In the United States, the birth certificate number is located in the upper right hand corner of the certificate. The location of the number can vary depending on the state that issued the certificate, but most today use a set of eleven numbers that is separated by spaces.
If the birth certificate number isn't located in the upper right hand corner, look for an eleven-digit number or a combination of two letters followed by numbers. This is the birth certificate number. Contacting the local Department of Vital Records is the best way to determine a birth certificate number if the original copy of the certificate isn't available or if the number can't be identified. The Department of Vital Records maintains a record of all birth certificate numbers issued in the state. Be prepared to show identification when seeking help in locating the birth certificate number at the Department of Vital Statistics.