As This Seems to Be a Common Question, I Thought That a Blog Post on the Subject Might Be Appropriate….What Do the Letters After a Social Security or Medicare Number Mean?

Social Security and Medicare numbers are composed of nine digits. The first three digits are the state in which the number was issued, the next four digits are the county in which the number was issued, and the last three digits are the number’s sequential number within that state.

For example, a Social Security number for a person born in California would have a six-digit number, starting with 968. The first two digits would be 9, for California, the next three would be 8 for San Bernardino County, and so on.

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