Great River Post Office

62 River Rd, Great River, NY 11739

Contact Numbers:

Phone: 631-581-7680
Fax: 631-224-1375
TTY: 877-889-2457
Toll-Free: 1-800-Ask-USPS® (275-8777)

Retail Hours

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

Pickup Services Hours

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

PO Box Access Hours

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

PO Box Delivery Time

Monday-Saturday 11:00am
Sunday Closed

Last Collection Times

Monday-Friday 4:30pm
Saturday 12:45pm
Sunday Closed

Global Express Guaranteed® Hours

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

*This facility does not process US Passports applications or renewals. Check nearby locations below.

  • Bulk Mail Acceptance
  • Bulk Mail Account Balance
  • Bulk Mail New Permit
  • Business Reply Mail Account Balance
  • Business Reply Mail New Permit
  • Duck Stamps
  • General Delivery
  • Global Express Guaranteed®
  • Money Orders (Domestic)
  • Money Orders (Inquiry)
  • Money Orders (International)
  • Packaged Stamps
  • Pickup Accountable Mail
  • Pickup Hold Mail
  • PO Box Online
  • Priority Mail International®

Visit our Links Page for Change of Address, Hold Mail/Stop Delivery, PO Boxes™ rentals and fees, Rates on Postage Stamps and Freight/Shipping, Holidays, Bulk Mail, Money Orders, and Available Jobs.

*Please call to verify information. Is anything incorrect? Let us know here

Nearby Post Offices:

East Islip
11 Greenwood Ave
1.4 miles away

Oakdale
927 Montauk Hwy
1.6 miles away

Islip Terrace
136 Carleton Ave
1.9 miles away

Federal Court House
101 Federal Plz
2.2 miles away

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