See What State Everyone Is Born in Based on Their Social Security Number
Briefly

Social Security numbers (SSNs) were initially created in 1936 to track accounts by the Social Security Administration, yet have evolved into a primary form of identification used across various sectors including employment, healthcare, and education.
From 1973 until June 2011, the area number of a Social Security number was assigned based on the ZIP Code provided in the application, allowing some inference about a person's birthplace from their SSN.
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