A social security number is given to a person when he or she wishes to begin employment within the United States. Even temporary workers on visas are sometimes required to obtain a social security card in order to work. Social security numbers (SSNs) are completely individual and can become a key piece of information when trying to search for a missing loved one or long lost relative.

Each SSN is made up of nine digits split into a three fields of three, two, and four numbers. The first three numbers make up the "area number," and correspond to specific states where the SSN was initially issued. The two middle numbers create the "group number" to create a chronological record of issue, while the last four numbers (the "serial number") provide a chronological assignment within the area and group numbers.

It is thus possible to use these numbers to find the current location of a person who stepped out of your life a long time ago. Unless this individual has changed his identity through a witness protection program, his social security number will stay consistent throughout his life. This method is also the most accurate way to track down someone and does not require any new names, addresses or dates of birth to use.

Why Find a Person by Social Security Number?

Most businesses choose to find individuals by SSN to protect themselves from fraudulent claims and identity theft. People often go by SSN to find deadbeat parents, bond jumpers, debtors, possible witnesses, and other individuals who may decide to fake everything else but their security number. Plus, married names and addresses change over the years; social security numbers stay with people for the rest of their lives.