Great River US Post Office

62 River Road
Great River, NY 11739
Phone: (631) 581-7680
Fax: (516) 487-2508
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Massapequa US Post Office

80 Atlantic Avenue
Oceanside - 11572
(516) 766-5829

Hicksville US Post Office

185 W John St
Hicksville - 11801
(516) 933-2300

Farmingdale US Post Office

380 Main St
Farmingdale - 11735
(516) 249-1552

East Marion US Post Office

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

Islandia US Post Office

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

Middle Island US Post Office

780 Middle Country Road
Middle Island - 11953
(631) 205-1089

Aquebogue US Post Office

212 Linda Avenue
Aquebogue - 11931
(631) 722-4368

Nesconset US Post Office

226 Smithtown Blvd
Nesconset - 11767
(631) 265-3278

Oakdale US Post Office

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

Smithtown US Post Office

25 Route 111
Smithtown - 11787
(631) 360-6709