Decoding Social Security Numbers in One Step

Stephen P. Morse, San Francisco

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Three-Digit Decoder

SSN starting with	- XX - XXXX
was issued in

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Five-Digit Decoder

SSN starting with	- - XXXX
was issued in

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Three-Digit Assignment Chart

0xx, 1xx	2xx, 3xx	4xx	5xx	5xx	6xx	7xx	8xx, 9xx
001-003 NH	212-220 MD	400-407 KY	501-502 ND	540-544 OR	600-601 AZ	700-728 RR*	800-999 XX*
004-007 ME	221-222 DE	408-415 TN	503-504 SD	545-573 CA	602-626 CA	729-733 EE*
008-009 VT	223-231 VA	416-424 AL	505-508 NE	574-574 AK	627-645 TX	734-749 XX*
010-034 MA	232-232 NW*	425-428 MS	509-515 KS	575-576 HI	646-647 UT	750-751 HI
035-039 RI	233-236 WV	429-432 AR	516-517 MT	577-579 DC	648-649 NM	752-755 MS
040-049 CT	237-246 NC	433-439 LA	518-519 ID	580-580 VI	650-653 CO	756-763 TN
050-134 NY	247-251 SC	440-448 OK	520-520 WY	581-584 PR	654-658 SC	764-765 AZ
135-158 NJ	252-260 GA	449-467 TX	521-524 CO	585-585 NM	659-665 LA	766-772 FL
159-211 PA	261-267 FL	468-477 MN	525-525 NM	586-586 PI*	666-666 XX*	773-799 XX*
	268-302 OH	478-485 IA	526-527 AZ	587-588 MS	667-675 GA
	303-317 IN	486-500 MO	528-529 UT	589-595 FL	676-679 AR
	318-361 IL		530-530 NV	596-599 PR	680-680 NV
	362-386 MI		531-539 WA		681-690 NC
	387-399 WI				691-699 VA

NW* = North Carolina if next two digits are 30, otherwise West Virginia

PI* = Pacific Islands (Guam, American Samoa, Northern Mariana Islands, Philipines)

RR* = Railroad Workers

EE* = Enumeration at Entry

XX* = Unassigned

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The structure of Social Security Numbers can be found in Jerry Crow and Barbara Bennett's article .
Later number assignments can be found at the Social Security Administration website
This page is automatically updated monthly

© Stephen P. Morse, 2007