Multiple Social Security Numbers

From the Denver Post:

More than 20 million Americans have multiple Social Security numbers associated with their names, according to a new study of commercial databases by a leading consumer risk-management firm.

The study by ID Analytics Inc. in San Diego also found that about 100,000 Americans have five or more Social Security numbers tagged to their identity. Most of the associations are innocuous — a mistakenly entered digit or a transposition of two numerals — with little or no intent to defraud the legitimate owner, experts say.