Long Beach US Post Office

101 E Park Avenue
Long Beach, NY 11561
Phone: (516) 432-5484
Fax: (631) 226-5599
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Sagaponack US Post Office

542 Sagg Main St
Sagaponack - 11962
(631) 537-9346

Mastic Beach US Post Office

110 Mastic Road
Mastic Beach - 11951
(631) 281-0359

Islip US Post Office

309 Main St # 3
Islip - 11751
(631) 581-7931

Massapequa Park US Post Office

4910 Merrick Road
Massapequa Park - 11762
(516) 798-1268

St. James US Post Office

325 Lake Avenue
St James - 11780
(631) 584-4138

Sound Beach US Post Office

25 New York Avenue
Sound Beach - 11789
(631) 744-0837

Southold US Post Office

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

Bay Shore US Post Office

10 Bay Shore Avenue
Bay Shore - 11706
(631) 969-3506

Westhampton US Post Office

408 Mill Road
Westhampton - 11977
(631) 288-4081

Fishers Island US Post Office

1 Oriental Avenue
Fishers Island - 06390
(631) 788-7835