Northport Post Office, the U.S. post office in Northport, New York, is located at 244 Main Street in Northport, New York. It serves the ZIP code 11768, which also includes Asharoken, Eaton's Neck, Vernon Valley, Middleville, and Fort Salonga.Northport Post Office was designed by Louis A. Simon in conjunction with the United States Treasury Department. Simon also designed the Post Office buildings in Bay Shore, Riverhead, and Westhampton Beach. The building was added to the National Register of Historic Places in 1989, along with two other Simon-built post offices.
