What Are the Random Last 4 Digits of a Social Security Number?

By Staff WriterLast Updated Apr 1, 2020 2:26:35 PM ET
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The last four digits of a Social Security number are called the serial number. The numbers that can be used as the last four numbers of a Social Security number run consecutively from 0001 to 9999 and are issued in accurate sequence depending on when the Social Security number request is received.