Middlesex County Post Office

Find Middlesex 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.


Avenel Post Office 1065 Rahway Avenue Woodbridge NJ 07001 732-634-4703


Brainy Boro Post Office 195 Central Avenue Metuchen NJ 08840 732-549-8623

Carteret Post Office 212 Pershing Avenue Carteret NJ 07008 732-541-8397

Colonia Post Office 574 Inman Avenue Woodbridge NJ 07067 732-388-3760

Cranbury Post Office 65 North Main Street Cranbury NJ 08512 609-395-0748

Dayton Post Office 347 Georges Road South Brunswick NJ 08810 732-329-6296

Dunellen Post Office 311 North Avenue Dunellen NJ 08812 732-968-2070

East Brunswick Post Office 614 Cranbury Road East Brunswick NJ 08816 732-257-6270

Edison Post Office 2101 Route 27 Edison NJ 08817 732-287-4311

Ernston Post Office 499 Ernston Road Sayreville NJ 08859 732-727-5220

Fords Post Office 450 New Brunswick Avenue Woodbridge NJ 08863 732-738-1036

Handy Street Post Office 333 Handy Street New Brunswick NJ 08901 732-545-8148

Helmetta Post Office 68 Main Street Helmetta NJ 08828 732-521-0326

Highland Park Post Office 406 Raritan Avenue Highland Park NJ 08904 732-572-6006

Iselin Retail Station Post Office 240 Middlesex Tpke Iselin NJ 08830 732-283-0053

Jamesburg Post Office 13 East Railroad Avenue Jamesburg NJ 08831 732-521-0403

Keasbey Post Office 140 Smith Street Woodbridge NJ 08832 732-738-4444

Kilmer Retail Post Office 21 Kilmer Road Edison NJ 08817 732-819-3263

Kilmer Station Post Office 21 Kilmer Road Edison NJ 08817 732-819-4308

Laurence Harbor Post Office 902 Route 35 North South Amboy NJ 08879 732-566-7031

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.