Editing Postal code (section)

==== Alphanumeric postal codes ====
Most of the postal code systems are numeric; only a few are alphanumeric (i.e., use both letters and digits). Alphanumeric systems can, given the same number of characters, encode many more locations. For example, while a two digit numeric code can represent 100 locations, a two character alphanumeric code using ten digits and twenty letters can represent 900 locations.

The independent nations using alphanumeric postal code systems are:
* [[Argentina]] ([[Postal codes in Argentina|see table]])
* [[Brunei]] ([[Postal codes in Brunei|see table]])
* [[Canada]] ([[Postal codes in Canada|see table]])
* [[Eswatini]]
* [[Ireland]] ([[Postal addresses in the Republic of Ireland|see table]])
* [[Jamaica]] ([[Postal codes in Jamaica|see table]]) (suspended in 2007<ref>{{cite web |url=http://www.jamaicapost.gov.jm/corporate_news/pressrelease_07.htm |title=Post Code Project Suspended Indefinitely |work=Jamaica Post|date=12 February 2007 |access-date=4 March 2010 |url-status=dead |archive-url=https://web.archive.org/web/20100226125027/http://www.jamaicapost.gov.jm/corporate_news/pressrelease_07.htm |archive-date=26 February 2010 }}</ref>)
* [[Kazakhstan]] (since 2015)
* [[Malta]] ([[Postal codes in Malta|see table]])
* [[Netherlands]] ([[Postal codes in the Netherlands|see table]])
* [[Peru]] ([[List of postal codes in Peru|see table]]), the postal code format in Peru was updated in February 2011 to be of the format of five digits.
* [[Somalia]]
* [[United Kingdom]] ([[Postcodes in the United Kingdom|see table]])

Countries which prefix their postal codes with a fixed group of letters, indicating a country code, include [[Andorra]], [[Azerbaijan]], [[Barbados]], [[Ecuador]] and [[Saint Vincent and the Grenadines]].