Postal Codes
United States
USPS postal codes (ZIP codes) are 5 digits long (zero-padded).
ZIP+4 is an extension of the standard postal code system, involving an additional (trailing with hyphen delimiter) postal code that is 4 digits long (zero-padded).
For more details, see here.
United Kingdom
For more details, see here.
Canada
For more details, see here.
Germany
German postal codes are 5 digits long (zero-padded). The leading digit indicates a region, though these regions do not follow other political boundaries.
For more details, see here.
Japan
For more details, see here.
South Korea
For more details, see here.
