Here is some trivia about social security numbers. The first three numbers are an area number. Area numbers are assigned to each state, starting on the east coast and moving west.
The middle 2 numbers are the group number. Group numbers are assigned in specific odd and even number sequences determined by when and where your application was processed. The final four numbers are your serial number.
Social security numbers are never re-assigned. Over 415 million have been issued.
The lowest number, 001-01-0001, was assigned to Grace Owen of New Hampshire in 1936.