Union County Post Office

Find Union 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.


Bayway Post Office 544 Bayway Elizabeth NJ 07202 908-351-0983


Berkeley Heights Post Office 364 Springfield Avenue Berkeley Heights NJ 07922 908-464-1115

Clark Post Office 1087 Raritan Road Clark NJ 07066 732-381-0261

Cranford Post Office 3 Miln Street Cranford NJ 07016 908-276-3506

Elizabeth Post Office 310 North Broad Street Elizabeth NJ 07208 908-820-8540

Elmora Post Office 175 Elmora Avenue Elizabeth NJ 07202 908-354-5697

Fanwood Post Office 275 South Avenue Fanwood NJ 07023 908-322-7978

Garwood Post Office 202 Center Street Garwood NJ 07027 908-789-0315

Grasselli Post Office 938 South Wood Avenue Linden NJ 07036 908-862-3984

Hillside Post Office 1146 Liberty Avenue Hillside NJ 07205 908-527-0648

Industrial Hillside Post Office 397 Hillside Avenue Hillside NJ 07205 973-926-1240

Jobstown Post Office 2206 Saylors Pond Road Springfield NJ 08041 609-723-2586

Juliustown Post Office 393 Main Street Springfield NJ 08042 609-894-4648

Kenilworth Post Office 641 Kenilworth Boulevard Kenilworth NJ 07033 908-241-9823

Linden Post Office 400 Wood Avenue Linden NJ 07036 908-925-8836

Mountainside Post Office 604 Sherwood Parkway Mountainside NJ 07092 908-233-0148

Muhlenberg Post Office 1080 Arlington Avenue Plainfield NJ 07060 908-753-1480

Netherwood Post Office 1120 North Avenue Plainfield NJ 07062 908-753-0445

New Providence Post Office 598 Central Avenue New Providence NJ 07974 908-665-2075

North Elizabeth Post Office 772 Newark Avenue Elizabeth NJ 07208 908-355-0176

What is a Post Office?

A post office is a local branch of the United States Postal Service, where mail is received and dispatched to individuals and businesses in a given community. A post office usually has postal clerks who receive and process mail, and it's also the place from which mail carriers pick up mail they deliver on their local routes. The office handles USPS business, including mail and package sorting, delivery and forwarding, sales of stamps and other postal supplies, change-of-address requests, and other administrative functions.

In some small communities, the local post office may be located within a commercial business. In communities both large and small, a post office may serve as a local passport office at which passport applications are received and undergo initial processing.