St. James US Post Office

325 Lake Avenue
St James, NY 11780
Phone: (631) 584-4138
Fax: (631) 360-0532
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Port Jefferson US Post Office

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

Peconic US Post Office

2575 Peconic Ln
Peconic - 11958
(631) 765-9348

Merrick US Post Office

2040 Merrick Road
Merrick - 11566
(516) 378-7087

Islandia US Post Office

PO Box 7800
Islandia - 11760
(631) 582-7420

Shelter Island Heights US Post Office

6 Grand Avenue
Shelter Island Heights - 11965
(631) 749-0486

West Sayville US Post Office

12 Washington Avenue
West Sayville - 11796
(631) 589-6958

Old Bethpage US Post Office

696 Old Bethpage Road
Old Bethpage - 11804
(516) 249-2915

Brightwaters US Post Office

145 Orinoco Dr
Brightwaters - 11718
(631) 206-4855

Port Jefferson Station US Post Office

544 Jefferson Placeaza
Port Jefferson Station - 11776
(631) 473-2751

Hampton US Post Office

16 Ponquogue Avenue
Hampton Bays - 11946
(631) 728-6994