The first six digits of Guangzhou ID number are 440100, and the ID number format is :440100abcdef ghijkl, and the length is 18 digits. The first 17 digits are all numbers, and the 18th digit is mostly numbers, and a few people are letters &”;X&”;. Among them, 440100 is the area code of Guangzhou (the administrative district code where the household registration is located); The first six digits of ABCD Guangzhou ID number are 440100, the ID number format is :440100ABCD ef ghijkl, and the length is 18 digits. The first 17 digits are all numbers, and the 18th digit is mostly numbers, and a few people are letters &”;X&”;.