Are there certain prefixes that are not valid Social Security Numbers?

Answer by  km8738 (1917)

Absolutely. I use a computer system that sometimes requires social security numbers to be input. Occasionally when I mistype, I will receive an error message that the number I have input can not possibly be valid (regardless of whether it matches the person or not.)

Answer by  brch2 (6)

The first three digits of an SSN indicate the state in which the number was issued. This number range starts at 001, and currently goes to 772. An SSN that starts with 002, for instance, was issued in New Hampshire (which is covered by the SSN range 001-003).

Answer by  amswplusone (652)

The three-digit prefix indicates what state (or territory) the person was born in. Currently 001 through 728 are either in use or reserved for use, and 729-999 are not used.