Suffolk County, New York

County seat: Riverhead · Population 1.5 million (2025) · 911 sq mi

Suffolk County is the 4th most populous of New York's 62 counties, with 1,546,090 people (2025 estimate). Its county seat is Riverhead. The map shows its 32 cities and towns and the 7 neighboring counties.

Map of Suffolk County, New York with cities, towns and the county boundary
Suffolk County, New York with its cities and towns, unincorporated communities (CDPs) and neighboring counties. Boundaries: U.S. Census Bureau, 2025. Free to use with attribution (CC BY 4.0).
Download PDF (Letter) 338 KBPNG image 194 KBNew York county map

Suffolk County facts

County seat
Riverhead
Population (2025 estimate)
1,546,090 +1.3% since 2020
Land area
911 sq mi 20th largest of 62
Water area
1,462 sq mi
Population density
1,697 per sq mi
Established
1683
Named after
Suffolk county of England
Largest city
Brookhaven 496,410
Median household income
$130,686
Cities and towns
32 plus 125 CDPs
ZIP codes
109
Time zone
Eastern
FIPS code
36103

Cities and towns in Suffolk County

Suffolk County has 32 incorporated cities, towns and villages. Populations count the people living inside Suffolk County; cities that cross a county line also list the other counties.

NameTypePopulation 2025Also in
LindenhurstVillage27,258
PatchogueVillage12,486
BabylonVillage12,281
Lake GroveVillage11,168
AmityvilleVillage9,799
Port JeffersonVillage8,306
NorthportVillage7,336
SouthamptonVillage4,730
IslandiaVillage3,733
Lloyd HarborVillage3,587
BrightwatersVillage3,208
Sag HarborVillage2,841
GreenportVillage2,590
Westhampton BeachVillage2,273
BellportVillage2,220
Village of the BranchVillage1,764
QuogueVillage1,703
NissequogueVillage1,638
East HamptonVillage1,552
Head of the HarborVillage1,481
Huntington BayVillage1,459
North HavenVillage1,215
Old FieldVillage947
PoquottVillage932
Belle TerreVillage796
SagaponackVillage752
AsharokenVillage624
ShorehamVillage530
Ocean BeachVillage175
West Hampton DunesVillage120
SaltaireVillage111
Dering HarborVillage36

Unincorporated communities (CDPs)

Census-designated places are communities without their own city government; the county provides their services.

CommunityPopulationAlso in
West Babylon43,570
Coram39,539
Central Islip38,373
Commack36,558
Huntington Station32,601
Centereach31,839
Bay Shore31,683
Shirley28,375
Deer Park27,990
West Islip26,865
Holbrook26,449
Medford24,796
Dix Hills24,773
Smithtown24,375
Copiague23,424
East Patchogue21,673
Selden21,604
North Amityville21,138
Hauppauge20,793
North Bay Shore20,282
Huntington19,948
Melville19,714
East Northport19,700
Holtsville19,344
Ronkonkoma18,709
Lake Ronkonkoma18,221
North Babylon17,963
Islip17,362
Mastic Beach16,735
Kings Park16,516
Farmingville16,160
Mastic15,708
Hampton Bays15,706
Sayville15,408
Greenlawn15,210
Riverhead14,936
Manorville14,233
Nesconset13,833
East Islip13,573
Rocky Point13,356
St. James13,244
Stony Brook12,868
Ridge12,503
Elwood11,762
Miller Place11,736
Mount Sinai11,093
North Bellport11,087
Middle Island11,027
North Lindenhurst10,952
Terryville10,794
Fort Salonga10,199
East Setauket10,149
South Huntington9,779
Stony Brook University9,530
Bohemia9,181
Springs9,163
Center Moriches9,127
Bayport8,921
Wading River8,359
Baywood8,176
Port Jefferson Station7,676
East Shoreham7,321
Sound Beach7,210
Oakdale7,115
North Patchogue6,984
Yaphank6,934
Flanders6,609
North Sea6,458
Southold6,397
East Moriches6,260
Centerport6,072
East Hampton North6,006
East Farmingdale5,666
Calverton5,618
East Quogue5,406
West Hills5,369
Northwest Harbor5,205
Islip Terrace5,168
West Sayville4,800
Noyack4,782
Blue Point4,735
Wheatley Heights4,729
Mattituck4,606
Gordon Heights4,230
Montauk4,223
West Bay Shore4,208
Setauket4,069
Riverside4,038
North Great River3,909
Westhampton3,900
Cold Spring Harbor3,220
Brookhaven2,858
Cutchogue2,835
Water Mill2,764
Halesite2,661
Baiting Hollow2,614
Shinnecock Hills2,545
Greenport West2,463
Eastport2,414
Moriches2,308
Shelter Island2,125
Northville1,912
Great River1,899
Aquebogue1,869
Jamesport1,593
Remsenburg-Speonk1,564
Bridgehampton1,531
Laurel1,360
East Marion1,331
Tuckahoe1,249
Shelter Island Heights1,230
Eatons Neck1,173
Orient1,121
Quiogue941
Peconic848
Amagansett821
Wainscott612
Northampton499
Fire Island352
New Suffolk298
Captree282
Gilgo148
Fishers Island72
Napeague70
Oak Beach69

ZIP codes in Suffolk County

109 ZIP codes reach into Suffolk County. ZIP codes ignore county lines, so some also cover a neighboring county.

Population of Suffolk County, 2020–2025

Suffolk County grew by 20,170 people (+1.3%) between April 2020 and July 2025: 9,244 more births than deaths and a net gain of 10,031 people from migration.

Year (July 1)Population
20201,521,964
20211,533,742
20221,531,736
20231,533,173
20241,543,330
20251,546,090

Neighboring counties

Printable Suffolk County map

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Sources

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