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Area numbers - The first three numbers originally represented the state in which a person first applied for a Social Security card.

Group numbers - These two middle digits, which range from 01 through 99, are simply used to break all the SSNs with the same area number into smaller blocks, which makes administration easier.

Serial numbers - Within each group designation, serial numbers -- the last four digits in an SSN -- run consecutively from 0001 through 9999.

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