• county
  • FIPS 36103
  • Largest town: Lindenhurst

Suffolk County, New York

Suffolk County had 1,535,909 residents in the Census Vintage 2024 estimate, on 910.9 square miles of land. It ranks 4th of 62 in New York by population and 20th by land area.

Population
1,535,909
#4 of 62 in New York · #27 in US
Area
910.9 sq mi
#20 of 62 in New York · #821 in US
Density
1,686 / sq mi
#9 of 62 in New York · #90 in US
Median household income
$123,219
#2 of 62 in New York · #28 in US

Census Vintage 2024 estimates · SAIPE 2023 income · 2024 Gazetteer land area

Suffolk County within New York. Pin: Albany.

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Tools and pages that start from Suffolk County

Suffolk County population, land area and income

Suffolk County had 1,535,909 residents in the Census Vintage 2024 estimate, on 910.9 square miles of land. It ranks 4th of 62 in New York by population and 20th by land area. That works out to 1,686.1 people per square mile, 17.5 times the US average of 96.3, and in the top tenth nationally.

The median county-equivalent in New York has 85,936 residents, so Suffolk County is 17.9 times that size.

Its SAIPE 2023 median household income of $123,219 is in the top tenth among 3,143 counties with an estimate.

National rank among 3,144

Population

1,535,909

3144th1st

27th of 3,144 (US)

Land area

911 sq mi

3144th1st

821st of 3,144 (US)

Density

1,686.1 / sq mi

3144th1st

90th of 3,144 (US)

Median household income

$123,219

3143rd1st

28th of 3,143 (US)

Rank within New York (62)

Population

1,535,909

62nd1st

4th of 62 (NY)

Land area

911 sq mi

62nd1st

20th of 62 (NY)

Density

1,686.1 / sq mi

62nd1st

9th of 62 (NY)

Median household income

$123,219

62nd1st

2nd of 62 (NY)

How Suffolk County's population changed since 2020

Suffolk County gained 13,734 residents between the July 2020 and July 2024 estimates, a rise of 0.9%. That ranks 12th of 62 in New York for growth. The median New York county changed by -0.8%, and the state as a whole by -1.2%.

Since the April 2020 estimates base, Suffolk County recorded 67,376 births and 59,385 deaths, a natural change of +7,991. Net international migration added +24,442 and net domestic migration, people moving to or from other US counties, came to -23,349. The largest single component was international migration, which added 24,442 people.

1.52M20201.53M20211.53M20221.53M20231.54M2024
Census Vintage 2024 county estimates for July 1 of each year. The axis starts above zero so year-to-year changes are visible.

Components of change, April 2020 to July 2024

Births
67,376
Deaths
59,385
Net international migration
+24,442
Net domestic migration
-23,349
Change, July 2023 to July 2024
+6,880

Where Suffolk County is

The Census internal point of Suffolk County is at 40.943600, -72.692200. It sits in UTM zone 18N. The map shades New York's 62 county-equivalents by population change from 2020 to 2024, darker for faster growth, with Suffolk County outlined. Dots are towns of 1,000+ people with residents in it.

Tompkins County: +5.8%Yates County: -1.3%Suffolk County: +0.9%Broome County: -0.9%Cortland County: -1.7%Fulton County: -2.0%Ulster County: +0.9%Rockland County: +3.2%Essex County: -1.5%Westchester County: +0.5%Niagara County: -1.2%Dutchess County: +1.4%Seneca County: -2.6%Onondaga County: -0.9%Tioga County: -1.6%Erie County: -0.2%Wayne County: -0.5%Delaware County: -0.1%Greene County: -1.8%Schenectady County: +1.9%Allegany County: -0.1%Rensselaer County: -0.1%Monroe County: -0.7%Warren County: -0.5%Livingston County: -0.1%Madison County: -1.3%Jefferson County: -2.5%Sullivan County: +2.5%Lewis County: +0.0%Oswego County: +0.7%Putnam County: +0.8%New York County: -1.1%Columbia County: -1.8%St. Lawrence County: -2.0%Schuyler County: -4.1%Franklin County: -0.3%Steuben County: -1.4%Cayuga County: -2.1%Oneida County: -1.2%Chemung County: -3.1%Herkimer County: -0.7%Schoharie County: +1.3%Cattaraugus County: -2.0%Chautauqua County: -2.6%Chenango County: -2.8%Hamilton County: +0.2%Orange County: +2.7%Washington County: -2.1%Ontario County: +0.6%Bronx County: -5.1%Wyoming County: -1.5%Clinton County: -2.3%Orleans County: -1.0%Montgomery County: +0.3%Nassau County: +0.1%Kings County: -3.6%Genesee County: -1.2%Otsego County: +3.7%Albany County: +1.9%Queens County: -3.1%Richmond County: +0.6%Saratoga County: +1.9%
Change 2020 to 2024
  1. < -2.0%
  2. < -1.2%
  3. < -0.2%
  4. < +0.7%
  5. ≥ +0.7%
no data

