Marriage license number J means married. Different marriage documents start with different font sizes, and the marriage related documents beginning with font L are divorce certificates; The one starting with the number "BJ" is to reapply for a marriage certificate; The one starting with the number "BL" is the reissued divorce certificate.
The number of the marriage certificate number has different meanings, the form of the marriage certificate number is Jaaaaaa-bbbb-cccccc, where "aaaaaa" is the 6-digit administrative division code (see "Administrative Division Code of the People's Republic of China", GB/T 2260-2002), "bbbb" is the year number. "cccccc" is the serial number of marriage registration in the year, such as Beijing Dongcheng District Civil Affairs Bureau in 2010 for the first couple to go through marriage registration procedures, their marriage registration number is J110101-2010-000001.
The font size of other marriage documents is similar to the font size of the marriage certificate, except that the beginning letter is different. The size of the divorce certificate is LAAAA-BBBB-CCCCCC, the size of the supplementary marriage certificate is BJaaaaaa-bbbb-cccccc, and the size of the supplementary divorce certificate is BLAAAAA-BBBB-CCCCCC.