List of US Post Office Stores in New Gretna, NJ Outlet Note Regular Brands US Post Office New Jersey New Gretna Rating 4.5 based on 76 votes Official Website https://www.usps.com/ Products Postal Service NameAddressPhone Name/Address/Phone US Post Office outlet - New Gretna 5624 Route 9 (609) 296-5005 People Also Viewed