11724 ZIP Code — Cold Spring Harbor, NY

Suffolk County, New York

ZIP code 11724 is located in Cold Spring Harbor, New York, within Suffolk County. It covers approximately 3.86 square miles and serves a population of 2,874 residents. This is a standard ZIP code in the Eastern (ET) timezone, served by area code 516/631.

About ZIP code 11724

The housing stock consists of predominantly single-family detached homes. Most homes were built in the pre-1940, giving the area an established character. Median home value is $1,480,400. Owner-occupancy is high at 97%, well above the national average.

Median household income is $250,001.

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. Remote work is prevalent — 26% of workers work from home.

Educational attainment is high — 80% of residents hold a bachelor's degree or higher, well above the national average of 33%.

Overall, ZIP code 11724 reflects a community defined by a highly educated population, high homeownership, and a high rate of remote workers.

2,874

population

3.86

sq mi land

Standard

ZIP type

Eastern (ET)

timezone

11724 ZIP code map

Cities in ZIP code 11724

Below are the cities the US Postal Service accepts for ZIP code 11724. Using any city not on this list may result in mail delivery delays.

City	Status
Cold Spring Harbor	Acceptable
Cold Spring Harbor	Preferred

Nearby ZIP codes

11743 Huntington (2.2 mi) 11797 Woodbury (3.1 mi) 11791 Syosset (3.5 mi) 11771 Oyster Bay (4 mi) 11740 Greenlawn (4.8 mi) 11721 Centerport (4.9 mi) 11732 East Norwich (4.9 mi) 11765 Mill Neck (5.7 mi) 11746 Huntington Station (5.7 mi) 11747 Melville (5.8 mi) 11709 Bayville (6.3 mi) 11853 Jericho (6.6 mi)

Demographics updated 06/2026

Population
Total population	2,874
Population density	745 / sq mi
State FIPS	36
County FIPS	103

Geography
Land area	3.86 sq mi
Water area	0.49 sq mi
Latitude	40.8612
Longitude	-73.4534
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	10.9%	22.6%	37.0%
$50k – $100k	8.0%	24.7%	27.0%
$100k – $200k	20.4%	34.6%	24.4%
Over $200k	60.6%	18.0%	11.5%

Demographics & statistics

2,874

Population

745

People per sq mi

38.5

Median age

$250,001

Median household income

$92,315

Per capita income

$1,480,400

Median home value

Median monthly rent

96.8%

Home ownership

2.0%

Poverty rate

2.4%

Unemployment

1,011

Housing units

80.4%

Bachelor's or higher

Age distribution

Male Female

129

Under 5

112

149

5–9

129

10–14

126

15–19

108

20–24

139

25–34

119

149

35–44

128

245

45–54

211

123

55–59

106

102

60–64

136

65–74

117

75–84

85+

← Male

Female →

Age summary

Group	Count	%
Under 18	860	29.9%
18 and over	2,014	70.1%
65 and over	388	13.5%
Median age	38.5 years

Race & ethnicity

White 82%

Two or more races 6.9%

Hispanic or Latino 5.3%

Other race 3.1%

Asian 2.8%

Group	Count	%
White	2,488	82%
Two or more races	209	6.9%
Hispanic or Latino	161	5.3%
Other race	93	3.1%
Asian	84	2.8%

Household income

Income range	This ZIP	County avg	State avg
Under $50k	10.9%	22.6%	37.0%
$50k – $100k	8.0%	24.7%	27.0%
$100k – $200k	20.4%	34.6%	24.4%
Over $200k	60.6%	18.0%	11.5%

Under $10k 3.5%

$15k–$25k 0.6%

$25k–$35k 1.6%

$35k–$50k 2.4%

$50k–$75k 10.1%

$75k–$100k 1.1%

$100k–$150k 7.8%

$150k–$200k 13.3%

$200k+ 59.6%

Range	% of households
Under $10k	3.5%
$15k–$25k	0.6%
$25k–$35k	1.6%
$35k–$50k	2.4%
$50k–$75k	10.1%
$75k–$100k	1.1%
$100k–$150k	7.8%
$150k–$200k	13.3%
$200k+	59.6%
Median income	$250,001

Housing

Home values

$300k–$500k 1.2%

$500k–$1M 12.6%

$1M+ 86.3%

Housing overview

Metric	Value
Median home value	$1,480,400
Median rent / month	$0
Owner occupied	96.8%
Renter occupied	3.2%
Vacant	7.6%
Single-family detached	94.3%
Large apartment buildings	0.0%
Mobile homes	0.0%
Median rooms	10.0
Avg household size (owned)	2.95

Year built

Era	%
2020 or later	0.0%
2010–2019	1.7%
2000–2009	2.5%
1990–1999	10.1%
1980–1989	4.5%
1970–1979	10.3%
1960–1969	17.1%
1950–1959	21.2%
1940–1949	2.0%
1939 or earlier	30.6%

Bedrooms

Size	% of units
No bedroom (studio)	1.2%
1 bedroom	0.0%
2 bedrooms	4.0%
3 bedrooms	29.6%
4 bedrooms	37.7%
5+ bedrooms	27.4%

Vehicles per household

Vehicles	% of households
No vehicle	6.1%
1 vehicle	16.4%
2 vehicles	41.3%
3 or more	36.1%

