Suffolk County, New York

Suffolk County profile, demographic data, and geographic information.

Local Government & Public Administration

Authoritative general-purpose local government units serving this area U.S. Census Bureau GUS (2026) / GMAF

Government Unit	Unit Type	Jurisdiction Role	Contact / Address
COUNTY OF SUFFOLK GUS Population: 1,535,909 (2024) ID: 170437	County	Official County Government	Contact: MUNICIPAL LAW BUREAU CHIEF PO BOX 6100, HAUPPAUGE NY 11788-0099
TOWN OF BROOKHAVEN GUS Population: 492,759 (2024) ID: 171023	Township	Municipal Government Within County	Contact: ACCESSOR 1 INDEPENDENCE HILL, FARMINGVILLE NY 11738-2150
TOWN OF ISLIP GUS Population: 339,170 (2024) ID: 109708	Township	Municipal Government Within County	Contact: COMMISSIONER OF PLANNING DEVELOPMENT 655 MAIN ST, ISLIP NY 11751-3611
TOWN OF BABYLON GUS Population: 218,566 (2024) ID: 184112	Township	Municipal Government Within County	Contact: ADMINISTRATOR 200 SUNRISE HWY, LINDENHURST NY 11757-2597
TOWN OF HUNTINGTON GUS Population: 204,706 (2024) ID: 171024	Township	Municipal Government Within County	Contact: COMPTROLLER 100 MAIN ST, HUNTINGTON NY 11743-6978
TOWN OF SMITHTOWN GUS Population: 116,228 (2024) ID: 171026	Township	Municipal Government Within County	Contact: PLANNING & COMMUNITY DEVLOPMENT DEPT PO BOX 575, 99 W MAIN ST, SMITHTOWN NY 11787-0575
TOWN OF SOUTHAMPTON GUS Population: 70,646 (2024) ID: 171027	Township	Municipal Government Within County	Contact: TOWN SUPERVISOR 116 HAMPTON RD, SOUTHAMPTON NY 11968-4998
TOWN OF RIVERHEAD GUS Population: 36,067 (2024) ID: 131438	Township	Municipal Government Within County	Contact: TOWN SUPERVISOR 200 HOWELL AVE, RIVERHEAD NY 11901-2587
TOWN OF EAST HAMPTON GUS Population: 29,090 (2024) ID: 208920	Township	Municipal Government Within County	Contact: HUMAN RESOURCES 159 PANTIGO RD, EAST HAMPTON NY 11937-5901
VILLAGE OF LINDENHURST GUS Population: 27,160 (2024) ID: 170648	Municipal	Municipal Government Within County	Contact: VILLAGE MAYOR 430 S WELLWOOD AVE, LINDENHURST NY 11757-4979
TOWN OF SOUTHOLD GUS Population: 24,083 (2024) ID: 184106	Township	Municipal Government Within County	Contact: PLANNING DIRECTOR PO BOX 1179, SOUTHOLD NY 11971-0959
VILLAGE OF PATCHOGUE GUS Population: 12,447 (2024) ID: 170652	Municipal	Municipal Government Within County	Contact: VILLAGE CLERK PO BOX 719, PATCHOGUE NY 11772-0719
VILLAGE OF BABYLON GUS Population: 12,193 (2024) ID: 190975	Municipal	Municipal Government Within County	Contact: VILLAGE MAYOR 153 W MAIN STREET, 153 W MAIN ST, BABYLON NY 11702
VILLAGE OF LAKE GROVE GUS Population: 11,109 (2024) ID: 131295	Municipal	Municipal Government Within County	Contact: DEPUTY VILLAGE CLERK PO BOX 708, LAKE GROVE NY 11755-0708
VILLAGE OF AMITYVILLE GUS Population: 9,718 (2024) ID: 212076	Municipal	Municipal Government Within County	Contact: VILLAGE ADMINISTRATOR/CLERK 21 IRELAND PL, AMITYVILLE NY 11701-2993
VILLAGE OF PORT JEFFERSON GUS Population: 8,189 (2024) ID: 109579	Municipal	Municipal Government Within County	Contact: ADMINISTRATOR CLERK 121 W BROADWAY, PORT JEFFERSON NY 11777-1397
VILLAGE OF NORTHPORT GUS Population: 7,317 (2024) ID: 170650	Municipal	Municipal Government Within County	Contact: VILLAGE CLERK 224 MAIN ST, NORTHPORT NY 11768-1734
VILLAGE OF SOUTHAMPTON GUS Population: 4,693 (2024) ID: 204976	Municipal	Municipal Government Within County	Contact: VILLAGE ADMINISTRATOR 23 MAIN ST, SOUTHAMPTON NY 11968-4808
VILLAGE OF ISLANDIA GUS Population: 3,651 (2024) ID: 170657	Municipal	Municipal Government Within County	Contact: MAYOR 1100 OLD NICHOLS RD, ISLANDIA NY 11749-4700
VILLAGE OF LLOYD HARBOR GUS Population: 3,565 (2024) ID: 170649	Municipal	Municipal Government Within County	Contact: VILLAGE CLERK/TREASURER 32 MIDDLE HOLLOW RD, HUNTINGTON NY 11743-1698
TOWN OF SHELTER ISLAND GUS Population: 3,316 (2024) ID: 171025	Township	Municipal Government Within County	Contact: SUPERVISOR, TOWN OF SHELTER ISLAND PO BOX 970, SHELTER ISLAND NY 11964-0970
