What is the largest city in Suffolk County, NY?

West Babylon is the largest city or town in Suffolk County, with about 43,570 residents.

How many ZIP codes are in Suffolk County?

Suffolk County includes 107 ZIP Code Tabulation Areas, including 06390, 11701, 11702, 11703, 11704.

What is the population of Suffolk County, NY?

About 1,530,146 people live in Suffolk County, based on American Community Survey 5-year estimates.

What counties border Suffolk County?

Suffolk County borders Nassau County.

Suffolk County, NY: Cities, ZIP Codes & Local Data

Population

1,530,146

Land area

911sq mi

People per sq mi

1,680

ZIP codes

107

Suffolk County at a glance

Suffolk County is about 4 times as dense as New York as a whole.
It is the 4th most populous of 62 counties in New York.
Households here earn a median of $130,686 a year, 52% more than the New York figure of $85,974.
A typical owner-occupied home is valued at $578,400 (36% above New York) and median rent is $2,255 a month.
The biggest population centers are West Babylon (43,570), Coram (39,539) and Central Islip (38,373).

Local data for Suffolk County, NY

Counts from official public data

Housing and community stats

Suffolk County, NY, American Community Survey 2020-2024

Full profile

Median household income

$130,686

Poverty rate

6.4%

Median home value

$578,400

Prices +5.4% in a year

Median rent

$2,255/mo

Homeownership

82.2%

Bachelor's or higher

40.2%

Median age

41.7

Average commute

31.1 min

Largest reported origins and ancestries: Italian Americans (314,782), Irish Americans (247,260), German Americans (168,143).

Home values and rents Income, education and commute

Economy and federal money

Jobs, income, federal spending and pandemic loans

Details

Unemployment rate

3.8%

Sep 2026, +0.2 pts in a year

Average annual pay

$81,119

689,858 jobs, 2025

Income per person

$92,113

BEA, 2024

Federal spending

$11.1B

FY 2026, $7,299 per person

PPP loans

$5B

54,476 loans, 574,954 jobs reported

Campaign donations

$13.1M

Itemized, 2026 cycle

Economy Federal spending PPP loans

How people get to work

Suffolk County, NY, workers 16 and older. American Community Survey 5-year estimates

Drove alone72.1%
Carpooled7.5%
Public transit4.8%
Walked1.4%
Bicycle0.2%
Taxi, ride-hailing, motorcycle or other1.9%
Worked from home12.0%

Average one-way commute: 31.1 minutes for people who do not work from home.

Environment and hazard risk

Suffolk County, NY, from FEMA, NOAA and EPA

Full report

Natural hazard risk

Relatively High

Top: winter weather

Storm events since 1996

1,830

Most often thunderstorm wind

Flood insurance policies

26,160

5.4% of homes, county

July high / Jan low

82° / 21°F

50.0 inches of rain a year

Hazards, floods and storm history Check a flood zone 212 historic places

Health statistics

Share of adults in Suffolk County, NY, CDC PLACES estimates

All 40 measures

Obesity

29.7%

U.S. 33.3% -3.6 pts

Diabetes

10.0%

U.S. 12.1% -2.1 pts

Smoking

9.6%

U.S. 12.8% -3.2 pts

Uninsured (18-64)

7.2%

U.S. 11.1% -3.9 pts

Cities, towns and ZIP codes in Suffolk County

Population shown

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Frequently asked questions

What is the largest city in Suffolk County, NY?: West Babylon is the largest city or town in Suffolk County, with about 43,570 residents.
How many ZIP codes are in Suffolk County?: Suffolk County includes 107 ZIP Code Tabulation Areas, including 06390, 11701, 11702, 11703, 11704.
What is the population of Suffolk County, NY?: About 1,530,146 people live in Suffolk County, based on American Community Survey 5-year estimates.
What counties border Suffolk County?: Suffolk County borders Nassau County.