SSN Finder: Structure of Social Security Numbers

Posted by admin on July 16th, 2010

A Social Security Number (SSN) consists of nine digits. The first three digits is called the “area number’. The central, two-digit field is called the “group Number”. The final four-digit field is called the “serial Number”.

Area Numbers
The area numbers are assigned to geographic locations. They were originally assigned the same way that zip codes were later assigned. Most area numbers were assigned according to State boundaries, although the series 700-729, was assigned to railroad workers, regardless of location. In many regions the original range of area number assignments was eventually exhausted as population grew.

State Area Number State Area Number
Alabama 416-424 Mississippi 425-428
587-588
Alaska 574 Missouri 486-500
Arizona 526-527
600-601		 Montana 516-517
Arkansas 429-432 Nebraska 505-508
California 545-573
602-626		 Nevada 530
Colorado 521-524 New Hampshire 001-003
Connecticut 040-049 New Jersey 135-158
Delaware 221-222 New Mexico 525,585
648-649
Dist Of Columbia 577-579 New York 050-134
Florida 261-267
589-595		 North Carolina 237-246
Georgia 252-260 North Dakota 501-502
Hawaii 575-576 Ohio 268-302
Idaho 518-519 Oklahoma 440-448
Illinois 318-361 Oregon 540-544
Indiana 303-317 Pennsylvania 159-211
Iowa 478-485 Rhode Island 035-039
Kansas 509-515 South Carolina 247-251
Kentucky 400-407 South Dakota 503-504
Louisiana 433-439 Tennessee 408-415
Maine 004-007 Texas 449-467
627-645
Maryland 212-220 Utah 528-529
646-647
Massachusetts 010-034 Vermont 008-009
Michigan 362-386 Virginia 223-231
Minnesota 468-477 Washington 531-539
    West Virginia 232-236
    Wisconsin 387-399
    Wyoming 520
       
650-699 Unassigned, for future use.
700-728 Railroad workers through 1963, then discontinued
729-799 Unassigned, for future use.
800-999 Not valid SSN’s

Group Numbers
The group number is not related to geography, but rather to the order in which SSN’s are issued for a particular area.

Serial Numbers
Serial numbers are assigned in chronological order within each area & group number, as the applications.

Invalid SSNs
Any SSN conforming to one of the following criteria, is an invalid number:
1. Any field, all zeroes
2. First three digits above 740
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