List of US Post Office Stores in Nantucket, MA Outlet Note Regular Brands US Post Office Massachusetts Nantucket Rating 4.5 based on 76 votes Official Website https://www.usps.com/ Products Postal Service NameAddressPhone Name/Address/Phone US Post Office outlet - Nantucket 144 Pleasant St (508) 228-4477 US Post Office outlet - Nantucket 5 Federal St (508) 228-4477 US Post Office outlet - Nantucket 155 Old South Rd (508) 325-5987 People Also Viewed