United States Postal Service 65 Hazlet Ave, Hazlet, NJ07730 The United States Post Office is a local post office in Hazlet. It has many P.O. Boxes for rental, and…More customers can even rent them online at www.usps.com. The post office has many options to send and track your mail. It sells packaging materials so you make a package in the lobby if necessary. It also runs the special "if it fits, then it ships," which offers one-rate shipping for those boxes.