In the US, we have ZIP+4, which appends an additional four digits to the five-digit ZIP code. It's mainly used by bulk mailers, as part of qualifying for reduced postage rates.
Like the British postcode, important addresses have their own ZIP+4. E.g., 20500-0001, 20500-0002, and 20500-0003 refer, respectively, to the President, the First Lady, and the White House in general.
Like the British postcode, important addresses have their own ZIP+4. E.g., 20500-0001, 20500-0002, and 20500-0003 refer, respectively, to the President, the First Lady, and the White House in general.