XHow To Use This SiteX First Time User Returning Clients Client Agreement	Structure of Social Security Numbers 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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