11780 ZIP Code — Saint James, NY

Suffolk County, New York

ZIP code 11780 is located in Saint James, New York, within Suffolk County. It covers approximately 11.50 square miles and serves a population of 15,617 residents. This is a standard ZIP code in the Eastern (ET) timezone, served by area code 631.

About ZIP code 11780

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 $659,900. Owner-occupancy is high at 89%, well above the national average.

The gap between median ($151,971) 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. 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 32 minutes is near the national average.

Educational attainment is high — 54% of residents hold a bachelor's degree or higher, well above the national average of 33%.

Overall, ZIP code 11780 reflects a community defined by a highly educated population, high homeownership, and a significant Social Security-dependent population.

15,617

population

11.50

sq mi land

Standard

ZIP type

Eastern (ET)

timezone

11780 ZIP code map

Cities in ZIP code 11780

Below are the cities the US Postal Service accepts for ZIP code 11780. Using any city not on this list may result in mail delivery delays.

City	Status
Saint James	Acceptable
Saint James	Preferred

Nearby ZIP codes

11787 Smithtown (2.6 mi) 11790 Stony Brook (3.1 mi) 11794 Stony Brook (3.3 mi) 11754 Kings Park (3.5 mi) 11767 Nesconset (3.9 mi) 11755 Lake Grove (4 mi) 11733 East Setauket (4.4 mi) 11788 Hauppauge (5.3 mi) 11720 Centereach (5.3 mi) 11749 Islandia (6 mi) 11749 Islandia (6 mi) 11779 Ronkonkoma (6.3 mi)

Demographics updated 05/2026

Population
Total population	15,617
Population density	1,358 / sq mi
State FIPS	36
County FIPS	103

Geography
Land area	11.50 sq mi
Water area	3.95 sq mi
Latitude	40.8932
Longitude	-73.1816
Timezone	Eastern (ET)
Area code	631

Total population by age

Gender

Race & ethnicity

Economics updated 05/2026

Household income

Income range	This ZIP	County avg	State avg
Under $50k	18.9%	22.6%	37.0%
$50k – $100k	20.3%	24.7%	27.0%
$100k – $200k	32.0%	34.6%	24.4%
Over $200k	28.9%	18.0%	11.5%

Demographics & statistics

15,617

Population

1,358

People per sq mi

46.3

Median age

$151,971

Median household income

$72,669

Per capita income

$659,900

Median home value

$2,198

Median monthly rent

89.0%

Home ownership

2.1%

Poverty rate

4.3%

Unemployment

5,198

Housing units

53.6%

Bachelor's or higher

Age distribution

Male Female

266

Under 5

283

368

5–9

390

523

10–14

556

578

15–19

613

495

20–24

525

748

25–34

795

720

35–44

765

1,125

45–54

1,195

636

55–59

676

554

60–64

589

800

65–74

849

468

75–84

497

292

85+

311

← Male

Female →

Age summary

Group	Count	%
Under 18	3,117	20.0%
18 and over	12,500	80.0%
65 and over	3,217	20.6%
Median age	46.3 years

Race & ethnicity

White 81.5%

Hispanic or Latino 5.2%

Two or more races 4.7%

Asian 4.5%

Other race 2.4%

Black or African American 1.6%

Group	Count	%
White	13,431	81.5%
Hispanic or Latino	853	5.2%
Two or more races	782	4.7%
Asian	743	4.5%
Other race	402	2.4%
Black or African American	259	1.6%

Household income

Income range	This ZIP	County avg	State avg
Under $50k	18.9%	22.6%	37.0%
$50k – $100k	20.3%	24.7%	27.0%
$100k – $200k	32.0%	34.6%	24.4%
Over $200k	28.9%	18.0%	11.5%

Under $10k 1.3%

$10k–$15k 0.4%

$15k–$25k 3.7%

$25k–$35k 3.6%

$35k–$50k 4.7%

$50k–$75k 8.6%

$75k–$100k 12.1%

$100k–$150k 15.2%

$150k–$200k 14.0%

$200k+ 36.4%

Range	% of households
Under $10k	1.3%
$10k–$15k	0.4%
$15k–$25k	3.7%
$25k–$35k	3.6%
$35k–$50k	4.7%
$50k–$75k	8.6%
$75k–$100k	12.1%
$100k–$150k	15.2%
$150k–$200k	14.0%
$200k+	36.4%
Median income	$151,971

Housing

Home values

Under $50k 0.4%

$50k–$100k 0.7%

$100k–$150k 0.8%

$150k–$200k 0.2%

$200k–$300k 1.8%

$300k–$500k 23.7%

$500k–$1M 55.7%

$1M+ 16.8%

Housing overview

Metric	Value
Median home value	$659,900
Median rent / month	$2,198
Owner occupied	89.0%
Renter occupied	11.0%
Vacant	5.8%
Single-family detached	79.5%
Large apartment buildings	0.6%
Mobile homes	0.0%
Median rooms	7.3
Avg household size (owned)	2.83

Year built

Era	%
2020 or later	0.0%
2010–2019	3.0%
2000–2009	4.7%
1990–1999	11.6%
1980–1989	17.7%
1970–1979	18.1%
1960–1969	21.3%
1950–1959	10.4%
1940–1949	3.4%
1939 or earlier	9.8%

Bedrooms

Size	% of units
No bedroom (studio)	2.7%
1 bedroom	8.5%
2 bedrooms	10.3%
3 bedrooms	31.6%
4 bedrooms	33.7%
5+ bedrooms	13.3%

