11742 ZIP Code — Holtsville, NY

Suffolk County, New York

ZIP code 11742 is located in Holtsville, New York, within Suffolk County. It covers approximately 5.15 square miles and serves a population of 13,448 residents. This is a standard ZIP code in the Eastern (ET) timezone, served by area code 631/516.

About ZIP code 11742

The housing stock consists of a mix of housing types. Most homes were built in the 1970s, giving the area an established character. Median home value is $450,900. Owner-occupancy is high at 81%, well above the national average.

Median household income is $126,755. The poverty rate of 5% is below the national average. 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. The average commute of 30 minutes is near the national average.

Educational attainment is near the national average, with 34% of residents holding a bachelor's degree or higher.

Overall, ZIP code 11742 reflects a community defined by high homeownership and a significant Social Security-dependent population.

13,448

population

5.15

sq mi land

Standard

ZIP type

Eastern (ET)

timezone

11742 ZIP code map

Cities in ZIP code 11742

Below are the cities the US Postal Service accepts for ZIP code 11742. Using any city not on this list may result in mail delivery delays.

City	Status
Holtsville	Preferred

Nearby ZIP codes

00501 Holtsville (0.5 mi) 11741 Holbrook (1.4 mi) 00544 Holtsville (1.5 mi) 11738 Farmingville (1.8 mi) 11763 Medford (3.8 mi) 11779 Ronkonkoma (3.8 mi) 11784 Selden (4.1 mi) 11705 Bayport (4.3 mi) 11715 Blue Point (4.3 mi) 11720 Centereach (4.6 mi) 11716 Bohemia (5 mi) 11755 Lake Grove (5.1 mi)

Demographics updated 06/2026

Population
Total population	13,448
Population density	2,611 / sq mi
State FIPS	36
County FIPS	103

Geography
Land area	5.15 sq mi
Water area	0.00 sq mi
Latitude	40.8107
Longitude	-73.0459
Timezone	Eastern (ET)
Area code	631/516

Total population by age

Gender

Race & ethnicity

Economics updated 06/2026

Household income

Income range	This ZIP	County avg	State avg
Under $50k	21.3%	22.6%	37.0%
$50k – $100k	24.6%	24.7%	27.0%
$100k – $200k	37.6%	34.6%	24.4%
Over $200k	16.5%	18.0%	11.5%

Demographics & statistics

13,448

Population

2,611

People per sq mi

39.8

Median age

$126,755

Median household income

$50,452

Per capita income

$450,900

Median home value

$2,145

Median monthly rent

81.1%

Home ownership

5.4%

Poverty rate

2.6%

Unemployment

3,800

Housing units

33.9%

Bachelor's or higher

Age distribution

Male Female

412

Under 5

416

430

5–9

435

309

10–14

312

434

15–19

438

349

20–24

352

797

25–34

806

1,112

35–44

1,125

1,080

45–54

1,093

489

55–59

494

384

60–64

388

620

65–74

626

210

75–84

212

85+

← Male

Female →

Age summary

Group	Count	%
Under 18	2,880	21.4%
18 and over	10,568	78.6%
65 and over	1,793	13.3%
Median age	39.8 years

Race & ethnicity

White 76.1%

Black or African American 6.3%

Hispanic or Latino 6%

Two or more races 3.7%

Asian 3.5%

Other race 3.1%

American Indian / Alaska Native 1.3%

Group	Count	%
White	10,890	76.1%
Black or African American	903	6.3%
Hispanic or Latino	865	6%
Two or more races	531	3.7%
Asian	501	3.5%
Other race	442	3.1%
American Indian / Alaska Native	181	1.3%

Household income

Income range	This ZIP	County avg	State avg
Under $50k	21.3%	22.6%	37.0%
$50k – $100k	24.6%	24.7%	27.0%
$100k – $200k	37.6%	34.6%	24.4%
Over $200k	16.5%	18.0%	11.5%

Under $10k 0.5%

$10k–$15k 3.4%

$15k–$25k 2.9%

$25k–$35k 6.5%

$35k–$50k 6.3%

$50k–$75k 8.2%

$75k–$100k 10.9%

$100k–$150k 22.9%

$150k–$200k 15.0%

$200k+ 23.2%

Range	% of households
Under $10k	0.5%
$10k–$15k	3.4%
$15k–$25k	2.9%
$25k–$35k	6.5%
$35k–$50k	6.3%
$50k–$75k	8.2%
$75k–$100k	10.9%
$100k–$150k	22.9%
$150k–$200k	15.0%
$200k+	23.2%
Median income	$126,755

Housing

Home values

Under $50k 1.4%

$50k–$100k 1.0%

$100k–$150k 2.2%

$150k–$200k 2.7%

$200k–$300k 6.9%

$300k–$500k 51.5%

$500k–$1M 34.4%

Housing overview

Metric	Value
Median home value	$450,900
Median rent / month	$2,145
Owner occupied	81.1%
Renter occupied	18.9%
Vacant	2.3%
Single-family detached	66.7%
Large apartment buildings	5.8%
Mobile homes	0.0%
Median rooms	5.7
Avg household size (owned)	2.95

Year built

Era	%
2020 or later	0.0%
2010–2019	3.7%
2000–2009	10.9%
1990–1999	17.3%
1980–1989	15.4%
1970–1979	28.6%
1960–1969	11.5%
1950–1959	5.5%
1940–1949	5.6%
1939 or earlier	1.5%

Bedrooms

Size	% of units
No bedroom (studio)	0.2%
1 bedroom	7.9%
2 bedrooms	28.8%
3 bedrooms	32.5%
4 bedrooms	23.2%
5+ bedrooms	7.4%

