11720 Post Office

Find 11720 post offices and USPS mailing boxes. Post offices provide information on bulk mail services, domestic mail delivery, international shipping, change of address, mail forwarding, PO boxes, and passport services.


Centereach Post Office 245 Centereach Mall Centereach NY 11720 631-588-7069


Lake Grove Post Office 1001 Hawkins Avenue Lake Grove NY 11755 2.1 miles from 11720 631-588-7019

Selden Post Office 109 College Road Selden NY 11784 2.2 miles from 11720 631-732-8627

Lake Ronkonkoma Post Office 300 Portion Road Ronkonkoma NY 11779 3.1 miles from 11720 631-588-1292

Niagara University Post Office 1 Sophomore Lane Stony Brook NY 11790 3.3 miles from 11720 716-285-2655

Farmingville Post Office 500 Horseblock Road Farmingville NY 11738 3.3 miles from 11720 631-732-8625

Coram Post Office 117 Pauls Path Coram NY 11727 3.7 miles from 11720 631-732-8691

Saint James Post Office 325 Lake Avenue St. James NY 11780 3.9 miles from 11720 631-584-4138

Ronkonkoma Post Office 200 Hawkins Avenue Ronkonkoma NY 11779 4.1 miles from 11720 631-588-0301

Holbrook Post Office 445 Furrows Road Holbrook NY 11741 4.3 miles from 11720 631-588-0226

Nesconset Post Office 226 Smithtown Boulevard Nesconset NY 11767 4.3 miles from 11720 631-265-3278

Port Jefferson Station Post Office 544 Jefferson Boulevard Port Jefferson Station NY 11776 4.3 miles from 11720 631-473-2751

Holtsville Post Office 162 Long Island Avenue Holtsville NY 11742 4.4 miles from 11720 631-475-1761

East Setauket Post Office 450 Route 25A Setauket-East Setauket NY 11733 4.7 miles from 11720 631-941-4005

Stony Brook Post Office 129 Main Street Stony Brook NY 11790 4.7 miles from 11720 631-751-5691

Port Jefferson Post Office 407 East Main Street Port Jefferson NY 11777 5.2 miles from 11720 631-473-1065

Setauket Post Office 101 Main Street Setauket-East Setauket NY 11733 5.4 miles from 11720 631-941-4042

Mount Sinai Post Office 457 Route 25A Mount Sinai NY 11766 5.5 miles from 11720 631-928-0394

Smithtown Post Office 25 Route 111 Smithtown NY 11787 5.6 miles from 11720 631-360-6709

Medford Post Office 1905 Route 112 Medford NY 11763 6.1 miles from 11720 631-475-8273

About Post Offices

What Change of Address options are available?

Customers can request a temporary or permanent Change of Address either online or in person at the Post Office using PS Form 3575. The online application for Change of Address has a $1.00 identity validation fee.

Is it possible to insure mail and items sent via the USPS?

Yes. Standard mail can be insured for up to $5,000 for an additional fee. Registered mail items can be insured for up to $50,000.

What is the USPS Office of Inspector General?

The Office of Inspector General (OIG) is a division within the USPS responsible for ensuring the integrity and accountability of the postal service. It conducts investigations to safeguard the postal system and performs audits and reviews.