The first three digits of a person's Social Security number can often help you to determine where your ancestor may have possibly been living when his/her SSN was issued (see exceptions below). These numbers can also be helpful in determining which listings in the SSDI may belong to your ancestor.
The first three digits of a person's Social Security number were, prior to 1973, determined by the state where the person applied fo their social security card. Since that time, the first three digits have been assigned based on the ZIP Code of the mailing address on the Social Security number application.
The chart below shows the first 3 digits of the social security numbers assigned throughout the United States and its possessions.
The state of issuance (this is not necessarily the state of residence at the time of issuance) can be verified by looking at the Social Security number itself. The next two digits of the number are a code used to track fraudulent numbers. The last four digits are randomly assigned.
SOCIAL SECURITY NUMBER STATE CODES
| 574 (AK) | 416-424 (AL) | 429-432 (AR) |
| 526-527 (AZ) | 545-573 (CA) | 521-524 (CO) |
| 040-049 (CT) | 577-579 (DC) | 221-222 (DE) |
| 261-267 (FL) | 252-260 (GA) | 575-576 (HI) |
| 478-485 (IA) | 518-519 (ID) | 318-361 (IL) |
| 303-317 (IN) | 509-515 (KS) | 400-407 (KY) |
| 433-439 (LA) | 010-034 (MA) | 212-220 (MD) |
| 004-007 (ME) | 362-386 (MI) | 468-477 (MN) |
| 486-500 (MO) | 425-428 (MS) | 587 (MS) |
| 516-517 (MT) | 237-246 (NC) | 501-502 (ND) |
| 505-508 (NE) | 001-003 (NH) | 135-158 (NJ) |
| 585 (NM) | 530 (NV) | 050-134 (NY) |
| 268-302 (OH) | 440-448 (OK) | 540-544 (OR) |
| 159-211 (PA) | 581-584 (PR) | 035-039 (RI) |
| 247-251 (SC) | 503-504 (SD) | 408-415 (TN) |
| 449-467 (TX) | 528-529 (UT) | 223-231 (VA) |
| 008-009 (VT) | 531-539 (WA) | 387-399 (WI) |
| 232 (WV, NC) | 233-236 (WV) | 520 (WY) |
580 (Vir. Is.; PR) | ||
586 (Guam, Am. Samoa, Phil. Islands) | ||
700-728 (RR Retirement Board - All States) | ||
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