social security numbers

The social security number assigned residents of the United States has the form XXX-XX-XXXX, or Area-Group-Serial.

The Serial number is not necessarily assigned in serial order and not much can be learned from it.

The Group number is used only as a check on whether a number has been assigned already; each month the Social Security Administration publishes a list of the highest Group number yet assigned for each Area number. The Group numbers are not assigned serially. Odd numbers under 10 are assigned first, then even numbers over 9, then even numbers under 9 (except 00, which is never assigned), and finally odd numbers over 10.

The first three digits in a social security number, the Area number, is meaningful. As a general rule, in numbers assigned before 1972 the Area number identifies the place where the number was issued. For cards issued after 1972, it indicates the place where the applicant resided at the time he or she applied for the number.

Area number Location
000 will never be used
001-003 New Hampshire
004-007 Maine
008-009 Vermont
010-034 Massachusetts
035-039 Rhode Island
040-049 Connecticut
050-134 New York
135-158 New Jersey
159-211 Pennsylvania
212-220 Maryland
221-222 Delaware
223-231 Virginia
232 West Virginia, North Carolina
233-236 West Virginia
237-246 North Carolina
247-251 South Carolina
252-260 Georgia
261-267 Florida
268-302 Ohio
303-317 Indiana
318-361 Illinois
362-386 Michigan
387-399 Wisconsin
400-407 Kentucky
408-415 Tennessee
416-424 Alabama
425-428 Mississippi
429-432 Arkansas
433-439 Louisiana
440-448 Oklahoma
449-467 Texas
468-477 Minnesota
478-485 Iowa
486-500 Missouri
501-502 North Dakota
503-504 South Dakota
505-508 Nebraska
509-515 Kansas
516-517 Montana
518-519 Idaho
520 Wyoming
521-524 Colorado
525 New Mexico
526-527 Arizona
528-529 Utah
530 Nevada
531-539 Washington
540-544 Oregon
545-573 California
574 Alaska
575-576 Hawaii
577-579 District of Columbia
580 Virgin Islands, Puerto Rico
581-584 Puerto Rico
585 New Mexico
586 Pacific Islands.
SE Asia refugees, Apr 1975-Nov 1979
587-588 Mississippi
589-595 Florida
596-599 Puerto Rico
600-601 Arizona
602-626 California
627-645 Texas
646-647 Utah
648-649 New Mexico
650-653 Colorado
654-658 South Carolina
659-665 Louisiana
666 unassigned
667-675 Georgia
676-679 Arkansas
680 Nevada
681-690 North Carolina
691-699 Virginia
700-728 Railroad workers, discontinued 1 July 1963
729-733 Enumeration at entry
733-749 unassigned
750-751 Hawaii
752-755 Mississippi
756-763 Tennessee
764-765 Arizona
766-772 Florida
773-899 unassigned, for future use
900-999 not valid SSNs, but were used in programs when state aid to the aged, blind and disabled was converted to a federal program administered by SSA.
home| society index| search| to contact Sizes drawing of envelope| acknowledgements| help|

privacy

terms of use