Jefferson County Post Office

Find Jefferson County New York 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.


Adams Center Post Office 13346 North Street Adams Center NY 13606 315-583-5811


Adams Post Office 27 East Church Street Adams NY 13605 315-232-2312

Alexandria Bay Post Office 15 Bethune Street Alexandria Bay NY 13607 315-482-9521

Antwerp Post Office 50 Main Street Antwerp NY 13608 315-659-8651

Belleville Post Office 8279 Route 289 Adams NY 13605 315-846-5000

Black River Post Office 28553 Highway 3 Black River NY 13612 315-773-5000

Brownville Post Office 118 Brown Boulevard Watertown NY 13601 315-788-3390

Calcium Post Office 24841 County Road 138 Calcium NY 13616 315-788-1881

Cape Vincent Post Office 362 Broadway Street Cape Vincent NY 13618 315-654-2424

Carthage Post Office 521 State Street Carthage NY 13619 315-493-3600

Chaumont Post Office 12061 Route 12E Chaumont NY 13622 315-649-5225

Clayton Post Office 236 John Street Clayton NY 13624 315-686-3311

Deferiet Post Office 43 Anderson Avenue Carthage NY 13619 315-493-0363

Depauville Post Office 32523 New York 12 Chaumont NY 13622 315-686-3040

Dexter Post Office 612 Brown Street Dexter NY 13634 315-639-6946

Ellisburg Post Office 12109 Highway 193 Ellisburg NY 13636 315-846-5511

Evans Mills Post Office 8496 Leray Street Evans Mills NY 13637 315-629-4820

Felts Mills Post Office 24456 Main Street Felts Mills NY 13638 315-773-4435

Fineview Post Office 44392 County Rte 191 NY 13640 315-482-3700

Fishers Landing Post Office 18064 Reed Point Road Clayton NY 13624 315-686-5008

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.