I think the state codings are shown at http://www.whs.mil/library/mildoc/AR%20601-49,%201%20June%201964.pdf.
I have the Google cache for that and it says the codes are:
4 California
16 Louisiana
28 Missouri, New Jersey, Mexico (only case of mulitple states same code???)
45 Washington State
49 DC
52 Hawaii
There’s no 23 listed. Somewhat confusing, but it is an Army document.
I’m getting a network error trying to open that document.
Never mind. I gave the internet a few swift kicks and the doc is now opened.
There are some emphases in page two of that document about how important the spacing is in a SSS#. So, that makes it stranger that if the ALLEGED SSS Public Service Specialist sent that number to Bob Owens (blogger) that he wouldn’t use the correct format.