Mt. Sinai US Post Office

457 Route 25a
Mt Sinai, NY 11766
Phone: (631) 928-0394
Fax: (516) 747-5876
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Community Offices / Post Offices

Post Offices

Bayville US Post Office

251 Bayville Avenue
Bayville - 11709
(516) 628-9235
Post Offices

Centereach US Post Office

245 Centereach Mall
Centereach - 11720
(631) 588-7069
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Central Islip US Post Office

101 Federal Plaza
Central Islip - 11722
(631) 715-0001
Post Offices

Copiague US Post Office

695 Marconi Blvd
Copiague - 11726
(631) 842-9084
Post Offices

Greenvale US Post Office

37 Northern Blvd
Greenvale - 11548
(516) 621-7163
Post Offices

Melville US Post Office

718 Walt Whitman Road
Melville - 11747
(631) 421-0726
Post Offices

Montauk US Post Office

73 S Euclid Avenue
Montauk - 11954
(631) 668-7043
Post Offices

Oakdale US Post Office

927 Montauk Highway
Oakdale - 11769
(631) 589-2683
Post Offices

Port Jefferson US Post Office

407 E Main St # 17
Port Jefferson - 11777
(631) 473-1065
Post Offices

West Islip US Post Office

480 Union Blvd
West Islip - 11795
(631) 669-5157
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