Vehicles per household

Vehicles	% of households
No vehicle	3.5%
1 vehicle	25.5%
2 vehicles	43.4%
3 or more	27.5%

Heating fuel

Fuel type	%
Utility gas	40.1%
Electricity	13.0%
Propane / LP gas	0.7%
Fuel oil	45.2%
Wood	0.4%
No fuel used	0.2%

Households & families

Household type	Count	%
Married-couple family	2,545	55.9%
Cohabiting couple	349	7.7%
Male householder, no spouse	685	15.0%
Female householder, no spouse	976	21.4%
Households with children under 18	1,684	37.0%
Households with seniors (65+)	1,366	30.0%
Average household size	2.94

Marital status

Status	Male	Female
Never married	38.0%	30.9%
Married	53.0%	49.9%
Separated	0.4%	2.0%
Widowed	3.4%	5.5%
Divorced	5.2%	11.8%

Education

Less than 9th grade 4.6%

Some HS, no diploma 5.2%

HS graduate 29.4%

Some college, no degree 17.6%

Associate's degree 9.4%

Bachelor's degree 18.4%

Graduate / professional 15.4%

Metric	%
HS diploma or higher	90.2%
Bachelor's or higher	33.9%

School enrollment (ages 3–17)

Type	Count	%
Nursery / preschool	259	8.3%
Kindergarten	284	9.1%
Elementary school	1,102	35.4%
High school	682	21.9%
College / grad school	786	25.2%

Employment

Industry of employment

Education & healthcare 29.7%

Construction 11.4%

Professional & management 10.4%

Retail trade 8.1%

Finance & real estate 8.0%

Arts, food & hospitality 6.9%

Manufacturing 5.9%

Public administration 5.2%

Transportation & utilities 4.5%

Wholesale trade 3.4%

Other services 3.3%

Information 2.3%

Agriculture & mining 0.9%

Occupation

Category	%
Management, business & arts	43.0%
Service	15.2%
Sales & office	22.1%
Natural resources & construction	10.7%
Production & transportation	9.1%

Employment type

Type	%
Private sector	77.3%
Government	20.0%
Self-employed	2.7%
Unpaid family workers	0.0%

Commute

Method	%
Drive alone	80.2%
Carpool	6.8%
Public transit	4.6%
Walk	0.2%
Work from home	6.4%
Other means	1.8%
Avg commute (minutes)	30.1

Poverty

All people 5.4%

Under 18 years 4.1%

18 and over 5.7%

Married-couple families 1.8%

Female-led households 10.7%

Income support

Source	% of households
Social Security	30.4%
Retirement income	25.3%
Supplemental Security	3.4%
Cash public assistance	1.3%
Food stamps / SNAP	1.4%

Health indicators

Condition	%
Obesity	26.9%
High blood pressure	25.5%
High cholesterol	28.6%
Diabetes	7.1%
Heart disease	4.5%
Stroke	2.1%
Asthma	9.4%
Arthritis	17.9%
Kidney disease	2.2%
Pulmonary disease	5.0%
Cancer	5.8%

Behavior / access	%
Smoking	15.2%
Binge drinking	19.6%
No physical activity	20.9%
Less than 7 hrs sleep	34.6%
Depression	17.6%
Fair or poor health	9.7%
Poor mental health	13.8%
Poor physical health	8.0%
No health insurance	10.4%
Visited doctor (checkup)	76.8%
Visited dentist	69.4%
Cholesterol screening	91.4%
Teeth loss	10.0%

Veterans & disability

Veterans	Count	%
Civilian veterans	465	4.4%

Disability	%
Any disability	7.7%
Under 18	2.2%
18–64 years	5.7%
65 and over	26.4%

Health insurance coverage

Type	%
Private insurance	81.4%
Public insurance	25.3%
No insurance	4.3%
Uninsured under 19	0.9%

Language & origin

Language spoken at home (age 5+)

Language	Count	%
English only	12,620	93.8%
Spanish	864	6.8%
Other Indo-European	313	2.5%
Asian & Pacific Islander	302	2.4%
Other languages	188	1.5%

Place of birth & citizenship

Origin	Count	%
Native born (US)	11,744	87.3%
Born in same state	11,679	86.8%
Born in different state	11,195	83.2%
Foreign born	65	0.5%
Naturalized citizen	1,704	12.7%
Not a US citizen	1,003	58.9%

Ancestry

Ancestry	Count	%
Italian	2,870	21.3%
Arab	1,100	8.2%
French	683	5.1%
Dutch	57	0.4%
Irish	54	0.4%

Ancestry	Count	%
Polish	38	0.3%
English	28	0.2%
German	26	0.2%
Norwegian	8	0.1%

Technology access

Metric	% of households
Computer access	33.9%
Internet access	98.1%

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

Frequently asked questions about ZIP code 11742

What city is ZIP code 11742 in?

ZIP code 11742 is primarily assigned to Holtsville, New York.

What county is ZIP code 11742 in?

ZIP code 11742 falls within Suffolk County, New York.

Is ZIP code 11742 mostly owner-occupied?

81% of occupied units in ZIP code 11742 are owner-occupied, well above the national average.

What is the median household income in ZIP code 11742?

The median household income in ZIP code 11742 is $126,755, above the national median of ~$75,000.

What is the typical home value in ZIP code 11742?

The median home value in ZIP code 11742 is $450,900.

What is the population of ZIP code 11742?

ZIP code 11742 has an estimated population of 13,448 residents, with a density of 2,612 people per square mile.

What timezone is ZIP code 11742 in?

ZIP code 11742 observes the EST timezone.