A postal code is a series of letters and/or digits which is useful to identify the a particular region within a postal address. Once postal codes were introduced, other applications became possible.
A postal code is a series of letters and/or digits which is useful to identify the a particular region within a postal address. Once postal codes were introduced, other applications became possible.
In February 2005, 117 of the 190 member countries of the Universal Postal Union had postal code systems. Countries that do not have national systems include Ireland and Panama. Although Hong Kong and Macau are now Special Administrative Regions of China, each maintains its own long-established postal system, which does not utilize postal codes for domestic mail, and no postal codes are assigned to Hong Kong and Macau. Mail between Hong Kong, Macau and mainland China is treated as international.