Vehicles per household

Vehicles	% of households
No vehicle	4.4%
1 vehicle	25.0%
2 vehicles	38.2%
3 or more	32.4%

Heating fuel

Fuel type	%
Utility gas	34.1%
Electricity	13.9%
Propane / LP gas	2.8%
Fuel oil	46.3%
Wood	0.5%
Solar	0.1%
No fuel used	1.8%

Households & families

Household type	Count	%
Married-couple family	3,392	62.1%
Cohabiting couple	242	4.4%
Male householder, no spouse	481	8.8%
Female householder, no spouse	1,348	24.7%
Households with children under 18	1,731	31.7%
Households with seniors (65+)	2,019	37.0%
Average household size	2.78

Marital status

Status	Male	Female
Never married	32.1%	25.2%
Married	58.4%	53.9%
Separated	2.3%	1.5%
Widowed	2.6%	12.2%
Divorced	4.6%	7.2%

Education

Less than 9th grade 1.8%

Some HS, no diploma 2.5%

HS graduate 16.6%

Some college, no degree 16.5%

Associate's degree 9.0%

Bachelor's degree 26.4%

Graduate / professional 27.3%

Metric	%
HS diploma or higher	95.7%
Bachelor's or higher	53.6%

School enrollment (ages 3–17)

Type	Count	%
Nursery / preschool	212	5.6%
Kindergarten	107	2.8%
Elementary school	1,430	37.5%
High school	1,162	30.4%
College / grad school	906	23.7%

Employment

Industry of employment

Education & healthcare 34.5%

Professional & management 15.5%

Retail trade 8.4%

Finance & real estate 8.1%

Construction 7.4%

Manufacturing 6.3%

Arts, food & hospitality 6.2%

Transportation & utilities 3.8%

Public administration 3.2%

Other services 2.4%

Wholesale trade 2.3%

Information 1.9%

Occupation

Category	%
Management, business & arts	55.3%
Service	12.7%
Sales & office	20.5%
Natural resources & construction	5.9%
Production & transportation	5.6%

Employment type

Type	%
Private sector	72.8%
Government	22.1%
Self-employed	5.1%
Unpaid family workers	0.0%

Commute

Method	%
Drive alone	78.2%
Carpool	5.1%
Public transit	3.6%
Walk	1.4%
Work from home	11.1%
Other means	0.7%
Avg commute (minutes)	32.3

Poverty

All people 2.1%

Under 18 years 1.5%

18 and over 2.2%

Married-couple families 0.5%

Female-led households 3.7%

Income support

Source	% of households
Social Security	35.9%
Retirement income	30.9%
Supplemental Security	2.2%
Cash public assistance	2.8%
Food stamps / SNAP	2.8%

Health indicators

Condition	%
Obesity	24.9%
High blood pressure	29.1%
High cholesterol	31.4%
Diabetes	7.8%
Heart disease	5.8%
Stroke	2.5%
Asthma	9.0%
Arthritis	21.3%
Kidney disease	2.7%
Pulmonary disease	5.2%
Cancer	8.1%

Behavior / access	%
Smoking	11.2%
Binge drinking	17.3%
No physical activity	18.8%
Less than 7 hrs sleep	31.2%
Depression	16.0%
Fair or poor health	9.0%
Poor mental health	11.7%
Poor physical health	7.8%
No health insurance	7.5%
Visited doctor (checkup)	79.9%
Visited dentist	74.5%
Cholesterol screening	93.8%
Teeth loss	8.7%

Veterans & disability

Veterans	Count	%
Civilian veterans	562	4.5%

Disability	%
Any disability	8.9%
Under 18	5.1%
18–64 years	5.5%
65 and over	23.8%

Health insurance coverage

Type	%
Private insurance	87.2%
Public insurance	25.4%
No insurance	2.3%
Uninsured under 19	1.5%

Language & origin

Language spoken at home (age 5+)

Language	Count	%
English only	15,068	96.5%
Spanish	320	2.1%
Other Indo-European	199	1.3%
Asian & Pacific Islander	35	0.2%
Other languages	77	0.5%

Place of birth & citizenship

Origin	Count	%
Native born (US)	14,411	92.3%
Born in same state	14,229	91.1%
Born in different state	13,121	84.0%
Foreign born	182	1.2%
Naturalized citizen	1,206	7.7%
Not a US citizen	794	65.8%

Ancestry

Ancestry	Count	%
Italian	3,523	22.6%
Arab	901	5.8%
French	690	4.4%
Polish	166	1.1%
Irish	142	0.9%

Ancestry	Count	%
English	123	0.8%
German	37	0.2%
Dutch	30	0.2%
Norwegian	6	0%

Technology access

Metric	% of households
Computer access	35.0%
Internet access	96.2%

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

Frequently asked questions about ZIP code 11780

What city is ZIP code 11780 in?

ZIP code 11780 is primarily assigned to Saint James, New York.

What county is ZIP code 11780 in?

ZIP code 11780 falls within Suffolk County, New York.

Is ZIP code 11780 mostly owner-occupied?

89% of occupied units in ZIP code 11780 are owner-occupied, well above the national average.

How educated is the population of ZIP code 11780?

54% of residents hold a bachelor's degree or higher — well above the national average of ~33%, reflecting a highly educated population.

Does ZIP code 11780 have a large retiree population?

36% of households in ZIP code 11780 receive Social Security income, suggesting a significant retiree or disability population.

What is the median household income in ZIP code 11780?

The median household income in ZIP code 11780 is $151,971, above the national median of ~$75,000.

What timezone is ZIP code 11780 in?

ZIP code 11780 observes the EST timezone.