I have looked through all the state documentation as well as the TurboTax support data base, and I don't see what happens if you can't supply the SSN. I suggest that you try to file with the field blank, and hopefully the State will accept it.
Note: if there is an e-file reject by Colorado, you have the option of printing and mailing - the e-file checks sometimes have no sense of humor. But I would try to e-file with the field blank; if the State does not like it, they will send you a letter, and you can explain to them why you would need a court order at least to get such confidential information.
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