Taiwan
In Taiwan, an ID card is mandatory for all citizens who are over 14 years old. The ID card has been uniformly numbered since 1965. The current ID number has 10 digits in the format AG#######C. The first digit is one capital English letter and is followed by nine Arabic numerals. The letter records the card holder's first location of household registration, which is usually where s/he was born. The letter indicates one of the following areas:
Every citizen has a unique ID number. A valid National Identification number consists of one letter and nine-digits. The initial letter depends on the place of one's first household registration. The first digit depends on gender; 1 for male, 2 for female. The last digit is a checksum. Thus the total number of IDs is 208,000,000.
The letter usage is as follows:
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Read more about this topic: National Identification Number