Heating fuel

Fuel type	%
Utility gas	41.4%
Electricity	2.1%
Propane / LP gas	1.9%
Fuel oil	54.6%

Households & families

Household type	Count	%
Married-couple family	685	71.1%
Cohabiting couple	0	0.0%
Male householder, no spouse	139	14.4%
Female householder, no spouse	139	14.4%
Households with children under 18	460	47.8%
Households with seniors (65+)	302	31.4%
Average household size	2.89

Marital status

Status	Male	Female
Never married	25.8%	18.4%
Married	63.9%	67.2%
Separated	3.4%	2.1%
Widowed	3.4%	7.7%
Divorced	3.5%	4.7%

Education

Less than 9th grade 2.8%

Some HS, no diploma 0.6%

HS graduate 6.3%

Some college, no degree 6.8%

Associate's degree 3.2%

Bachelor's degree 39.3%

Graduate / professional 41.1%

Metric	%
HS diploma or higher	96.6%
Bachelor's or higher	80.4%

School enrollment (ages 3–17)

Type	Count	%
Nursery / preschool	125	13.2%
Kindergarten	87	9.2%
Elementary school	347	36.8%
High school	198	21.0%
College / grad school	187	19.8%

Employment

Industry of employment

Education & healthcare 26.6%

Finance & real estate 18.0%

Professional & management 16.7%

Construction 6.3%

Retail trade 6.3%

Transportation & utilities 5.2%

Arts, food & hospitality 5.1%

Manufacturing 4.1%

Information 4.0%

Wholesale trade 3.2%

Agriculture & mining 2.3%

Other services 1.7%

Public administration 0.5%

Occupation

Category	%
Management, business & arts	68.8%
Service	5.9%
Sales & office	20.1%
Natural resources & construction	3.9%
Production & transportation	1.4%

Employment type

Type	%
Private sector	86.1%
Government	8.2%
Self-employed	5.7%
Unpaid family workers	0.0%

Commute

Method	%
Drive alone	48.7%
Carpool	2.7%
Public transit	15.5%
Walk	2.6%
Work from home	25.9%
Other means	4.5%
Avg commute (minutes)	37.9

Poverty

All people 2.0%

Under 18 years 0.1%

18 and over 2.8%

Married-couple families 0.4%

Female-led households 0.0%

Income support

Source	% of households
Social Security	21.2%
Retirement income	17.5%
Supplemental Security	0.9%
Cash public assistance	0.0%
Food stamps / SNAP	3.6%

Health indicators

Condition	%
Obesity	23.9%
High blood pressure	26.3%
High cholesterol	31.7%
Diabetes	6.7%
Heart disease	4.6%
Stroke	1.9%
Asthma	8.8%
Arthritis	18.8%
Kidney disease	2.2%
Pulmonary disease	4.0%
Cancer	7.2%

Behavior / access	%
Smoking	9.3%
Binge drinking	17.9%
No physical activity	15.5%
Less than 7 hrs sleep	30.1%
Depression	15.5%
Fair or poor health	7.1%
Poor mental health	10.9%
Poor physical health	6.6%
No health insurance	5.9%
Visited doctor (checkup)	79.6%
Visited dentist	78.4%
Cholesterol screening	94.7%
Teeth loss	6.0%

Veterans & disability

Veterans	Count	%
Civilian veterans	68	3.4%

Disability	%
Any disability	1.7%
Under 18	0.0%
18–64 years	2.7%
65 and over	1.3%

Health insurance coverage

Type	%
Private insurance	92.9%
Public insurance	14.7%
No insurance	1.5%
Uninsured under 19	0.0%

Language & origin

Language spoken at home (age 5+)

Language	Count	%
English only	2,633	91.6%
Spanish	60	2.3%
Other Indo-European	7	0.3%
Asian & Pacific Islander	53	2.0%
Other languages	0	0.0%

Place of birth & citizenship

Origin	Count	%
Native born (US)	2,682	93.3%
Born in same state	2,647	92.1%
Born in different state	2,102	73.1%
Foreign born	35	1.2%
Naturalized citizen	192	6.7%
Not a US citizen	117	60.9%

Ancestry

Ancestry	Count	%
Italian	702	24.4%
French	312	10.9%
English	59	2.1%
Arab	54	1.9%

Ancestry	Count	%
Irish	18	0.6%
Norwegian	7	0.2%
Polish	3	0.1%

Technology access

Metric	% of households
Computer access	33.5%
Internet access	98.4%

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

Frequently asked questions about ZIP code 11724

What city is ZIP code 11724 in?

ZIP code 11724 is primarily assigned to Cold Spring Harbor, New York.

What county is ZIP code 11724 in?

ZIP code 11724 falls within Suffolk County, New York.

How educated is the population of ZIP code 11724?

80% of residents hold a bachelor's degree or higher — well above the national average of ~33%, reflecting a highly educated population.

Is ZIP code 11724 mostly owner-occupied?

97% of occupied units in ZIP code 11724 are owner-occupied, well above the national average.

What is the median household income in ZIP code 11724?

The median household income in ZIP code 11724 is $250,001, above the national median of ~$75,000.

What is the typical home value in ZIP code 11724?

The median home value in ZIP code 11724 is $1,480,400.

What timezone is ZIP code 11724 in?

ZIP code 11724 observes the EST timezone.