Bedrooms

Size	% of units
No bedroom (studio)	0.0%
1 bedroom	2.3%
2 bedrooms	5.2%
3 bedrooms	49.6%
4 bedrooms	33.2%
5+ bedrooms	9.8%

Vehicles per household

Vehicles	% of households
No vehicle	2.2%
1 vehicle	18.3%
2 vehicles	43.3%
3 or more	36.1%

Heating fuel

Fuel type	%
Utility gas	59.6%
Electricity	1.4%
Propane / LP gas	0.5%
Fuel oil	37.9%
No fuel used	0.4%

Households & families

Household type	Count	%
Married-couple family	4,915	69.2%
Cohabiting couple	226	3.2%
Male householder, no spouse	749	10.5%
Female householder, no spouse	1,211	17.1%
Households with children under 18	2,640	37.2%
Households with seniors (65+)	2,493	35.1%
Average household size	3.07

Marital status

Status	Male	Female
Never married	33.4%	28.9%
Married	57.0%	54.9%
Separated	0.3%	1.0%
Widowed	3.9%	8.2%
Divorced	5.4%	7.0%

Education

Less than 9th grade 2.1%

Some HS, no diploma 1.4%

HS graduate 23.5%

Some college, no degree 17.0%

Associate's degree 11.4%

Bachelor's degree 25.4%

Graduate / professional 19.2%

Metric	%
HS diploma or higher	96.5%
Bachelor's or higher	44.6%

School enrollment (ages 3–17)

Type	Count	%
Nursery / preschool	348	6.1%
Kindergarten	184	3.2%
Elementary school	2,038	35.8%
High school	1,557	27.4%
College / grad school	1,562	27.5%

Employment

Industry of employment

Education & healthcare 29.0%

Professional & management 13.5%

Public administration 8.7%

Finance & real estate 8.1%

Construction 7.5%

Arts, food & hospitality 7.1%

Transportation & utilities 5.9%

Retail trade 5.8%

Manufacturing 3.8%

Information 3.7%

Other services 3.7%

Wholesale trade 3.2%

Occupation

Category	%
Management, business & arts	49.5%
Service	16.4%
Sales & office	20.3%
Natural resources & construction	7.5%
Production & transportation	6.2%

Employment type

Type	%
Private sector	75.1%
Government	23.0%
Self-employed	1.9%
Unpaid family workers	0.0%

Commute

Method	%
Drive alone	70.0%
Carpool	6.3%
Public transit	14.5%
Walk	0.6%
Work from home	8.3%
Other means	0.3%
Avg commute (minutes)	38.1

Poverty

All people 2.3%

Under 18 years 3.6%

18 and over 1.9%

Married-couple families 1.1%

Female-led households 4.7%

Income support

Source	% of households
Social Security	34.9%
Retirement income	30.3%
Supplemental Security	5.3%
Cash public assistance	1.6%
Food stamps / SNAP	2.8%

Health indicators

Condition	%
Obesity	23.0%
High blood pressure	27.5%
High cholesterol	34.1%
Diabetes	6.7%
Heart disease	5.1%
Stroke	2.2%
Asthma	8.5%
Arthritis	20.0%
Kidney disease	2.3%
Pulmonary disease	4.7%
Cancer	7.2%

Behavior / access	%
Smoking	11.0%
Binge drinking	16.3%
No physical activity	17.2%
Less than 7 hrs sleep	31.9%
Depression	16.1%
Fair or poor health	8.2%
Poor mental health	12.2%
Poor physical health	7.1%
No health insurance	8.2%
Visited doctor (checkup)	79.5%
Visited dentist	75.8%
Cholesterol screening	93.4%
Teeth loss	7.8%

Veterans & disability

Veterans	Count	%
Civilian veterans	693	4.0%

Disability	%
Any disability	8.9%
Under 18	3.6%
18–64 years	5.0%
65 and over	29.6%

Health insurance coverage

Type	%
Private insurance	89.1%
Public insurance	25.7%
No insurance	1.9%
Uninsured under 19	3.2%

Language & origin

Language spoken at home (age 5+)

Language	Count	%
English only	21,005	95.8%
Spanish	741	3.5%
Other Indo-European	378	1.8%
Asian & Pacific Islander	230	1.1%
Other languages	121	0.6%

Place of birth & citizenship

Origin	Count	%
Native born (US)	20,135	91.9%
Born in same state	19,935	91.0%
Born in different state	19,061	87.0%
Foreign born	200	0.9%
Naturalized citizen	1,781	8.1%
Not a US citizen	1,662	93.3%

Ancestry

Ancestry	Count	%
Italian	4,853	22.1%
French	1,038	4.7%
Arab	806	3.7%
German	324	1.5%
Polish	222	1%

Ancestry	Count	%
English	141	0.6%
Irish	63	0.3%
Norwegian	58	0.3%
Dutch	45	0.2%

Technology access

Metric	% of households
Computer access	32.4%
Internet access	97.1%

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

Frequently asked questions about ZIP code 11783

What city is ZIP code 11783 in?

ZIP code 11783 is primarily assigned to Seaford, New York.

What county is ZIP code 11783 in?

ZIP code 11783 falls within Nassau County, New York.

Is ZIP code 11783 mostly owner-occupied?

96% of occupied units in ZIP code 11783 are owner-occupied, well above the national average.

What is the median household income in ZIP code 11783?

The median household income in ZIP code 11783 is $157,983, above the national median of ~$75,000.

What is the typical home value in ZIP code 11783?

The median home value in ZIP code 11783 is $603,000.

What is the population of ZIP code 11783?

ZIP code 11783 has an estimated population of 21,916 residents, with a density of 6,187 people per square mile.

What timezone is ZIP code 11783 in?

ZIP code 11783 observes the EST timezone.