Islip US Post Office

309 Main St # 3
Islip, NY 11751
Phone: (631) 581-7931
Fax: (516) 487-2508
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Brookhaven US Post Office

2512 Montauk Highway
Brookhaven - 11719
(631) 286-1591

Copiague US Post Office

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

Montauk US Post Office

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

Mt. Sinai US Post Office

457 Route 25a
Mt Sinai - 11766
(631) 928-0394

New Hyde Park US Post Office

1568 Union Turnpike
New Hyde Park - 11040
(516) 616-6893

Peconic US Post Office

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

Ridge US Post Office

1700 Middle Country Road
Ridge - 11961
(631) 345-6842

Sagaponack US Post Office

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

St. James US Post Office

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

West Hempstead US Post Office

245 Hempstead Avenue
West Hempstead - 11552
(516) 481-5430