Editing National identification number (section)

=== Republic of China (Taiwan) ===
In Taiwan, an [[Republic of China National Identification Card|ID card]] is mandatory for all citizens who are over 14&nbsp;years old. Every citizen has a unique ID number. The ID card has been uniformly numbered since 1965. A valid National Identification number consists of one letter and nine-digits, in the format A########C. The letter ("A") records the card holder's first [[Administrative divisions of the Republic of China|location]] of household registration, which is usually where they were born. The first digit depends on [[gender]]; 1 for male, 2 for female. The last digit ("C") is a [[checksum]]. Thus the total number of IDs is 208,000,000.<ref name="jidanni">{{cite web |url=http://jidanni.org/comp/checksums/taiwanidchecksum |title=Compute Taiwan citizen and resident identification number checksums |publisher=Jidanni.org |access-date=2014-03-09 |archive-date=2013-10-29 |archive-url=https://web.archive.org/web/20131029202938/http://jidanni.org/comp/checksums/taiwanidchecksum |url-status=live }}</ref>

The letter usage (i.e., indicating the household registration location) is as follows:

{|style="text-align:center;"
|-
| colspan="2" style="width:350px;"|Active letters||Letters no longer issued
|-
|valign=top|
{|class=wikitable style="text-align:center;"
|-
! Letter !! City/county
|-
| A || [[Taipei City]]
|-
| B || [[Taichung City]]
|-
| C || [[Keelung City]]
|-
| D || [[Tainan City]]
|-
| E || [[Kaohsiung City]]
|-
| F || [[New Taipei City]]
|-
| G || [[Yilan County, Taiwan|Yilan County]]
|-
| H || [[Taoyuan City]]
|-
| I || [[Chiayi City]]
|-
| J || [[Hsinchu City]]
|-
| K || [[Miaoli County]]
|}
|valign=top|
{|class=wikitable style="text-align:center;"
|-
! Letter !! City/county
|-
| M || [[Nantou County]]
|-
| N || [[Changhua County]]
|-
| O || [[Hsinchu County]]
|-
| P || [[Yunlin County]]
|-
| Q || [[Chiayi County]]
|-
| T || [[Pingtung County]]
|-
| U || [[Hualien County]]
|-
| V || [[Taitung County]]
|-
| W || [[Kinmen|Kinmen County]]
|-
| X || [[Penghu|Penghu County]]
|-
| Z || [[Matsu Islands|Lienchiang County]]
|}
|valign=top|
{|class=wikitable style="text-align:center;"
|-
! Letter !! Original division !! Date of final issue !! Current division
|-
| L || [[Taichung County]] || 25 Dec. 2010 || [[Taichung City]]
|-
| R || [[Tainan County]] || 25 Dec. 2010 || [[Tainan City]]
|-
| S || [[Kaohsiung County]] || 25 Dec. 2010 || [[Kaohsiung City]]
|-
| Y || Yangmingshan Management Bureau || 1975 || [[Taipei City]]
|}
|}