[metadat]

Intriguing, I just checked mine and it seems California doesn't appear to do this.

If you're comfortable sharing, would like to find out which state you're referring to. Cheers.

[ComputerGuru]

Another poster shared this link: http://www.highprogrammer.com/alan/numbers/dl_us_shared.html

It has the encoding formula for Wisconsin, Illinois, and Florida (which match the parent's comment) but there may be others.

[michaelcampbell]

Mine was Illinois. I got it in the early 1980's, and moved away shortly thereafter, so no idea if they still do.

Weirdly, I remember that # even now. Soundex-???-2DigitYearOfBirth-???

Looks like at least the format has changed since then.