Orange pin: Suffolk County internal point. Dark pin: Albany.

Internal point

Decimal
40.943600, -72.692200
DMS
40°56'36.96"N 72°41'31.92"W
UTM
18N 694262.4E 4535060.7N
Geohash
drk2cve1u
Plus code
87G9W8V5+C4

Towns in Suffolk County

22 incorporated places of 1,000+ people have residents in Suffolk County, 123,843 people together, or 8% of the county. Each figure counts only the part of the town inside Suffolk County; towns marked "part" extend into another county. The largest is Lindenhurst with 27,160.

  1. 01Lindenhurst27,160
  2. 02Patchogue12,447
  3. 03Babylon12,193
  4. 04Lake Grove11,109
  5. 05Amityville9,718
  6. 06Port Jefferson8,189
  7. 07Northport7,317
  8. 08Southampton4,693
  9. 09Islandia3,651
  10. 10Lloyd Harbor3,565
  11. 11Brightwaters3,187
  12. 12Sag Harbor2,816
  13. 13Greenport2,591
  14. 14Westhampton Beach2,238
  15. 15Bellport2,211
Census Vintage 2024 subcounty estimates, county parts of incorporated places (SUMLEV 157).

Counties bordering Suffolk County

The Census 2024 county adjacency file lists 7 neighbors for Suffolk County, including 6 across a state line. The most populous is Nassau County, NY, with 1,392,438 residents. Distances run between Census internal points in a straight line.

Distance to Albany and the nearest big city

Albany is 130.2 miles NNW of Suffolk County's internal point in a straight line. The nearest place of 100,000 or more is New Haven, CT (population 137,562), 28.1 miles away. The nearest place of 10,000 or more is Patchogue, NY (population 12,447), 21.1 miles away.

Suffolk County FIPS code

The FIPS code of Suffolk County is 36103: state code 36 for New York plus county code 103. Use it as text, with the leading zero, when joining Census, BLS, or CDC county tables. SAIPE lists its 2023 median household income as $123,219.

Questions people ask

What is the population of Suffolk County, New York?

The Census Vintage 2024 estimate for July 1, 2024 is 1,535,909. That is up 13,734 people (0.9%) from the July 2020 estimate of 1,522,175.

What is the FIPS code of Suffolk County?

36103. The first two digits (36) are New York; the last three (103) identify the county.

What is the largest town in Suffolk County?

Lindenhurst, with 27,160 residents inside Suffolk County in 2024.

Which counties border Suffolk County?

7 county-equivalents border it in the Census 2024 adjacency file: Nassau County, NY; Western Connecticut Planning Region, CT; South Central Connecticut Planning Region, CT; Greater Bridgeport Planning Region, CT; Southeastern Connecticut Planning Region, CT; Lower Connecticut River Valley Planning Region, CT; Washington County, RI.

Sources and data as of

Data as of: Census Vintage 2024 population estimates, 2024 Gazetteer land area and internal points, SAIPE 2023 median household income.

  1. 01Census Vintage 2024 county population estimates
  2. 02Census 2024 Gazetteer, counties
  3. 03Census SAIPE 2023 state and county estimates
  4. 04Census Vintage 2024 subcounty population estimates
  5. 05Census 2024 county adjacency file
  6. 06Census 2024 cartographic boundary file, counties (1:5,000,000)

How every number is computed: methodology. Spotted a wrong figure? Report an error.