VILLAGE OF BRIGHTWATERS GUS Population: 3,187 (2024) ID: 170645	Municipal	Municipal Government Within County	Contact: VILLAGE CLERK TREAS PO BOX 601, BRIGHTWATERS NY 11718-0601
VILLAGE OF SAG HARBOR GUS Population: 2,816 (2024) ID: 170653	Municipal	Municipal Government Within County	Contact: VILLAGE MAYOR PO BOX 660, SAG HARBOR NY 11963-0015
VILLAGE OF GREENPORT GUS Population: 2,591 (2024) ID: 170646	Municipal	Municipal Government Within County	Contact: VILLAGE CLERK 236 3RD ST, GREENPORT NY 11944-1646
VILLAGE OF WESTHAMPTON BEACH GUS Population: 2,238 (2024) ID: 170656	Municipal	Municipal Government Within County	Contact: VILLAGE MAYOR- ROSEY, SECRETARY VILLAGE OF WESTHAMPTON BEACH, 165 MILL ROAD, WESTHAMPTON BEACH NY 11978-2344
VILLAGE OF BELLPORT GUS Population: 2,211 (2024) ID: 170644	Municipal	Municipal Government Within County	Contact: BILLING DEPT 29 BELLPORT LN, BELLPORT NY 11713-2739
VILLAGE OF BRANCH GUS Population: 1,763 (2024) ID: 170655	Municipal	Municipal Government Within County	Contact: VILLAGE MAYOR PO BOX 725, SMITHTOWN NY 11787-0725
VILLAGE OF QUOGUE GUS Population: 1,697 (2024) ID: 190976	Municipal	Municipal Government Within County	Contact: VILLAGE CLERK TREASURER PO BOX 926, QUOGUE NY 11959-0926
VILLAGE OF NISSEQUOGUE GUS Population: 1,625 (2024) ID: 204975	Municipal	Municipal Government Within County	Contact: VILLAGE CLERK 631 MORICHES RD, SAINT JAMES NY 11780-3601
VILLAGE OF EAST HAMPTON GUS Population: 1,556 (2024) ID: 109575	Municipal	Municipal Government Within County	Contact: VILLAGE ADMINISTRAOTR 86 MAIN ST, EAST HAMPTON NY 11937-2730
VILLAGE OF HEAD OF THE HARBOR GUS Population: 1,475 (2024) ID: 131292	Municipal	Municipal Government Within County	Contact: VILLAGE MAYOR 500 ROUTE 25A, SAINT JAMES NY 11780-1954
VILLAGE OF HUNTINGTON BAY GUS Population: 1,445 (2024) ID: 170647	Municipal	Municipal Government Within County	Contact: VILLAGE ADMINISTRATOR 244 VINEYARD RD, HUNTINGTON NY 11743-1257
VILLAGE OF NORTH HAVEN GUS Population: 1,197 (2024) ID: 109576	Municipal	Municipal Government Within County	Contact: VILLAGE CLERK 335 FERRY RD, SAG HARBOR NY 11963-1027
VILLAGE OF POQUOTT GUS Population: 929 (2024) ID: 109577	Municipal	Municipal Government Within County	Contact: MAYOR 45 BIRCHWOOD AVE, EAST SETAUKET NY 11733-4005
VILLAGE OF OLD FIELD GUS Population: 925 (2024) ID: 131293	Municipal	Municipal Government Within County	Contact: VILLAGE MAYOR PO BOX 2724, SETAUKET NY 11733-0852
VILLAGE OF BELLE TERRE GUS Population: 788 (2024) ID: 170643	Municipal	Municipal Government Within County	Contact: VILLAGE CLERK TREASURER 1 CLIFF RD, PORT JEFFERSON NY 11777-1261
VILLAGE OF SAGAPONACK GUS Population: 744 (2024) ID: 218258	Municipal	Municipal Government Within County	Contact: CLERK-TREASURER PO BOX 600, SAGAPONACK NY 11962-0600
VILLAGE OF ASHAROKEN GUS Population: 608 (2024) ID: 186661	Municipal	Municipal Government Within County	Contact: VILLAGE MAYOR 1 ASHAROKEN AVE, STE 2, NORTHPORT NY 11768-1181
VILLAGE OF SHOREHAM GUS Population: 524 (2024) ID: 109578	Municipal	Municipal Government Within County	Contact: VILLAGE MAYOR PO BOX 389, SHOREHAM NY 11786-0389
VILLAGE OF OCEAN BEACH GUS Population: 175 (2024) ID: 170651	Municipal	Municipal Government Within County	Contact: BUILDING INSPECTOR PO BOX 457, OCEAN BEACH NY 11770-0457
VILLAGE OF WEST HAMPTON DUNES GUS Population: 119 (2024) ID: 131294	Municipal	Municipal Government Within County	Contact: VILLAGE MAYOR PO BOX 728, WESTHAMPTON BEACH NY 11978-0728
VILLAGE OF SALTAIRE GUS Population: 109 (2024) ID: 170654	Municipal	Municipal Government Within County	Contact: VILLAGE MAYOR PO BOX 5551, BAY SHORE NY 11706-0392
VILLAGE OF DERING HARBOR GUS Population: 37 (2024) ID: 131291	Municipal	Municipal Government Within County	Contact: VILLAGE CLERK PO BOX 3010, SHELTER ISLAND HEIGHTS NY 11965-3010