In the United States, a Social Security number (SSN) is a nine-digit number issued to U.S. citizens, permanent residents, and temporary (working) residents under section 205(c)(2) of the Social Security Act, codified as 42 U.S.C. ยง 405(c)(2)
| Type | datatype | |
| Is personal identifiable information (PII) ? | True | |
| Regular expression | ([0-9]{3})[- .]([0-9]{2})[- .]([0-9]{4}) | |
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| Classification | Classification | identifier |
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