Nassau County, New York

County seat: Mineola · Population 1.4 million (2025) · 285 sq mi

Nassau County is the 6th most populous of New York's 62 counties, with 1,398,939 people (2025 estimate). Its county seat is Mineola. The map shows its 66 cities and towns and the 5 neighboring counties.

Map of Nassau County, New York with cities, towns and the county boundary
Nassau 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).
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Nassau County facts

County seat
Mineola
Population (2025 estimate)
1,398,939 +0.2% since 2020
Land area
285 sq mi 54th largest of 62
Water area
169 sq mi
Population density
4,916 per sq mi
Established
1899
Named after
William III of England King of England, Scotland, and Ireland from 1689 to 1702 (1650-1702)
Largest city
Hempstead 795,734
Median household income
$146,202
Cities and towns
66 plus 67 CDPs
ZIP codes
70
Time zone
Eastern
FIPS code
36059

Cities and towns in Nassau County

Nassau County has 66 incorporated cities, towns and villages. Populations count the people living inside Nassau County; cities that cross a county line also list the other counties.

NameTypePopulation 2025Also in
HempsteadVillage59,819
FreeportVillage44,174
Valley StreamVillage40,379
Long BeachCity34,918
Glen CoveCity28,190
Rockville CentreVillage25,770
Garden CityVillage23,043
Mineola (county seat)Village21,376
LynbrookVillage20,855
Massapequa ParkVillage16,997
Floral ParkVillage16,105
WestburyVillage15,981
Great NeckVillage11,141
New Hyde ParkVillage10,226
East RockawayVillage10,096
FarmingdaleVillage8,584
MalverneVillage8,476
Great Neck PlazaVillage7,889
Williston ParkVillage7,524
CedarhurstVillage7,334
East HillsVillage7,328
ManorhavenVillage7,135
LawrenceVillage6,847
BayvilleVillage6,780
Kings PointVillage5,710
North HillsVillage5,481
Old WestburyVillage5,071
Island ParkVillage5,069
Sea CliffVillage5,031
Flower HillVillage4,860
MuttontownVillage3,568
Port Washington NorthVillage3,154
Great Neck EstatesVillage3,139
BrookvilleVillage3,037
RoslynVillage3,025
Lake SuccessVillage2,849
Munsey ParkVillage2,787
ThomastonVillage2,776
Sands PointVillage2,764
East WillistonVillage2,616
Oyster Bay CoveVillage2,288
Old BrookvilleVillage2,098
Laurel HollowVillage1,949
Stewart ManorVillage1,925
LattingtownVillage1,881
Upper BrookvilleVillage1,778
South Floral ParkVillage1,773
Atlantic BeachVillage1,723
PlandomeVillage1,482
Roslyn EstatesVillage1,333
Hewlett HarborVillage1,332
KensingtonVillage1,278
BelleroseVillage1,169
Roslyn HarborVillage1,113
Plandome HeightsVillage1,019
Baxter EstatesVillage1,014
Mill NeckVillage1,010
Saddle RockVillage1,008
Russell GardensVillage900
WoodsburghVillage885
MatinecockVillage854
Plandome ManorVillage823
Hewlett NeckVillage574
Hewlett Bay ParkVillage480
Centre IslandVillage394
Cove NeckVillage293

Unincorporated communities (CDPs)

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

CommunityPopulationAlso in
Levittown51,904
Hicksville43,780
East Meadow36,821
Elmont36,518
Baldwin34,994
Uniondale33,148
Oceanside31,639
Franklin Square30,897
Plainview25,982
Merrick21,744
Massapequa21,389
North Bellmore20,689
West Hempstead20,648
East Massapequa20,377
Roosevelt18,885
Syosset18,433
Wantagh18,365
Woodmere18,061
Port Washington18,004
North Massapequa17,877
North Valley Stream17,825
Bethpage17,123
Bellmore15,954
Seaford15,549
South Farmingdale14,676
New Cassel14,551
North New Hyde Park14,159
Jericho13,759
Salisbury12,412
North Merrick12,366
Inwood12,235
North Wantagh11,940
Woodbury9,348
Plainedge8,624
Garden City Park7,914
Manhasset7,716
Hewlett7,570
Oyster Bay7,308
Roslyn Heights6,975
Old Bethpage6,546
South Valley Stream6,512
Lakeview5,825
Carle Place5,188
Albertson4,891
Searingtown4,720
Glen Head4,653
Locust Valley4,153
University Gardens4,110
Garden City South4,075
Herricks3,907
Glenwood Landing3,896
Manhasset Hills3,692
South Hempstead3,108
East Norwich2,697
Lido Beach2,495
Barnum Island2,302
Bellerose Terrace2,006
East Atlantic Beach1,825
Bay Park1,510
Great Neck Gardens1,492
Harbor Isle1,176
Greenvale1,113
Point Lookout945
North Lynbrook922
Malverne Park Oaks635
Saddle Rock Estates485
Harbor Hills458

ZIP codes in Nassau County

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

Population of Nassau County, 2020–2025

Nassau County grew by 3,163 people (+0.2%) between April 2020 and July 2025: 9,816 more births than deaths and a net loss of 7,776 people from migration.

Year (July 1)Population
20201,390,952
20211,391,787
20221,388,346
20231,388,940
20241,397,783
20251,398,939

Neighboring counties

Printable Nassau County map

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Sources

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