Since 1948, most State registrars use a uniform numbering system.
Birth certificates (BCs) issued by the States generally include an 11-digit number
in a xxx xx xxxxxx format. The number begins with a 3-digit birth area code number
followed by a 2-digit year of registration (almost always the year of birth) and lastly
a 6-digit serial registration number (assigned sequentially to each birth as it is