Legal analysis: the account number is the code of the account location, which refers to the administrative division code of the party's household registration location. The parties can know by looking at the first six digits (address code) of the ID card.

Legal basis: Article 3 of the Law of the People's Republic of China on Resident Identity Cards includes: name, gender, nationality, date of birth, location of permanent residence, citizenship number, personal photo, fingerprint information, validity period of certificate and issuing authority. Citizenship number is a unique and life-long identity code for every citizen, which is compiled by public security organs according to the national standard of citizenship number. Citizens applying for obtaining, renewing or replacing resident identity cards shall register their fingerprint information.