noun
resident registration code
An 11-digit personal identification number assigned to each resident in Japan's Basic Resident Register system. Used for administrative procedures such as moving, passport applications, and obtaining copies of residence certificates.
住民票コードは、市区町村から通知されます。
Your resident registration code will be notified by your municipality.
転入届を出すときに住民票コードが必要です。
You need your resident registration code when submitting a moving-in notification.
住民票 is the certificate of residence itself, while 住民票コード is the identification code linked to that record.
Compound of 住民票 (resident registration) + コード (code). The term was introduced with the revision of the Basic Resident Registration Act in 2002.