Warren County Post Office

Find Warren County New Jersey 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.


Allamuchy Post Office 16 Old Alamuchy Hackettstown NJ 07840 908-852-1093


Asbury Post Office 285 Asbury-Anderson Road Asbury NJ 08802 908-537-2327

Belvidere Post Office 111 Mansfield Street Belvidere NJ 07823 908-475-2957

Blairstown Post Office 39 Main Street Blairstown NJ 07825 908-362-6249

Broadway Post Office 12 Asbury Bloomsbury Road Asbury NJ 08802 908-689-7775

Changewater Post Office 11 Changewater Road Washington NJ 07882 908-689-2520

Columbia Post Office 27 Decatur Street Columbia NJ 07832 908-496-4191

Delaware Post Office 9 Clinton Street Delaware NJ 07833 908-475-2490

Great Meadows Post Office 4 Regina Lane Independence NJ 07838 908-637-4792

Greenwich Post Office 1016 Ye Greate Street Greenwich NJ 08323 856-455-2555

Hackettstown Post Office 120 Grand Avenue Hackettstown NJ 07840 908-852-3535

Hope Post Office 10 Hope Blairstown Road Blairstown NJ 07825 908-459-4088

Phillipsburg Post Office 361 Memorial Parkway Phillipsburg NJ 08865 908-859-3666

Port Murray Post Office 218 Main Street Mansfield NJ 07865 908-689-2430

Stewartsville Post Office 731 Highway 57 Stewartsville NJ 08886 908-859-1428

Vienna Post Office 7 Water Street Independence NJ 07880 908-637-4691

Washington Post Office 36 Belvidere Avenue Washington NJ 07882 908-689-0443

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.