Mt. Sinai US Post Office

457 Route 25a
Mt Sinai, NY 11766
Phone: (631) 928-0394
Fax: (516) 747-5876
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East Marion US Post Office

9165 Main Road
East Marion - 11939
(631) 477-1668

Sayville US Post Office

130 Greene Avenue
Sayville - 11782
(631) 589-6963

Baldwin US Post Office

2260 Grand Avenue
Baldwin - 11510
(516) 223-5024

Northport US Post Office

240 Main St
Northport - 11768
(631) 261-6941

Copiague US Post Office

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

Southold US Post Office

710 Traveler St
Southold - 11971
(631) 765-4027

Mastic US Post Office

1450 Montauk Highway
Mastic - 11950
(631) 281-0275

Wheatley Heights US Post Office

6 Colonial Springs Road
Wheatley Heights - 11798
(631) 643-3913

Bethpage US Post Office

339 Hicksville Road
Bethpage - 11714
(516) 938-3901

Elmont US Post Office

778 Elmont Road
Elmont - 11003
(516) 285-4078