GREAT RIVER POST OFFICE 11739

Great River Post Office Hours


Retail Hours

Contact Numbers:

Phone: 631-581-7680
Monday-Friday 9:00am - 5:00pm
Saturday 9:00am - 1:00pm
Sunday Closed

Bulk Mail Acceptance Hours

Monday-Friday 9:00am - 4:00pm
Saturday-Sunday Closed

Monday-Friday 9:00am - 5:00pm
Saturday 9:00am - 1:00pm
Sunday Closed

Lobby Hours

Monday-Friday 6:00am - 6:00pm
Saturday 6:00am - 1:00pm
Sunday Closed

USPS Shipping Rate Calculator

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Catherine M Southard (Postmaster) catherine.m.southard@usps.gov
62 River Rd
Great River, NY 11739

The Great River Post Office is located in the state of New York within Suffolk County. This location serves 1,223 Great River residents with a median income of $222,321. It's estimated that approximately 1,952 packages pass through this post office each year.

Great River Post Office Location


Great River New York Local Links